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Irrigation and Nitrogen Management Determine Dry Matter Accumulation and Yield of Winter Wheat Under Dryland Conditions 灌溉和氮肥管理决定旱地条件下冬小麦的干物质积累和产量
IF 3.7 2区 农林科学 Q1 AGRONOMY Pub Date : 2024-08-20 DOI: 10.1111/jac.12745
Lijuan Ma, Muhammad Fraz Ali, Yulan Ye, Xiaohu Huang, Zili Peng, Muhammad Asad Naseer, Rui Wang, Dong Wang

The increase in crop yield can be primarily attributed to the combined effect of genetic advancements, as well as increased contributions from nitrogen (N) and water. The accumulation of dry matter plays a crucial role in determining grain yield in winter wheat. The current study aimed to better understand the source-sink dynamics, analyse the dry matter transport (DMT) before and after anthesis and calculate its ratio to grain yield. In this experiment, eight main cultivars of winter wheat that have been widely cultivated in Shaanxi Province since the 1940s were selected as planting material. Field examinations were conducted using three levels of both irrigation and N. The yield-related parameters, dry matter accumulation, dry matter distribution, DMT and DMT efficiency were measured. The results showed that irrigation prolonged the time of dry matter accumulation, and the application of N fertiliser increased the rate of dry matter accumulation. The analysis of the dynamic characteristic parameters of dry matter in winter wheat showed that irrigation and N had a significant impact on rate of dry matter accumulation. The proportion of stems, leaves and spikes of new varieties increased significantly (p < 0.05), which increased by 56.67%–69.7%, 13.26%–18.07% and 15.78%–28.26%, respectively, with the varietal improvement. The DMT efficiency increased with varietal improvement and also with increased irrigation and N application. The response of irrigation treatment to DMT and dry matter was more significant. In addition, the irrigation treatment had a higher effect on the DMT efficiency of vegetative organs after anthesis. The logistic equation analysis revealed that water stress accelerated the fulfilment of maximum daily temperature (Tmax), while both the maximum growth rate (Gmax) and dry matter weight (Wmax) decreased as water stress increased. There was a positive linear relationship between dry matter accumulation after anthesis and grain yield. The structural equation model showed that varieties, N application and irrigation had significant positive effects on DMT, post-anthesis dry matter and grain yield, while irrigation had significant negative effects on DMT efficiency. The accumulation of dry matter in winter wheat after anthesis showed a significant increase with the succession of varieties. The combination of moderate deficit irrigation and fertilisation improved transportation and dry matter accumulation after anthesis in winter wheat, thereby enhancing its production capacity.

作物产量的提高主要归功于基因进步以及氮(N)和水贡献增加的综合效应。干物质的积累在决定冬小麦谷物产量方面起着至关重要的作用。目前的研究旨在更好地了解源汇动态,分析开花前后的干物质运输(DMT),并计算其与谷物产量的比率。本试验选择了陕西省自 20 世纪 40 年代以来广泛种植的 8 个主要冬小麦品种作为种植材料。对产量相关参数、干物质积累、干物质分布、DMT 和 DMT 效率进行了测定。结果表明,灌溉延长了干物质积累的时间,施用氮肥提高了干物质积累的速度。对冬小麦干物质动态特征参数的分析表明,灌溉和氮对干物质积累率有显著影响。随着品种改良,新品种的茎、叶、穗比例显著增加(p < 0.05),分别增加了 56.67%-69.7%、13.26%-18.07% 和 15.78%-28.26%。DMT 效率随品种改良而提高,也随灌溉和氮施用量的增加而提高。灌溉处理对 DMT 和干物质的响应更为显著。此外,灌溉处理对开花后无性器官的 DMT 效率影响更大。对数方程分析表明,水分胁迫会加速最高日温(Tmax)的达到,而随着水分胁迫的增加,最高生长速率(Gmax)和干物质重量(Wmax)都会降低。花后干物质积累与谷物产量之间呈正线性关系。结构方程模型显示,品种、氮施用量和灌溉对 DMT、花后干物质和谷物产量有显著的正效应,而灌溉对 DMT 效率有显著的负效应。冬小麦花后干物质的积累随品种的演替而显著增加。适度亏缺灌溉与施肥相结合可改善冬小麦的运输和花后干物质积累,从而提高其生产能力。
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引用次数: 0
Enhancing Soil Resilience and Sugar Beet (Beta vulgaris L.) Yield: Mid-Term Effects of Compost and Glauconite Integration 提高土壤韧性和甜菜产量:堆肥与褐藻土结合的中期效果
IF 3.7 2区 农林科学 Q1 AGRONOMY Pub Date : 2024-08-11 DOI: 10.1111/jac.12747
Mahmoud M. A. Shabana, Arwa Abdulkreem AL-Huqail, Hitham E. A. Nemeat Alla, Ahmed M. S. Kheir, Mahmoud El-Sharkawy

Sugar beet (Beta vulgaris L.) is a globally significant crop, valued for its economic importance in sugar production. Saline-sodic soil environments negatively impact sugar beet productivity. This study investigates the effects of using compost, glauconite enriched-K and their combinations in mitigating the saline-sodic soil environment, sugar beet productivity and extracted sugar quality. A two-season field experiment in split-plot design with the main plots is three doses of compost: control (C0), recommended (100%) dose (C1) and 150% recommended dose (C2). Each group divided into four subplots of glauconite treatments arranged according to the recommended dose of potassium (K) as follows: G0 (no glauconite), G1 (50% K), G2 (100% K, 480 Kg glauconite Fed−1) and G3 (150% K). The results showed that compost and glauconite mitigated adverse soil effects caused by salinity and sodicity. The C2G3 treatment reduced electrical conductivity (EC) and exchangeable sodium percentage (ESP), improved organic matter and enhanced soil bulk density, porosity and penetration resistance. This combination also increased soil nutrients (N, K, Fe, Mn, Zn and Cu). Regarding the sugar beet yield, C2G3 improved root yield, top yield, sugar yield and extracted sugar. The application of glauconite increased root diameter by 20% and root length by 23%, enhanced sugar quality with minimal sugar losses to molasses (2.43%), and reduced impurities of K, α-amino N and Na. Principal component analysis showed positive correlations between root yield and soil potassium, organic matter, cation exchange capacity and soil porosity, with negative correlations to bulk density, EC, pH and ESP. Two-way analysis of main (ANOM) illustrated significant effects of compost and glauconite on soil–plant interactions. Multivariate analysis indicated that higher glauconite doses significantly enhanced root yield. The Gag run charts confirmed that compost (100%) and G3 levels explored more homogeneity reducing the ESP%, increasing sugar beet root yield, sugar yield and quality.

甜菜(Beta vulgaris L.)是一种具有全球意义的作物,在制糖业中具有重要的经济价值。盐碱化的土壤环境对甜菜的产量有负面影响。本研究调查了使用堆肥、高芒硝富集-K 及其组合对缓解盐碱土壤环境、甜菜生产率和榨糖质量的影响。两季田间试验采用分小区设计,主小区有三种堆肥剂量:对照(C0)、推荐剂量(100%)(C1)和推荐剂量(150%)(C2)。根据钾(K)的推荐剂量,每组又分为以下四个芒硝处理子小区:G0(无芒硝)、G1(50%钾)、G2(100%钾,480 千克芒硝Fed-1)和 G3(150%钾)。结果表明,堆肥和芒硝减轻了盐碱化对土壤的不利影响。C2G3 处理降低了导电率(EC)和可交换钠百分比(ESP),改善了有机质,提高了土壤容重、孔隙度和抗渗透性。这一组合还增加了土壤养分(氮、钾、铁、锰、锌和铜)。在甜菜产量方面,C2G3 提高了根产量、顶端产量、糖产量和提取的糖分。施用芒硝后,根的直径增加了 20%,根的长度增加了 23%,提高了糖的质量,糖蜜中糖的损失最小(2.43%),并减少了 K、α-氨基氮和 Na 的杂质。主成分分析表明,根产量与土壤钾、有机质、阳离子交换容量和土壤孔隙度呈正相关,与容重、EC 值、pH 值和 ESP 值呈负相关。双向主分析(ANOM)表明,堆肥和芒硝对土壤-植物相互作用有显著影响。多变量分析表明,芒硝剂量越大,根系产量越高。Gag run 图表证实,堆肥(100%)和 G3 水平可降低 ESP%,提高甜菜根产量、糖产量和质量。
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引用次数: 0
Identifying Genetic Loci Determining Grain Yield Under Drought Stress in Rice (Oryza sativa L.) 鉴定决定水稻(Oryza sativa L.)干旱胁迫下谷粒产量的遗传位点
IF 3.7 2区 农林科学 Q1 AGRONOMY Pub Date : 2024-08-09 DOI: 10.1111/jac.12743
Helan Baby Thomas, Satish Verulkar, Toshi Agarwal, Ritu Saxena, Sunil Kumar Verma

Identifying the genomic regions (quantitative trait loci (QTL)) significantly linked to grain yield under drought stress could expedite the development of novel rice cultivars suited for rainfed areas through marker-assisted breeding. This study identified QTL regions linked to plant phenology and production traits by evaluating 122 recombinant inbred lines (RILs) of Danteshwari × Daggaddeshi under different environmental conditions. A consistent QTL region associated with grain yield under water stress (60.4 Mbp) was mapped on chromosome 1 between RM428 and RM24 with an LOD score of 4.0. Another QTL region (9.4 Mbp) linked to plant height under all environmental conditions was mapped on chromosome 1 between RM1-HvSSR1-87 with a LOD score of 7.5 and phenotypic variance of 25%. A core set of 402 diverse rice accessions was also evaluated under water stress conditions and subjected to genome-wide association analysis. Twelve markers linked to grain yield under drought were identified, out of which five were significantly associated with grain yield and days to flowering under drought. The markers linked to grain yield were compared between the bi-parental population and germplasm accessions to identify the common markers. Three markers (RM1, RM259 and RM201) were found to be consistently linked to drought stress across the seasons in both bi-parental population and germplasm accessions studied and could be potential candidates for application in marker-assisted selection for improving grain yield under drought stress in rice.

通过标记辅助育种,确定与干旱胁迫下谷物产量显著相关的基因组区域(数量性状位点(QTL))可加快开发适合雨水灌溉地区的新型水稻栽培品种。本研究通过在不同环境条件下评估 122 个 Danteshwari × Daggaddeshi 的重组近交系(RIL),确定了与植物物候和产量性状相关的 QTL 区域。在 RM428 和 RM24 之间的 1 号染色体上绘制了一个与水分胁迫下谷物产量相关的一致 QTL 区域(60.4 Mbp),LOD 得分为 4.0。另一个与所有环境条件下株高相关的 QTL 区域(9.4 Mbp)被绘制在 RM1-HvSSR1-87 之间的 1 号染色体上,LOD 得分为 7.5,表型方差为 25%。在水分胁迫条件下,还对 402 个不同水稻品种的核心组进行了评估,并进行了全基因组关联分析。鉴定了 12 个与干旱条件下谷物产量相关的标记,其中 5 个与干旱条件下谷物产量和开花天数显著相关。在双亲群体和种质登录之间比较了与谷物产量相关的标记,以确定共同标记。研究发现,在所研究的双亲群体和种质材料中,有三个标记(RM1、RM259 和 RM201)在不同季节与干旱胁迫有一致的联系,可作为潜在的候选标记应用于标记辅助选择,以提高水稻在干旱胁迫下的产量。
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引用次数: 0
Maize Responses to High Night Temperature During Postflowering and Early Grain Filling: Effects on Yield Components, Kernel Growth and Dry Matter Allocation 玉米在开花后和籽粒灌浆初期对夜间高温的反应:对产量成分、籽粒生长和干物质分配的影响
IF 3.7 2区 农林科学 Q1 AGRONOMY Pub Date : 2024-08-05 DOI: 10.1111/jac.12741
Belén Araceli Kettler, Constanza Soledad Carrera, Federico David Nalli Sonzogni, Fernando Héctor Andrade, Nicolás Neiff

Warm night frequency has increased steadily in the last years across maize production regions, but high night temperature (HNT) effects on growth, grain yield and maize dry matter allocation (DMA) to different plant organs remain poorly understood. In this study, we aimed to (i) analyse the DMA among reproductive and vegetative organs, (ii) evaluate the individual kernel weight through its determinants, rate and duration of grain filling and (iii) quantify changes in grain yield per plant and its components due to HNT during the postflowering and early grain-filling period. Field-grown maize was subjected to HNT induced by shelters during a 15- or 30-day period after silking, encompassing the postflowering period (HNT15) and extending the heating into early grain filling (HNT30), respectively. The HNT was applied from 1900 to 0700 h while control plots remained at ambient night temperature (ANT). Kernel number per plant was decreased under both temperature regimes (i.e., HNT15 and HNT30); however, significant reductions in grain yield were only observed under HNT30. The DMA during the heating period was differentially affected by the duration of heating. While DMA to the stem was likewise reduced by both heating treatments, the partition to the uppermost ear was only reduced under HNT30. Related to the lack of response to HNT treatments of the rate and duration of grain filling, the individual kernel weight was not reduced. The source-sink ratio was not affected by HNT, meanwhile, the apparent reserve use was significantly reduced under HNT30. Our results demonstrate that the magnitude of HNT effects is subjected to the duration of the heating period, but also depends on the intensity of heating explored across seasons, especially for kernel number and grain yield.

过去几年中,玉米产区的暖夜频率稳步上升,但人们对高夜温(HNT)对生长、谷物产量和不同植物器官的玉米干物质分配(DMA)的影响仍然知之甚少。在这项研究中,我们的目标是:(i) 分析生殖器官和无性器官之间的干物质分配;(ii) 通过籽粒灌浆的决定因素、速度和持续时间评估单粒重量;(iii) 量化开花后和籽粒灌浆初期 HNT 对单株籽粒产量及其组成部分的影响。田间种植的玉米在抽丝后 15 天或 30 天内分别受到棚架诱导的 HNT,包括开花后时期(HNT15)和延长到谷粒灌浆初期(HNT30)的加热。HNT 从 1900 时至 0700 时进行,而对照小区则保持夜间环境温度 (ANT)。在两种温度条件下(即 HNT15 和 HNT30),每株的籽粒数都有所减少;但只有在 HNT30 条件下,籽粒产量才会显著降低。加热期间的 DMA 受加热持续时间的影响不同。虽然两种加热处理都会减少茎干的 DMA,但只有在 HNT30 条件下,最上层穗的 DMA 才会减少。由于 HNT 处理对谷粒灌浆速度和持续时间没有影响,因此单粒重量也没有减少。源-汇比率没有受到 HNT 的影响,而在 HNT30 条件下,表观储备利用率显著降低。我们的研究结果表明,HNT 的影响程度不仅取决于加热时间的长短,还取决于不同季节的加热强度,尤其是对籽粒数和谷粒产量的影响。
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引用次数: 0
Enhancing Peanut (Arachis hypogaea) Productivity and Biochemical Traits: A Comparison of Straw Mulch and Polythene Mulch Under Prolonged Salinity Stress 提高花生(Arachis hypogaea)的生产力和生化性状:长期盐度胁迫下秸秆覆盖物与聚乙烯覆盖物的比较
IF 3.7 2区 农林科学 Q1 AGRONOMY Pub Date : 2024-08-05 DOI: 10.1111/jac.12739
H. N. Meena, B. C. Ajay, K. K. Reddy, M. D. Meena, J. P. Mishra

The escalating population growth has spurred a demand for increased oilseed production, necessitating urgent attention. However, the expansion of saline-affected regions posed a significant obstacle to maintain peanut productivity in these areas. Thus, to tackle the productivity decline in saline-affected regions, we investigated whether substituting polythene mulch with straw mulch, as part of an agronomic management strategy, could mitigate the rapid decrease in peanut productivity. Three mulching methods (control, polythene mulch and straw mulch) were employed to cultivate the crop (cv. TG 37A) under salinity levels of 0.5, 2, 4 and 6 dS m−1. As salinity levels increased, there was a notable decrease in germination percentage, growth, yield and biochemical characteristics, including pod and haulm yields were reported. Despite salinity reduced free amino acids and oil content, it exhibited significant increase in protein and sugar content. Saline irrigation water led to a reduction in pod yield, haulm yield and oil content by 24.67%, 23.84% and 5.07%, respectively, at a salinity level of 6.0 dS m−1 compared to the control with 0.5 dS m−1 salinity. Moreover, straw mulching resulted in a boost in pod yield, haulm yield and oil content by 30.09%, 4.83% and 1.75%, respectively, compared to the control. The reduction in pod yield and oil content under the interaction of mulching and salinity was 46.44% and 6.87% at M0S6, 21.42% and 4.44% at M1S6, and 7.55% and 3.87% at M2S6 compared to M0S0, M1S0 and M2S0, respectively. A similar trend was also observed in 100-pod weight, 100-kernel weight and shelling percentage. Accordingly, it was concluded that the declining trend in all attributes under straw mulching at various salinity levels surpassed polythene mulching, ensuring superior peanut production under salinity stress conditions.

人口的不断增长刺激了对油籽增产的需求,因此亟需关注。然而,受盐碱影响地区的扩大对维持这些地区的花生产量构成了重大障碍。因此,为了解决受盐碱影响地区生产率下降的问题,我们研究了作为农艺管理策略的一部分,用秸秆覆盖物替代聚乙烯覆盖物能否缓解花生生产率的快速下降。在盐度为 0.5、2、4 和 6 dS m-1 的条件下,采用了三种地膜覆盖方法(对照、聚乙烯地膜覆盖和稻草地膜覆盖)栽培作物(TG 37A)。随着盐度水平的增加,发芽率、生长、产量和生化特性(包括豆荚和茎秆产量)都明显下降。尽管盐度降低了游离氨基酸和油含量,但蛋白质和糖含量却显著增加。与盐度为 0.5 dS m-1 的对照相比,盐度为 6.0 dS m-1 时,盐水灌溉导致豆荚产量、茎秆产量和含油量分别减少了 24.67%、23.84% 和 5.07%。此外,与对照相比,稻草覆盖使豆荚产量、茎秆产量和含油量分别提高了 30.09%、4.83% 和 1.75%。与 M0S0、M1S0 和 M2S0 相比,在地膜覆盖和盐度的交互作用下,M0S6 的豆荚产量和含油量分别减少了 46.44% 和 6.87%,M1S6 减少了 21.42% 和 4.44%,M2S6 减少了 7.55% 和 3.87%。在百荚重、百粒重和脱壳率方面也观察到类似的趋势。因此,得出的结论是,在不同盐度水平下,稻草覆盖所有属性的下降趋势都超过了聚乙烯覆盖,从而确保了花生在盐度胁迫条件下的优异产量。
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引用次数: 0
Silicate Application Alleviated the Depressive Impacts of Nighttime Warming on the Rice Growth, Yield and Quality in Southern China 施用硅酸盐可缓解夜间增温对中国南方水稻生长、产量和品质的抑制作用
IF 3.7 2区 农林科学 Q1 AGRONOMY Pub Date : 2024-07-25 DOI: 10.1111/jac.12742
Yunsheng Lou, Yan Liu, Defeng Pan, Junhong Guo, Huilin Yang, Dongxue Zhou, Lixuan Ren

Nighttime warming decreased single rice production in southern China, while silicate supply increased the yield and stress resistance. It is still unclear regarding the impacts of silicate application on the growth, yield and quality in rice under nighttime warming. A field experiment was conducted to investigate the impacts of silicate application on the growth, yield and quality during rice growing period under nighttime warming. The warming was set at two levels, that is, ambient temperature (CK) and nighttime warming (NW). The open passive nighttime warming was used in this study, that is, rice canopy was covered with aluminium foil reflective film at night (19:00–6:00). Silicate fertiliser (steel slag) was applied at two levels, that is, Si0 (0 kg SiO2·hm−2) and Si1 (200 kg SiO2·hm−2). The results indicated that, compared with the control, the average nighttime temperature on rice canopy and at 5 cm soil layer increased by 0.51°C–0.59°C and 0.28°C–0.41°C during the rice growing period, respectively. Under nighttime warming, silicate supply increased the dry weight of shoot, total dry weight of the whole plant and yield by 64.1%, 55.3% and 7.1% at the filling-maturity stage, respectively. Silicate application significantly reduced dry matter translocation rate with 15%–18%, but significantly increased the root-shoot ratio with 0.39–0.41 in rice. Under nighttime warming, silicate supply significantly increased milled rice rate, head rice rate and total starch content by 2.3%, 2.5% and 41.8%, respectively. Nighttime warming reduced the yield by decreasing the number of effective panicle, seed setting rate and 1000-grain weight, but increasing empty chaff grain. Silicate supply increased the yield by increasing the number of effective panicle, filled grains per panicle, seed setting rate and 1000-grain weight, but reducing empty chaff grain. This study suggests that silicate supply can effectively alleviate the suppressive effects of nighttime warming on single rice growth, yield and quality in Southern China.

夜间增温降低了中国南方水稻的单产,而施用硅酸盐则提高了产量和抗逆性。施用硅酸盐对夜温条件下水稻生长、产量和品质的影响尚不清楚。本研究进行了一项田间试验,以研究在夜间增温条件下施用硅酸盐对水稻生长期的生长、产量和品质的影响。加温设置为两个水平,即环境温度(CK)和夜间加温(NW)。本研究采用开放式被动夜间增温,即在夜间(19:00-6:00)用铝箔反光膜覆盖水稻冠层。硅酸盐肥料(钢渣)的施用量分为两个等级,即 Si0(0 kg SiO2-hm-2)和 Si1(200 kg SiO2-hm-2)。结果表明,与对照相比,在水稻生长期间,水稻冠层和 5 厘米土层的夜间平均温度分别升高了 0.51°C-0.59°C 和 0.28°C-0.41°C。在夜间增温条件下,施用硅酸盐可使灌浆成熟期的嫩梢干重、全株干重和产量分别增加 64.1%、55.3% 和 7.1%。施用硅酸盐会明显降低水稻的干物质转移率(15%-18%),但会明显提高根芽比(0.39-0.41)。在夜间增温条件下,施用硅酸盐可显著提高碾米率、头米率和总淀粉含量,增幅分别为 2.3%、2.5% 和 41.8%。夜间增温降低了有效穗数、结实率和千粒重,但增加了空糠粒,从而降低了产量。供应硅酸盐可增加有效圆锥花序数、每圆锥花序的饱满粒数、结实率和千粒重,但会减少空糠粒,从而提高产量。这项研究表明,供应硅酸盐可有效缓解夜间增温对中国南方单季稻生长、产量和品质的抑制作用。
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引用次数: 0
Waterlogging-Induced Changes in ABA, Carbohydrates and CBF6 Modify Freezing Tolerance in Prehardened Festuca pratensis 水涝引起的 ABA、碳水化合物和 CBF6 变化改变了预硬苗的耐冻能力
IF 3.7 2区 农林科学 Q1 AGRONOMY Pub Date : 2024-07-24 DOI: 10.1111/jac.12740
Barbara Jurczyk, Michał Dziurka, Franciszek Janowiak, Ewa Pociecha, Maciej Grzesiak, Marcin Rapacz

Changes in precipitation and snow melt during warmer winters can increase low-temperature waterlogging. Such conditions may bring about different effects when compared with a single stress trigger, such as low-temperature or water excess. The effects of waterlogging are clearly related to water temperature, and the consequences of water excess might be less severe, as more oxygen is dissolved in colder water. The effect of waterlogging during cold acclimation (CA) is poorly understood; most experiments concerning water excess are performed at relatively high-temperatures. In this study, we examined the effect of 3 weeks of waterlogging (approx. 2 cm above the soil level) on CA in Festuca pratensis Huds. (Fp), a cool-season grass. Measurements were taken before CA (after prehardening, before flooding) and after 3 weeks of CA in waterlogged (treated) and non-waterlogged (control) plants. The work included: (i) freezing tolerance test (regrowth after freezing), (ii) analysis of abscisic acid (ABA) content in the leaf, (iii) leaf stomatal conductance, (iv) leaf water content, (v) carbohydrates analysis, including fructans, and (vi) transcript levels of selected genes involved in freezing tolerance, ABA signalling and fructan biosynthesis. The aim of the study was to test a hypothesis that low-temperature waterlogging in Fp enhances freezing tolerance (plant regrowth after freezing) related to increased ABA accumulation, increased C-repeat-binding transcription factor expression and/or increased carbohydrate accumulation, including fructans. Two out of four genotypes exhibited enhanced regrowth following freezing due to waterlogging relative to control. Principal component analysis (PCA) revealed a positive correlation between ABA levels and freezing tolerance in both treatments, with a more pronounced effect observed in the waterlogged plants. However, the phytohormone played different roles in these two treatments. In the context of low-temperature waterlogging, ABA may be involved in the dehydration tolerance response in genotypes suffering from physiological drought, as well as the induction of C-repeat-binding transcription factors (CBFs) and sucrose, which may improve freezing tolerance. The increased fructan amount and polymerisation degree due to waterlogging may provide a carbohydrate sink to maintain a high photosynthetic efficiency, but are not directly responsible for freezing tolerance changes. The study indicates that tolerance mechanisms of Fp exposed to low-temperature waterlogging involve maintaining a high photosynthetic rate, as well as oxidative and dehydration stress tolerance.

冬季变暖时降水和融雪的变化会加剧低温涝害。与低温或水量过多等单一压力触发因素相比,这些条件可能会带来不同的影响。水涝的影响显然与水温有关,而水量过多的后果可能没那么严重,因为较冷的水中溶解了更多的氧气。人们对低温适应(CA)过程中水涝的影响知之甚少;大多数有关水过量的实验都是在相对较高的温度下进行的。在这项研究中,我们考察了涝害 3 周(高出土壤水平约 2 厘米)对 Festuca pratensis Huds.(Fp)(一种冷季型草坪草)CA 的影响。在 CA 之前(预硬化后,淹水前)和 CA 3 周后,分别对水涝(处理)和非水涝(对照)植物进行了测量。工作包括(i)耐冻性测试(受冻后重新生长),(ii)叶片中脱落酸(ABA)含量分析,(iii)叶片气孔导度,(iv)叶片含水量,(v)碳水化合物分析,包括果聚糖,以及(vi)参与耐冻性、ABA 信号传导和果聚糖生物合成的选定基因的转录水平。该研究旨在验证一个假设,即 Fp 的低温涝害会增强耐冻性(植物受冻后重新生长),这与 ABA 积累增加、C-重复结合转录因子表达增加和/或碳水化合物(包括果聚糖)积累增加有关。与对照组相比,四种基因型中有两种在受冻后由于涝害表现出更强的再生能力。主成分分析(PCA)显示,在两种处理中,ABA 水平与耐冻性之间存在正相关,在受涝植株中观察到的影响更为明显。不过,植物激素在这两种处理中的作用不同。在低温涝害的情况下,ABA 可能参与了生理干旱基因型的脱水耐受反应,也可能诱导了 C 重复结合转录因子(CBFs)和蔗糖,从而提高了抗冻性。涝害导致的果聚糖数量和聚合度增加可能为维持高光合效率提供了碳水化合物汇,但并不是耐冻性变化的直接原因。该研究表明,Fp 对低温涝害的耐受机制包括维持高光合速率以及耐氧化和脱水胁迫。
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引用次数: 0
Low Light at Specific Growth Stage Affects Photoassimilates Transportation, Seed Quality and Yield in Brassica napus L. 特定生长阶段的弱光影响油菜光同化物的运输、种子质量和产量
IF 3.7 2区 农林科学 Q1 AGRONOMY Pub Date : 2024-07-20 DOI: 10.1111/jac.12735
Hafiz Hassan Javed, Yue Hu, Ali Raza, Nadiyah M. Alabdallah, Muhammad Ahsan Asghar, Khurram Shehzad Khan, Xiao Peng, Abu Zar Ghafoor, Abd Ullah, Yong-Cheng Wu

In many parts of the world, solar radiation has decreased during the past 50 years due to industrialisation-induced elevations in air aerosols which has negatively impacted crop productivity. Climate change threatens rapeseed (Brassica napus L.) production due to shade stress caused by reduced light radiation. However, studies on how shade affects photosynthetic mechanisms in rapeseed (leaves and pod wall) are not well documented. Understanding the mechanisms of shade on yield formation in rapeseed is important for breeding shade-tolerant rapeseed varieties and optimising agricultural management practices in low-light areas. Therefore, this study assesses the impacts of ‘global dimming’ simulated by shading at a specific period on rapeseed's photosynthetic behaviour, yield and seed quality. A two-factor split-plot design was arranged with three shading treatments (CK, FS and PS) and two hybrid genotypes (Chuannong and Zhongyouza) of rapeseed. We observed that shading at the flowering stage (FS) significantly inhibited the leaf area index, chlorophyll content, photosynthetic efficiency and enzymatic activities of both genotypes. Besides that, shading at pod development stage (PS) substantially declined the pod photosynthetic characteristics and transportation of carbohydrates towards economic organ (seeds) which directly decreased the yield of rapeseed. We found that PS treatment remarkably declined the oil content of both genotypes. According to the results, the photosynthetic capacity of rapeseed pod wall had a greater impact on yield and seed quality than leaves. Therefore, improving the photosynthetic capacity and material transport efficiency of the pod wall is a potential measure to increase the yield of rapeseed under shade stress. This study provides a new insight into the effects of shade on rapeseed production and provides a valuable reference for rapeseed breeding techniques to develop high-yielding genotypes by enhancing the photosynthetic efficiency of rapeseed pod wall in low-light conditions.

在过去 50 年中,由于工业化导致空气中气溶胶增加,世界许多地区的太阳辐射减少,对作物产量产生了负面影响。由于光辐射减少导致的遮荫胁迫,气候变化威胁着油菜籽(Brassica napus L.)的生产。然而,有关遮荫如何影响油菜籽(叶片和豆荚壁)光合作用机制的研究还没有很好的记录。了解遮荫对油菜籽产量形成的影响机制,对于培育耐荫油菜品种和优化低光照地区的农业管理措施非常重要。因此,本研究评估了特定时期遮光模拟的 "全球变暗 "对油菜光合作用行为、产量和种子质量的影响。研究采用双因素小区设计,安排了三种遮光处理(CK、FS 和 PS)和两种油菜杂交基因型(川农和中油菜)。我们观察到,花期遮光(FS)明显抑制了两种基因型的叶面积指数、叶绿素含量、光合效率和酶活性。此外,豆荚发育期(PS)的遮光处理大大降低了豆荚的光合特性和碳水化合物向经济器官(种子)的运输,直接降低了油菜籽的产量。我们发现,PS 处理显著降低了两种基因型的含油量。结果表明,与叶片相比,油菜荚壁的光合能力对产量和种子质量的影响更大。因此,提高荚壁的光合能力和物质运输效率是提高遮荫胁迫下油菜产量的潜在措施。该研究对遮荫对油菜籽产量的影响有了新的认识,为油菜育种技术提供了有价值的参考,通过提高低光照条件下油菜荚壁的光合效率,培育高产基因型。
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引用次数: 0
Cross-Generational Effect of Water Deficit Priming on Physiology of Peanut Plants Under Water Stress 缺水引物对水分胁迫下花生植株生理机能的跨代影响
IF 3.7 2区 农林科学 Q1 AGRONOMY Pub Date : 2024-07-19 DOI: 10.1111/jac.12736
Aline de Camargo Santos, Bruce Schaffer, Diane Rowland, Matthew Bremgartner, Pamela Moon, Barry Tillman, Edivan Rodrigues de Souza, Elias Bassil

Water deficit priming through regulated deficit irrigation has been shown to be beneficial for peanut cultivation, leading to improved water-use efficiency during the crop cycle and enhanced stress acclimation. The effects of priming using water deficit can be heritable, but little is known about stress priming effects on the physiology and growth of successive generations undergoing water stress. Two experiments were conducted to assess cross-generational priming by determining physiological and growth responses of offspring of primed and non-primed peanut plants of two genotypes, COC-041 and New Mexico Valencia C (NMV-C), both previously found to be strongly responsive to priming. Seeds were collected from parental plants subjected to mild water stress by regulated deficit irrigation (primed) or adequate irrigation (non-primed). These seeds were then planted, and the offspring were monitored for physiological and growth responses to water stress, including on a whole-plant basis using a high-throughput physiological phenotyping platform and on individual leaves by periodic single-leaf measurements. Measurements included whole-plant transpiration (plant-Tr), root water uptake, leaf transpiration, stomatal conductance and net CO2 assimilation (leaf-Tr, leaf-gs, and leaf-A), leaf water and osmotic potential (leaf-Ψw and leaf-Ψo), leaf osmotic adjustment, leaf relative water content (leaf-RWC) and cumulative plant-Tr. Offspring of both genotypes from primed parent plants had faster early establishment, with more uniform germination, and more rapid initial seedling growth compared to offspring from non-primed parent plants. Although offspring of both non-primed and primed plants of both genotypes exhibited a significant reduction of plant-Tr, gas exchange, leaf-Ψw, leaf-Ψo, and leaf-RWC when exposed to water stress, offspring of primed plants showed increased water use efficiency through reduced leaf-gs, leaf-Tr and plant-Tr while maintaining leaf-A under water stress. Despite offspring of both primed and non-primed plants being susceptible to severe water stress, offspring of primed plants exhibited overall enhanced water use efficiency, leading to greater dry biomass production per gram of transpired water and a trend of less growth reduction due to water stress compared to offspring of non-primed plants, especially for the genotype COC-041. This study shows the potential of water deficit priming to promote cross-generational changes in physiological function under limited water availability, by enhancing crop stress acclimation in the next plant generation.

通过调节亏缺灌溉进行亏缺引水已被证明对花生栽培有益,可提高作物周期内的水分利用效率并增强胁迫适应能力。利用水分亏缺诱导的效果可以遗传,但人们对胁迫诱导对遭受水分胁迫的连续世代的生理和生长的影响知之甚少。为了评估跨代引诱,我们进行了两项实验,分别测定两种基因型(COC-041 和新墨西哥瓦伦西亚 C(NMV-C))的引诱和非引诱花生植株后代的生理和生长反应,这两种基因型以前都被发现对引诱有强烈的反应。通过调节亏缺灌溉(启动)或充分灌溉(非启动)对亲本植株施加轻微的水分胁迫,从亲本植株上采集种子。然后种植这些种子,并监测子代对水分胁迫的生理和生长反应,包括使用高通量生理表型平台进行全株监测,以及通过定期单叶测量进行单叶监测。测量包括全株蒸腾(plant-Tr)、根部吸水、叶片蒸腾、气孔导度和二氧化碳净同化(leaf-Tr、leaf-gs 和 leaf-A)、叶片水分和渗透势(leaf-Ψw 和 leaf-Ψo)、叶片渗透调节、叶片相对含水量(leaf-RWC)和累积植株蒸腾。与未经催芽的亲本植株的后代相比,催芽亲本植株的两个基因型的后代早期成苗更快,发芽更均匀,幼苗初期生长更迅速。虽然两种基因型的未引种植株和引种植株的后代在受到水分胁迫时植株-Tr、气体交换、叶片-Ψw、叶片-Ψo和叶片-RWC都显著减少,但引种植株的后代在水分胁迫下通过减少叶片-gs、叶片-Tr和植株-Tr而提高了水分利用效率,同时保持了叶片-A。尽管引种植物和非引种植物的后代都容易受到严重的水分胁迫,但引种植物的后代总体上表现出更高的水分利用效率,与非引种植物的后代相比,引种植物的后代每克转运水产生的干生物量更大,而且因水分胁迫导致的生长下降趋势更小,尤其是基因型 COC-041 的后代。这项研究表明,在有限的水分供应条件下,缺水诱导有可能通过增强下一代植物对作物胁迫的适应性,促进生理功能的跨代变化。
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引用次数: 0
Identifying High-Yielding and Drought-Tolerant Wheat Cultivars Based on Ideotypic Traits and Yield Responses to Stress 根据表型性状和对胁迫的产量反应鉴定高产耐旱小麦品种
IF 3.7 2区 农林科学 Q1 AGRONOMY Pub Date : 2024-07-19 DOI: 10.1111/jac.12738
Yibo Li, Fulu Tao, Yuanfeng Hao, Yonggui Xiao, Zhonghu He, Matthew Reynolds

Drought is one of the most adverse factors affecting plant growth and productivity. Identifying elite genotypes and their ideotypic traits conferring high yield potential and drought tolerance is critical in selecting and breeding drought-tolerant wheat cultivars. In this study, we conducted field experiments at the Xinxiang Agricultural Comprehensive Experimental station in the North China Plain from 2018 to 2020 and assessed 209 wheat cultivars released since the 1940s under irrigated and nonirrigated conditions. Then, we selected drought-tolerant cultivars by classifying them into four groups based on yield response to drought stress and several drought indices. Finally, the key ideotypic traits associated with high yield potential and drought tolerance were identified. Results indicated that the grain yield of the 209 cultivars decreased on average by 10.4% and 9.4% under nonirrigated treatment in 2018–2019 and 2019–2020, respectively, relative to full irrigation. The high-yielding cultivars under both irrigation treatments are characterised by a compact plant type, larger thousand-grain weight, larger chlorophyll content, higher leaf photosynthesis, shorter plant height and stay-green traits. The stomatal and nonstomatal limitations are strongly associated with genotype yield performance, elucidating a potential mechanism underlying drought tolerance. Drought tolerance and yield stability of wheat cultivars have been improved through breeding over the past 70 years. Our findings enhance understanding of drought tolerance and identify genotypes and traits beneficial for breeding high-yielding and drought-tolerant cultivars.

干旱是影响植物生长和生产力的最不利因素之一。鉴定赋予高产潜力和耐旱性的精英基因型及其表型性状对于选育耐旱小麦栽培品种至关重要。在本研究中,我们于2018年至2020年在华北平原的新乡农业综合试验站进行了田间试验,评估了209个自20世纪40年代以来在灌溉和非灌溉条件下发布的小麦栽培品种。然后,根据对干旱胁迫的产量响应和多项干旱指数,将小麦品种分为四组,筛选出耐旱栽培品种。最后,确定了与高产潜力和耐旱性相关的关键表型性状。结果表明,相对于全面灌溉,209 个栽培品种在 2018-2019 年和 2019-2020 年非灌溉处理下的谷物产量分别平均减少了 10.4% 和 9.4%。两种灌溉处理下的高产栽培品种均具有株型紧凑、千粒重较大、叶绿素含量较高、叶片光合作用较强、株高较矮和留绿等特征。气孔和非气孔限制与基因型的产量表现密切相关,阐明了耐旱性的潜在机制。在过去的 70 年中,小麦品种的耐旱性和产量稳定性通过育种得到了提高。我们的研究结果加深了对耐旱性的理解,并确定了有利于培育高产耐旱栽培品种的基因型和性状。
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Journal of Agronomy and Crop Science
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