IF 1.8 4区生物学 Q3 ECOLOGY

Flora

Pub Date : 2025-09-01 DOI: 10.1016/j.flora.2025.152829

Karen Beatriz Hernández-Esquivel , Lourdes Aideé Jiménez-Aparicio , Angel Gabriel Vazquez-Calvo , Anne Damon

Despite the recognized importance of nocturnal pollinators, studies focusing on nocturnally pollinated plants remain limited. Calliandra magdalenae (Fabaceae) is a species that exhibits floral morphology adapted to hawkmoths. The principal aim of this study was to determine the phenological patterns, whether the species reproduces in rural environments, and how climatic conditions influence their floral growth. For two years, the reproductive phenology of C. magdalenae was studied. Flower morphology was assessed using both univariate and multivariate analyses. Floral biology and environmental variables were monitored over 27 days, and their relationships were analyzed. Nocturnal pollinator observations were carried out over five nights. The phenology of C. magdalenae is synchronous among individuals and consists of extended flowering during the wet season and a fruiting period during the dry season. Two distinct floral morphs were documented based on the staminal tube lengths. Increased light is positively correlated with floral bud production, while higher humidity favored floral anthesis. The species exhibits low fruit set rates, possibly due to the low pollination visitation rates and habitat fragmentation. Four hawkmoth species were identified as principal pollinators, each with specific visitation behaviors. Utilizing different pollinators can enhance pollen dispersal. This study demonstrates that plants living in modified landscapes utilize complex strategies to sustain their reproduction.

尽管人们认识到夜间传粉者的重要性，但对夜间传粉植物的研究仍然有限。蚕豆科（Calliandra magdalenae）是一种适合于飞蛾的花形态的植物。本研究的主要目的是确定物候模式，该物种是否在农村环境中繁殖，以及气候条件如何影响其花卉生长。用2年的时间研究了大叶蝉的生殖物候。采用单因素和多因素分析对花的形态进行了评价。在27 d内监测花生物学和环境变量，并分析它们之间的关系。夜间传粉者的观察进行了五个晚上。不同个体间的物候是同步的，包括雨季开花延长和旱季结果期。根据雄蕊管的长度记录了两种不同的花形态。光照的增加与花芽的产生呈正相关，而湿度的增加有利于花的开花。该物种表现出低坐果率，可能是由于低传粉率和栖息地破碎化。四种飞蛾是主要的传粉媒介，每种飞蛾都有特定的访花行为。利用不同的传粉媒介可以促进花粉的传播。本研究表明，在改良景观中生存的植物利用复杂的策略来维持其繁殖。

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引用次数: 0

The equilibrium of nutrition and protection in the interaction between Byrsonima coccolobifolia and Cecidomyiidae 红杉与柞蚕科互作的营养平衡与保护

IF 1.8 4区生物学 Q3 ECOLOGY

Flora

Pub Date : 2025-08-30 DOI: 10.1016/j.flora.2025.152830

Reisila Simone Migliorini Mendes , Elaine Cotrim Costa , Gracielle Pereira Pimenta Bragança , Rosy Mary dos Santos Isaias

Gall induction promotes different modifications in host plant leaf tissues, due to alterations in the number of cell layers, the cell elongation axis, and the accumulation of metabolites. This tissue specialization in gall developmental sites allows the identification of structural and functional compartments. The outer tissue compartment accumulates metabolites with nutritive and protective functions, while the inner tissue compartment accumulates energetic molecules involved in the nutrition of the inducer. Using anatomical, histometric, histochemical, and immunocytochemical techniques, tissue origin and fate were mapped to evaluate the level of investment from each original tissue layer toward the mature gall structure. In the Byrsonima coccolobifolia-Cecidomyiidae system, a balance between the formation of specialized tissues and the accumulation of energetic and defensive molecules was observed. Anatomical, histochemical, and immunocytochemical analyses revealed a significant investment in storage and protective tissues compared to the non-galled leaf. These tissues are structurally compartmentalized in specific regions of the gall. However, the cellular symplastic and apoplastic characteristics allow for the sharing of these protective and nutritional functions between the two compartments.

由于细胞层数、细胞伸长轴和代谢物积累的改变，胆汁诱导促进寄主植物叶片组织的不同修饰。这种组织特化在胆囊发育部位允许结构和功能室的识别。外层组织室积聚具有营养和保护功能的代谢物，而内部组织室积聚参与诱导剂营养的高能分子。利用解剖学、组织计量学、组织化学和免疫细胞化学技术，绘制了组织起源和命运图，以评估每个原始组织层对成熟胆囊结构的投资水平。在球蛾- cecidomyiidae系统中，观察到特化组织的形成与能量和防御分子的积累之间的平衡。解剖、组织化学和免疫细胞化学分析显示，与未剥蚀的叶片相比，剥蚀叶片在储存和保护组织方面有显著的投资。这些组织在结构上被划分在胆的特定区域。然而，细胞的共塑性和外胞性特征允许在两个隔间之间共享这些保护和营养功能。

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引用次数: 0

Prediction of suitable areas for Prunus serrulata Lindl. in the context of future climate change 山李适宜种植面积的预测。在未来气候变化的背景下

IF 1.8 4区生物学 Q3 ECOLOGY

Flora

Pub Date : 2025-08-30 DOI: 10.1016/j.flora.2025.152827

Mengting He , Jiayiming Wang , Chunying Long , Zhiyi Zou , Ninghui Pan , Lihan Huang

Global climate change profoundly reshapes species distribution patterns. Prunus serrulata Lindl., a critically important ornamental species in China with high economic and aesthetic value, serves as an ideal model to assess such impacts. Species distribution modeling has become a key tool to evaluate the potential distribution of species under climate change. Here, using the maximum entropy (MaxEnt) model validated by a high AUC value (0.938), we integrated 127 occurrence records and 13 environmental variables to project its current and future distribution under four CMIP6 scenarios (SSP126, SSP245, SSP370, SSP585). The results showed that the five factors of driest monthly precipitation (Bio14, 32.5 % contribution), wettest monthly precipitation (Bio13, 18.4 %), coldest monthly minimum temperature (Bio6, 18.2 %), elevation (elev, 13.1 %), and isothermality (Bio3, 3.9 %) were the dominant factors affecting the distribution of P. serrulata. Currently, high-suitability areas (526,500 km², 5 % of China) are concentrated in the middle and lower reaches of the Yangtze River. Future projections indicate a 5–15 % expansion of high-suitability areas by 2041–2060, peaking under SSP585 scenario, while the distribution centroids shift northeastward by 220–300 km, suggesting potential relocation of the cultivation zone. This method provides a scientific basis for introducing and preserving germplasm, cultivating P. serrulata, optimizing bud dormancy garden layouts, enhancing the ecological benefits of urban vegetation, and increasing the aesthetic appeal of ornamental features.

全球气候变化深刻地重塑了物种分布格局。山李。作为中国重要的观赏树种，具有很高的经济和美学价值，可作为评估此类影响的理想模型。物种分布模型已成为评估气候变化下物种潜在分布的重要工具。利用高AUC值（0.938）验证的最大熵（MaxEnt）模型，综合127条发生记录和13个环境变量，预测了4种CMIP6情景（SSP126、SSP245、SSP370、SSP585）下其当前和未来的分布。结果表明，最干旱月降水量（Bio14，贡献32.5%）、最湿月降水量（Bio13，贡献18.4%）、最冷月最低气温（Bio6，贡献18.2%）、海拔（海拔，贡献13.1%）和等温（Bio3，贡献3.9%）5个因子是影响柽柳分布的主导因子。目前，高适宜区（52.65万平方公里，占中国国土面积的5%）集中在长江中下游。未来的预测表明，到2041-2060年，高适宜性区域将扩大5 - 15%，在SSP585情景下达到峰值，而分布质心将向东北移动220-300 km，表明可能发生耕地迁移。该方法为种质资源的引种和保存、木参的培育、花蕾休养园布局的优化、城市植被生态效益的提升、观赏特色的审美情趣等提供了科学依据。

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引用次数: 0

Comparative morpho-anatomical study of the native Fritillaria species from Romania and its taxonomic significance 罗马尼亚贝母种形态解剖学比较研究及其分类学意义

IF 1.8 4区生物学 Q3 ECOLOGY

Flora

Pub Date : 2025-08-26 DOI: 10.1016/j.flora.2025.152826

Anca Sârbu , Alina Georgiana Cîșlariu , Adrian Oprea , Culiță Sîrbu , Anca-Monica Paraschiv , Mioara Dumitrașcu

This study investigated the native Fritillaria species of Romania, Fritillaria montana Hoppe ex W.D.J. Koch (mesophilous), Fritillaria meleagris L. (meso‑hygrophilous), and Fritillaria meleagroides Schult. & Schult. fil. (halo-hygrophilous). Fritillaria montana and Fritillaria meleagris are protected in Romania, whereas Fritillaria meleagroides is newly recorded in the national flora. Field identification of these taxa relied on morphological traits visible during the reproductive period.

The study examines the vegetative organs (roots, bulbs, stems, and leaves) to provide a detailed understanding of species morpho-anatomy and to aid taxonomic identification outside the flowering phase. Given their differing ecological requirements, particular focus was on structural variation related to soil moisture conditions. Morphological measurements were complemented by anatomical analyses of cross-sections and paradermal sections (leaf) examined under optical microscopy.

Morphological differences among taxa were minor, whereas anatomical analyses revealed distinct histological features in all vegetative organs. Key traits include the presence or absence of aeriferous cavities in the root cortex and bulb storage parenchyma; variation in aeriferous formations in the stem medullary parenchyma; dimensional variation in stem parenchyma; numerical and dimensional differences in conductive bundles; presence or absence of perifascicular sheaths in the lamina; and differences in lamina cross-section outline.

Anatomical traits linked to moisture preference, particularly the occurrence of aeriferous formations, proved most informative for distinguishing species outside the reproductive period. These features formed the basis of a dichotomous identification key, designed for use under optical microscopy. The key enables reliable identification of Fritillaria taxa during the vegetative stage or from vegetative fragments.

本研究调查了罗马尼亚本地贝母种：中亲贝母montana Hoppe ex W.D.J. Koch、中亲湿贝母meleagris L.和meleagroides Schult贝母。, Schult。费尔。(halo-hygrophilous)。蒙大拿贝母和meleagris贝母在罗马尼亚受到保护，而meleagides贝母是新记录的国家植物区系。这些分类群的野外鉴定依赖于生殖期可见的形态特征。该研究检查了营养器官（根、球茎、茎和叶），以提供对物种形态解剖学的详细了解，并有助于花期以外的分类鉴定。鉴于它们不同的生态需求，特别关注与土壤湿度条件有关的结构变化。形态学测量由光学显微镜下检查的横切面和叶面解剖分析补充。各类群间形态差异不大，解剖分析显示各营养器官的组织学特征明显。主要特征包括根皮质和球茎储存薄壁中是否存在有气孔；茎髓实质中有气孔结构的变异；茎实质的尺寸变化；导电束的数值和尺寸差异；在椎板中存在或不存在囊鞘；以及层截面轮廓的差异。与湿度偏好有关的解剖特征，特别是有气孔构造的发生，被证明是区分生殖期以外物种的最重要的信息。这些特征构成了二分识别密钥的基础，设计用于光学显微镜下使用。该密钥能够在营养阶段或从营养碎片中可靠地识别贝母分类群。

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引用次数: 0

Heat-resistance response of Ceiba aesculifolia seedlings induced by thermopriming 热蒸煮对木棉幼苗耐热性的影响

IF 1.8 4区生物学 Q3 ECOLOGY

Flora

Pub Date : 2025-08-23 DOI: 10.1016/j.flora.2025.152825

Estela Corral-Castrejón , Leslie Hinojosa-Barrera , Ximena Gómez-Maqueo , Eleazar Martínez-Barajas , Noé Velázquez-Rosas , Alicia Gamboa-deBuen

Ceiba aesculifolia (ceiba) is a tropical plant species with high resistance to environmental stresses and assigns biomass and reserves to belowground tissues to cope with hydric stress. We determined if thermotolerance can be induced in ceiba seedlings by implementing a heat stress and heat priming protocol to germinating seeds. Assessment of seedling survival and development was done at two developmental stages, fully expanded cotyledon and three true leaves seedlings under controlled conditions, as well as saplings under field conditions. Heat stress was induced by subjecting germinated seeds to different supra-optimal temperatures for 45 min. A 100 % of seedlings subjected to heat below 42 °C survived. Seedling survival decreased at 48 °C and 50 °C, the latter also accumulated starch as a result of the treatment. The priming temperature was set at 37 °C since germinating seeds did not present any injury in the radicle and all seedlings survived. Thermopriming treatment at 37 °C for 90 min promoted 50 % of seedling survival to the lethal temperature (51 °C) and an increase in starch accumulation. No significant change on plant height and coverage in field conditions were detected in thermo-primed plants. Seedling survival and further development at 51 °C after thermopriming indicates the induction of thermotolerance mechanisms in ceiba by the presence of two or three tubers in 50 % of the treated seedlings and a 27 % increase in tuber starch content. These early developmental / functional responses in ceiba could allow them to develop and establish in heat-stressed soil environments.

Ceiba aescullifolia （Ceiba）是一种热带植物，对环境胁迫具有很高的抗性，并将生物量和储量分配给地下组织以应对水分胁迫。我们通过对发芽种子实施热胁迫和热诱导来确定是否可以诱导木棉幼苗耐热性。在两个发育阶段，对照条件下的全子叶和三真叶幼苗和田间条件下的树苗进行了幼苗存活和发育评价。将发芽种子置于不同超适温度下45 min，诱导热应激。在低于42°C的温度下，100%的幼苗存活。在48°C和50°C处理下，幼苗成活率下降，后者也积累了淀粉。萌发种子胚根无损伤，幼苗全部成活，因此将萌发温度设置为37℃。37°C热浸处理90 min可使50%的幼苗在致死温度（51°C）下存活并增加淀粉积累。在田间条件下，热处理植株的株高和盖度变化不显著。在51°C高温处理后，木棉的幼苗存活和进一步发育表明，50%的处理幼苗中存在两个或三个块茎，块茎淀粉含量增加27%，从而诱导了木棉的耐热机制。这些早期发育/功能反应可以使木棉在热胁迫土壤环境中发育和建立。

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引用次数: 0

Anatomical and physiological adjustments reveal mechanisms of drought response in seedlings 解剖和生理调节揭示了幼苗对干旱反应的机制

IF 1.8 4区生物学 Q3 ECOLOGY

Flora

Pub Date : 2025-08-22 DOI: 10.1016/j.flora.2025.152824

Stefany Priscila Reis Figueiredo , Beatriz Vitória Barbosa , Renan Marques Siqueira , Caroline Signori-Müller , Grazielle Sales Teodoro

Some tropical forests experience prolonged droughts, making it essential to understand species' drought resistance mechanisms. Anatomical traits related to hydraulic architecture explain how water transport occurs in plants and how species cope with water scarcity. However, the ability of species to adjust their hydraulic architecture to water availability remains unclear. We assessed variations in hydraulic architecture and physiological responses to drought, focusing on the coordination between anatomical and physiological traits. This study was conducted in a greenhouse with seedlings of three tropical species: Clitoria fairchildiana, Manilkara elata, and Bertholletia excelsa. We applied three water availability treatments (15 %, 50 %, and 100 % of field capacity) for four months. We measured branch anatomical traits: Vessel area (VA), Hydraulic diameter (Dh), Vessel density (VD), Vessel grouping index (VG), Vessel lumen fraction (F), and Xylem theoretical conductivity (Ks); physiological traits: Leaf predawn (Ψ_PD) and midday (Ψ_MD) water potential, and pressure–volume curve traits. All species adjusted their traits in response to water availability. Manilkara elata, the species with the highest wood density, exhibited smaller anatomical and hydraulic trait variations, with only a decrease in turgor loss point under water limitation. The two species with lower wood density showed contrasting responses. Bertholletia excelsa enhanced hydraulic efficiency by increasing Ks, VA and Dh, while C. fairchildiana increased drought resistance by adjusting turgor loss point and osmotic potential. Our results highlight a trade-off between water transport efficiency and drought resistance in C. fairchildiana. These results indicate distinct responses in each species that contribute to species survival under water limitation.

一些热带森林经历了长期干旱，因此了解物种的抗旱机制至关重要。与水力结构相关的解剖学特征解释了植物体内的水运是如何发生的，以及物种是如何应对缺水的。然而，物种调整其水力结构以适应水供应的能力尚不清楚。我们评估了水力结构的变化和对干旱的生理反应，重点是解剖和生理特征之间的协调。本研究是在温室中进行的，温室中有三种热带植物：阴蒂、马尼罗拉和贝索莱亚。我们使用了三种水分利用率处理（15%、50%和100%田间容量），持续4个月。我们测量了分支的解剖学特征：血管面积（VA）、水力直径（Dh）、血管密度（VD）、血管分组指数（VG）、血管管腔分数(F)和木质部理论电导率（Ks）；生理性状：叶片黎明前（ΨPD）和中午（ΨMD）水势、压力-体积曲线性状。所有物种都根据水的可用性调整了它们的特征。木密度最高的木香树解剖性状和水力性状变化较小，仅在水分限制下膨松损失点有所降低。两种密度较低的树种表现出截然不同的响应。黄花蒿通过提高Ks、VA和Dh来提高水力效率，黄花蒿通过调节膨松损失点和渗透势来提高抗旱性。我们的研究结果强调了水运效率和耐旱性之间的权衡。这些结果表明，在水分限制下，不同物种的不同反应有助于物种的生存。

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引用次数: 0

The interactive effect of phenolics and microorganisms on Sphagnum spore viability and germination 酚类物质与微生物对黑麦孢子活力与萌发的交互作用

IF 1.8 4区生物学 Q3 ECOLOGY

Flora

Pub Date : 2025-08-20 DOI: 10.1016/j.flora.2025.152823

Bei-Bei Fan , Azim Mallik , Si-Nan Wang , Jia-Qi Zhang , Jian-Yi Wang , Zhao-Jun Bu

Allelopathic interactions with microorganisms likely govern plant community assembly, yet their effects on spore germination of Sphagnum, a critical carbon-sequestering genus, remains unknown. Using a hummock sphagnum, S. fuscum and a hollow sphagnum, S. squarrosum, we tested the effects of three phenolic compounds and their mixture common in peatland water on spore germination with and without microorganisms. Both individual and mixture of phenolic compounds increased Sphagnum spore viability. In presence of microorganisms, the viability of S. fuscum spores reduced from 44 to 36 % when cultivated in ultrapure water but it was increased from 52 to 63 % in peat water. Phenolic compounds had inhibitory effect on microbial biomass with stronger effect in peat water (mixture of phenolics) than in individual phenolic compounds. The two Sphagnum species showed different response to allelopathy and microorganisms. While both species showed bet-hedging strategy, the hummock species maintained low and hollow species maintained high germinability. We conclude that Sphagnum-derived phenolics can maintain spore viability by inhibiting microorganisms. We suggest that the inhibitory effect of allelochemicals on microorganisms can be an important mechanism for maintaining viable spore bank in peatlands.

化感作用与微生物的相互作用可能控制着植物群落的聚集，但它们对Sphagnum（一种重要的碳封存属）孢子萌发的影响尚不清楚。以泥炭地水中常见的三种酚类化合物及其混合物对有微生物和无微生物的孢子萌发的影响为研究对象，研究了泥炭地水中常见的三种酚类化合物及其混合物对孢子萌发的影响。单独和混合酚类化合物均能提高Sphagnum孢子的活力。在有微生物存在的情况下，在超纯水中培养时，fuscum孢子的存活率从44%降低到36%，而在泥炭水中培养时，孢子的存活率从52%提高到63%。酚类化合物对微生物生物量有抑制作用，且在泥炭水中（酚类化合物混合物）的抑制作用强于单个酚类化合物。两种藻对化感作用和微生物的反应不同。两种植物均表现出下注-对冲策略，丘状植物保持低发芽率，空心植物保持高发芽率。我们得出结论，sphagum衍生的酚类物质可以通过抑制微生物来维持孢子的活力。我们认为化感物质对微生物的抑制作用可能是维持泥炭地活孢子库的重要机制。

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引用次数: 0

Drought priming enhances photosynthesis and growth of the ephemeral plant Erodium oxyrhinchum 干旱胁迫促进了短命植物黄牡丹的光合作用和生长

IF 1.8 4区生物学 Q3 ECOLOGY

Flora

Pub Date : 2025-08-17 DOI: 10.1016/j.flora.2025.152822

Yanfeng Chen , Qianli Zhang , Qian Liu , Hongmin Li , Chen Gong , Lan Zhang , Lingwei Zhang , Huiliang Liu

The increasing frequency and intensity of drought events due to climate change pose significant challenges to plant growth. However, it remains unclear whether drought priming during early growth stages can enhance plant resilience and mitigate the adverse effects of severe drought stress. To address this, we conducted an experiment on the desert ephemeral plant Erodium oxyrhinchum to examine its photosynthesis and growth responses to drought priming in the Gurbantunggut Desert, China. The field experiment included two treatments: (1) drought priming applied twice at the seedling stage followed by severe drought stress at the reproductive stage, and (2) adequate irrigation at the seedling stage followed by severe drought stress at the reproductive stage. Our results showed that drought priming significantly reduced stomatal conductance during the full leaf expansion stage, but enhanced net photosynthesis at the initial flowering stage. Compared to the control, drought-primed plants exhibited lower intercellular CO₂ concentrations at both the full leaf expansion and initial flowering stages, along with increased stomatal limitation and intrinsic water use efficiency. Additionally, drought priming significantly elevated superoxide dismutase activity and soluble sugar accumulation at the initial flowering stage. Throughout the plant’s life cycle, free proline and soluble sugar concentration initially increased and then declined, with both superoxide dismutase activity and soluble sugar concentration remaining significantly higher at the initial flowering stage under drought priming. These findings indicate that drought priming enhances stress tolerance by activating protective metabolic mechanisms, reducing transpiration, and improving both water use and photosynthetic efficiency. Finally, drought-primed plants not only exhibited greater resilience to severe drought stress but also demonstrated compensatory growth, leading to increased individual total biomass and reproductive output. Therefore, drought priming may serve as a promising strategy for sustaining plant growth under extreme drought conditions and offers valuable insights for vegetation restoration in arid and semi-arid ecosystems.

由于气候变化，干旱事件的频率和强度不断增加，对植物生长构成了重大挑战。然而，尚不清楚在生长早期的干旱诱导是否能提高植物的抗旱能力，减轻严重干旱胁迫的不利影响。为了解决这一问题，我们在古尔班通古特沙漠对沙漠短生植物黄花Erodium oxyrhinchum进行了试验，研究了其光合作用和生长对干旱的响应。田间试验包括两个处理：(1)苗期灌水2次，生殖期严重干旱胁迫；(2)苗期充分灌溉，生殖期严重干旱胁迫。结果表明，干旱胁迫显著降低了全叶膨大期的气孔导度，但提高了开花初期的净光合作用。与对照相比，干旱胁迫下植株在叶片全张期和开花初期细胞间CO 2浓度均较低，气孔限制和水分利用效率均有所提高。此外，干旱胁迫显著提高了开花初期的超氧化物歧化酶活性和可溶性糖积累。在植株的整个生命周期中，游离脯氨酸和可溶性糖浓度呈先上升后下降的趋势，在干旱胁迫下，超氧化物歧化酶活性和可溶性糖浓度在开花初期均保持较高水平。这些结果表明，干旱胁迫通过激活保护性代谢机制、减少蒸腾作用、提高水分利用和光合效率来增强抗逆性。最后，干旱胁迫下的植物不仅表现出更强的抗旱能力，而且表现出代偿性生长，导致个体总生物量和生殖产量增加。因此，干旱启动可能是在极端干旱条件下维持植物生长的一种有希望的策略，并为干旱和半干旱生态系统的植被恢复提供了有价值的见解。

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引用次数: 0

Physiological responses of Illicium difengpi to simulated persistent and intermittent droughts 地风皮illicum对模拟持续干旱和间歇干旱的生理响应

IF 1.8 4区生物学 Q3 ECOLOGY

Flora

Pub Date : 2025-08-16 DOI: 10.1016/j.flora.2025.152820

Baoyu Liu , Huiling Liang , Xiujiao Zhang , Hai Ren , Manlian Wang , Hui Tang , Xue Zhao , Dafeng Hui , Chenghua Deng

Global climate change has intensified the impacts of persistent and intermittent droughts on karst plants, especially on endangered and medicinal species, but research in this area remains limited. This study investigated the effects of two types of droughts, i.e., persistent drought–rehydration (PD-R) and cyclic mild/moderate drought–rehydration (CD-R), on Illicium difengpi, an endangered medicine plant native to the karst regions in China, using two-years-old seedlings. Key physiological variables were measured throughout the experimental period. The leaf relative water content and predawn water potential of the species rapidly recovered to the control levels after rehydration. However, photosynthesis-related variables—including net photosynthetic rate (P_n), effective PSII quantum yield (ΦPSII), photochemical quenching coefficient (qP), chlorophyll concentration (Chl a+b), Chl a/b ratio—were positively correlated with soil moisture content (SM) but negatively correlated with drought cycles, leading to increasing decline with increased drought severity and frequency. Consequently, these variables failed to fully recover during the rehydration phase following severe drought or multiple CD-R cycles. Malondialdehyde (MDA) accumulation significantly increased during severe drought and the third CD-R cycle. Catalase (CAT) activity increased progressively with drought intensity under PD-R (60–291 %), while CD-R induced significant increases of 28–68 % (mild) and 44–170 % (moderate). Proline (Pro) and soluble proteins (SP) elevated significantly only under severe persistent drought stress, showing no significant change under CD-R. This study demonstrates that: (i) I. difengpi exhibits strong post-drought water recovery; (ii) drought damage increases with severity and frequency; (iii) CAT plays a key role in antioxidant defense, while Pro and SP primarily respond to severe or multiple drought cycles. These findings provide a preliminary understanding of the physiological response of I. difengpi to persistent and intermittent drought.

全球气候变化加剧了持续和间歇性干旱对喀斯特植物的影响，特别是对濒危和药用植物的影响，但这方面的研究仍然有限。利用2年树苗，研究了持续干旱复水（PD-R）和循环轻度/中度干旱复水（CD-R）两种干旱类型对中国喀斯特地区濒危药用植物地风皮Illicium difengpi的影响。在整个实验期间测量关键生理变量。复水后叶片相对含水量和黎明前水势迅速恢复到对照水平。净光合速率（Pn）、有效PSII量子产率（ΦPSII）、光化学猝灭系数（qP）、叶绿素浓度（Chl a+b）、Chl a/b比与土壤含水量（SM）呈正相关，与干旱周期负相关，且随干旱严重程度和频率的增加而下降。因此，在严重干旱或多次CD-R循环后的补液阶段，这些变量未能完全恢复。丙二醛（MDA）积累在严重干旱和第三CD-R循环期间显著增加。在PD-R处理下，过氧化氢酶（CAT）活性随干旱强度的增加而逐渐增加（60 - 291%），CD-R处理下过氧化氢酶（CAT）活性显著增加28 - 68%（轻度）和44 - 170%（中度）。脯氨酸（Pro）和可溶性蛋白（SP）仅在严重持续干旱胁迫下显著升高，CD-R处理无显著变化。研究结果表明：(1)地凤壁具有较强的旱后水恢复能力；干旱损害随着严重程度和频率增加而增加；（iii） CAT在抗氧化防御中起关键作用，而Pro和SP主要响应严重或多次干旱循环。这些发现为地凤皮对持续干旱和间歇干旱的生理反应提供了初步认识。

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引用次数: 0

Corrigendum to “Intraspecific variation of leaf traits in tree plantings of different ages in a tropical forest” [Journal Flora 325 (2025) 152700] “热带森林不同树龄树木叶片性状的种内变异”的勘误表[植物学报325 (2025)152700]

IF 1.8 4区生物学 Q3 ECOLOGY

Flora

Pub Date : 2025-08-15 DOI: 10.1016/j.flora.2025.152818

Nathalie Loureiro , Jerônimo Sansevero

引用次数: 0

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