Liyan Shang, Zichen Liu, Shuaijun Dai, Jiayu Ye, Tian Sheng, Jun Deng, Chunhu Wang, Ke Liu, Xiaohai Tian, Yunbo Zhang, Liying Huang
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Whether weak light leads to poor canopy structure and thus affects light distribution and RUE, thereby reducing dry matter accumulation and grain yield remains unknown.</div></div><div><h3>Objective and methods</h3><div>The objectives of this study were to explore the effects of global dimming on canopy structure, and its relationships with canopy light distribution and RUE under artificially simulated weak light in hybrid rice. Field experiments with two rice hybrids (Y-liangyou900, YLY900; Chuanyou6203, CY6203) were conducted under no shading (CK), 40 % shading at booting stage (S) and 40 % shading at grain-filling stage (SS) in 2021 and 2022.</div></div><div><h3>Results</h3><div>The effects of shading on the growth characteristics and yield of rice varied with different varieties. Shading at booting stage resulted in larger basal, opening and drooping angles of the top three leaves of both varieties. This rise in leaf angles increased the light extinction coefficient (K<sub>L</sub>) of YLY900, but it had no significant effect on CY6203. Shading significantly reduced RUE during the total growth period, with reductions of 24.3 % and 16.8 % under S, and 11.1 % and 8.9 % under SS for YLY900 and CY6203 in two years, respectively. The total dry weight of YLY900 under S and SS was 34.6 % and 22.8 % lower than that under CK in both years, accordingly, the total dry weight of CY6203 was 27.0 % and 21.6 % lower, respectively. Ultimately, shading resulted in a significant decrease in grain yield compared with CK, and the effect of S on yield was greater than that of SS because of the significantly lower spikelet differentiation under S. In terms of varieties, shading had a greater effect on canopy structure, light distribution and RUE of YLY900 than that of CY6203, which explained yield advantage of CY6203 over YLY900 under shading.</div></div><div><h3>Conclusions</h3><div>Shading increased leaf angles of the top three leaves and caused a draped canopy structure. This change affected the canopy light distribution and RUE. Therefore, the varieties with slightly draped upper leaves might be better able to adapt to the global dimming and reduce yield loss.</div></div><div><h3>Implications or significance</h3><div>Understanding the changes of canopy structure, light distribution and RUE under shading were highly significant for the breeding and cultivation of climate-dependent varieties.</div></div>","PeriodicalId":12143,"journal":{"name":"Field Crops Research","volume":"318 ","pages":"Article 109605"},"PeriodicalIF":5.6000,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Changes of rice canopy structure under global dimming\",\"authors\":\"Liyan Shang, Zichen Liu, Shuaijun Dai, Jiayu Ye, Tian Sheng, Jun Deng, Chunhu Wang, Ke Liu, Xiaohai Tian, Yunbo Zhang, Liying Huang\",\"doi\":\"10.1016/j.fcr.2024.109605\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><h3>Context</h3><div>Global dimming reduces incident radiation, and thus affects rice yield. Canopy structure is closely related to light interception, internal light distribution, photosynthesis and radiation use efficiency (RUE). However, less attention is paid to the effects of global dimming on rice canopy structure. Whether weak light leads to poor canopy structure and thus affects light distribution and RUE, thereby reducing dry matter accumulation and grain yield remains unknown.</div></div><div><h3>Objective and methods</h3><div>The objectives of this study were to explore the effects of global dimming on canopy structure, and its relationships with canopy light distribution and RUE under artificially simulated weak light in hybrid rice. Field experiments with two rice hybrids (Y-liangyou900, YLY900; Chuanyou6203, CY6203) were conducted under no shading (CK), 40 % shading at booting stage (S) and 40 % shading at grain-filling stage (SS) in 2021 and 2022.</div></div><div><h3>Results</h3><div>The effects of shading on the growth characteristics and yield of rice varied with different varieties. Shading at booting stage resulted in larger basal, opening and drooping angles of the top three leaves of both varieties. This rise in leaf angles increased the light extinction coefficient (K<sub>L</sub>) of YLY900, but it had no significant effect on CY6203. Shading significantly reduced RUE during the total growth period, with reductions of 24.3 % and 16.8 % under S, and 11.1 % and 8.9 % under SS for YLY900 and CY6203 in two years, respectively. 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引用次数: 0
摘要
背景全球气候变暗会减少入射辐射,从而影响水稻产量。冠层结构与光拦截、内光分布、光合作用和辐射利用效率(RUE)密切相关。然而,人们较少关注全球光照变暗对水稻冠层结构的影响。本研究的目的是探讨全球调光对杂交水稻冠层结构的影响,以及在人工模拟弱光条件下冠层光分布和辐射利用效率的关系。结果遮光对水稻生长特性和产量的影响因品种而异。在抽穗期遮光会导致两个品种前三片叶片的基角、开角和下垂角增大。叶片角度的增加提高了 YLY900 的光消光系数(KL),但对 CY6203 没有显著影响。遮光明显降低了整个生长期的RUE,YLY900和CY6203在S条件下分别降低了24.3%和16.8%,在SS条件下分别降低了11.1%和8.9%。在 S 和 SS 条件下,YLY900 两年的总干重分别比 CK 条件下低 34.6 % 和 22.8 %,相应地,CY6203 的总干重分别低 27.0 % 和 21.6 %。在品种方面,遮光对 YLY900 的冠层结构、光分布和 RUE 的影响均大于 CY6203,这说明在遮光条件下 CY6203 比 YLY900 具有产量优势。这一变化影响了冠层光照分布和产量。影响或意义了解遮光条件下冠层结构、光分布和RUE的变化对培育和种植气候依赖型品种意义重大。
Changes of rice canopy structure under global dimming
Context
Global dimming reduces incident radiation, and thus affects rice yield. Canopy structure is closely related to light interception, internal light distribution, photosynthesis and radiation use efficiency (RUE). However, less attention is paid to the effects of global dimming on rice canopy structure. Whether weak light leads to poor canopy structure and thus affects light distribution and RUE, thereby reducing dry matter accumulation and grain yield remains unknown.
Objective and methods
The objectives of this study were to explore the effects of global dimming on canopy structure, and its relationships with canopy light distribution and RUE under artificially simulated weak light in hybrid rice. Field experiments with two rice hybrids (Y-liangyou900, YLY900; Chuanyou6203, CY6203) were conducted under no shading (CK), 40 % shading at booting stage (S) and 40 % shading at grain-filling stage (SS) in 2021 and 2022.
Results
The effects of shading on the growth characteristics and yield of rice varied with different varieties. Shading at booting stage resulted in larger basal, opening and drooping angles of the top three leaves of both varieties. This rise in leaf angles increased the light extinction coefficient (KL) of YLY900, but it had no significant effect on CY6203. Shading significantly reduced RUE during the total growth period, with reductions of 24.3 % and 16.8 % under S, and 11.1 % and 8.9 % under SS for YLY900 and CY6203 in two years, respectively. The total dry weight of YLY900 under S and SS was 34.6 % and 22.8 % lower than that under CK in both years, accordingly, the total dry weight of CY6203 was 27.0 % and 21.6 % lower, respectively. Ultimately, shading resulted in a significant decrease in grain yield compared with CK, and the effect of S on yield was greater than that of SS because of the significantly lower spikelet differentiation under S. In terms of varieties, shading had a greater effect on canopy structure, light distribution and RUE of YLY900 than that of CY6203, which explained yield advantage of CY6203 over YLY900 under shading.
Conclusions
Shading increased leaf angles of the top three leaves and caused a draped canopy structure. This change affected the canopy light distribution and RUE. Therefore, the varieties with slightly draped upper leaves might be better able to adapt to the global dimming and reduce yield loss.
Implications or significance
Understanding the changes of canopy structure, light distribution and RUE under shading were highly significant for the breeding and cultivation of climate-dependent varieties.
期刊介绍:
Field Crops Research is an international journal publishing scientific articles on:
√ experimental and modelling research at field, farm and landscape levels
on temperate and tropical crops and cropping systems,
with a focus on crop ecology and physiology, agronomy, and plant genetics and breeding.