Optimal coordination between photosynthetic acclimation strategy and canopy architecture in two contrasting cucumber cultivars

IF 2.6 Q1 AGRONOMY in silico Plants Pub Date : 2023-07-01 DOI:10.1093/insilicoplants/diad014
Yi-Chen Pao, Hartmut Stützel, Tsu-Wei Chen
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Abstract

Abstract Crop varieties differing in architectural characteristics (AC) vary in their intra-canopy light distribution. To optimize canopy photosynthesis, we hypothesize that varieties with contrasting AC possess different photosynthetic acclimation strategy (PAS) with respect to photosynthetic nitrogen (Np) partitioning. We firstly used in silico experiments to test this hypothesis and suggested a trade-off in Np partitioning between carboxylation and light harvesting to achieve optimal coordination between PAS, AC and growing light environment. Then, two cucumber (Cucumis sativus L.) cultivars, Aramon and SC-50, which were bred under greenhouse vertical single-stem and field creeping multi-branch canopy, were selected for studying their differences in AC and PAS using greenhouse and growth chamber experiments, respectively. In the greenhouse, more horizontal leaves of SC-50 resulted in steeper intra-canopy light gradient and a higher degree of self-shading, especially in the upper canopy layer. In growth chamber experiments, Aramon invested more leaf nitrogen into photosynthesis than SC-50, and the proportion (pNp) increased as light was reduced. In contrast, pNp of SC-50 did not respond to light but SC-50 partitioned its limited Np between carboxylation and light harvesting functions more effectively, showing a strategy particularly advantageous for canopies with a high degree of self-shading. This is further confirmed by additional in silico experiments showing that Np partitioning of SC-50 coped better with the impact of strong light competition caused by low light and by leaf clumping under high planting density. These findings provide a comprehensive perspective of genotypic variation in PAS, canopy architectures and their optimal coordination.
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两个对比黄瓜品种光合驯化策略与冠层结构的优化协调
不同建筑特征的作物品种在冠层内的光分布也不同。为了优化冠层光合作用,我们假设具有不同AC的品种在光合氮分配方面具有不同的光合驯化策略(PAS)。我们首先在硅实验中验证了这一假设,并提出了羧基化和光收集之间的Np分配权衡,以实现PAS, AC和生长光环境之间的最佳协调。以温室垂直单茎和田间匍匐多枝冠下栽培的2个黄瓜(Cucumis sativus L.)品种Aramon和SC-50为研究对象,分别采用温室和生长室内试验研究了其AC和PAS的差异。在温室内,SC-50水平叶片越多,冠层内光梯度越陡,自遮阳程度越高,尤其是冠层上层。在生长室试验中,Aramon比SC-50将更多的叶片氮投入到光合作用中,且比例(pNp)随光照的减少而增加。相比之下,SC-50的pNp对光没有反应,但SC-50更有效地将其有限的Np分配在羧基化和光收集功能之间,这一策略对高度自遮阳的冠层特别有利。另外的硅实验进一步证实了这一点,表明SC-50的Np分配能更好地应对低光照引起的强光竞争和高种植密度下的叶片结块的影响。这些发现提供了一个全面的视角来研究PAS、冠层结构及其最佳协调的基因型变异。
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来源期刊
in silico Plants
in silico Plants Agricultural and Biological Sciences-Agronomy and Crop Science
CiteScore
4.70
自引率
9.70%
发文量
21
审稿时长
10 weeks
期刊最新文献
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