Leaf and canopy scale drivers of genotypic variation in soybean response to elevated carbon dioxide concentration
Leaf and canopy scale drivers of genotypic variation in soybean response to elevated carbon dioxide concentration
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DOI：
10.1111/gcb.13678
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发表时间：
2017-09-01
影响因子：
11.6
通讯作者：
Ainsworth, Elizabeth A.
中科院分区：
文献类型：
--
作者：
Sanz-Saez, Alvaro;Koester, Robert P.;Ainsworth, Elizabeth A.
今天农作物生长的大气[CO2]比其驯化历史上的任何时候都要多，这代表着对种子产量产生积极影响的机会，可以抵消本世纪更严重的高温和干旱的负面影响。为了在未来大气 [CO2] 下实现产量最大化，我们需要识别和研究对 [CO2] 升高反应最有利的作物品种，并了解其响应机制。大豆 (Glycine max Merr.) 是一种广泛种植的油籽作物，随着 [CO2] 升高而表现出遗传变异。然而，很少有研究研究这种变异的生理基础。在这里，我们检查了两个大豆品种（Loda 和 HS93-4118）的冠层光截获、光合作用、呼吸和辐射利用效率以及产量和产量参数，此前报道这两个品种在环境 [CO2] 下具有相似的种子产量，但对 [CO2] 升高的反应却相反。在响应性品种 Loda 中，当 [CO2] 升高（600 μmol/mol）时，种子产量增加了 26%，但 HS93-4118 只增加了 11%。在环境 [CO2] 中，HS93-4118 的冠层光截获和叶面积指数更大，但在洛达 (Loda) 中，随着 [CO2] 升高而增加更多。在环境温度和升高的 [CO2] 条件下，Loda 的辐射利用效率和收获指数也高于 HS93-4118。两个品种的每日碳同化量在 [CO2] 升高时较多，而气孔导度较低。 Loda 的电子传输能力也高于 HS93-4118，但两个品种的光合性状对 [CO2] 升高的响应没有差异。总体而言，对叶片和冠层光合性状的更深入了解为模拟响应升高的 [CO2] 的基因型变化提供了强有力的概念基础。
The atmospheric [CO2] in which crops grow today is greater than at any point in their domestication history and represents an opportunity for positive effects on seed yield that can counteract the negative effects of greater heat and drought this century. In order to maximize yields under future atmospheric [CO2], we need to identify and study crop cultivars that respond most favorably to elevated [CO2] and understand the mechanisms contributing to their responsiveness. Soybean (Glycine max Merr.) is a widely grown oilseed crop and shows genetic variation in response to elevated [CO2]. However, few studies have studied the physiological basis for this variation. Here, we examined canopy light interception, photosynthesis, respiration and radiation use efficiency along with yield and yield parameters in two cultivars of soybean (Loda and HS93-4118) previously reported to have similar seed yield at ambient [CO2], but contrasting responses to elevated [CO2]. Seed yield increased by 26% at elevated [CO2] (600 mu mol/mol) in the responsive cultivar Loda, but only by 11% in HS93-4118. Canopy light interception and leaf area index were greater in HS93-4118 in ambient [CO2], but increased more in response to elevated [CO2] in Loda. Radiation use efficiency and harvest index were also greater in Loda than HS93-4118 at both ambient and elevated [CO2]. Daily C assimilation was greater at elevated [CO2] in both cultivars, while stomatal conductance was lower. Electron transport capacity was also greater in Loda than HS93-4118, but there was no difference in the response of photosynthetic traits to elevated [CO2] in the two cultivars. Overall, this greater understanding of leaf-and canopy-level photosynthetic traits provides a strong conceptual basis for modeling genotypic variation in response to elevated [CO2].