叶片光合作用与水稻（Oryza sativa）叶片叶脉中的木质部和韧皮部面积呈正相关。
Leaf photosynthesis is positively correlated with xylem and phloem areas in leaf veins in rice (Oryza sativa) plants.
机构信息
National Key Laboratory of Crop Genetic Improvement, Ministry of Agriculture Key Laboratory of Crop Ecophysiology and Farming System in the Middle Reaches of the Yangtze River, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, Hubei, China.
出版信息
Ann Bot. 2022 Apr 13;129(5):619-631. doi: 10.1093/aob/mcac020.
BACKGROUND AND AIMS
Leaf structure is an important determinant of leaf photosynthesis; however, the impacts of leaf structural traits on gas exchange parameters are still not fully understood. In the present study, 11 rice genotypes were grown in pots to investigate the influence of leaf structural traits on leaf photosynthesis and hydraulic conductance (Kleaf).
METHODS
In this study, leaf photosynthetic rate (A), stomatal conductance (gs), mesophyll conductance and Kleaf were measured. In addition, leaf structural traits including leaf thickness (LT), leaf mass per area and leaf xylem and phloem sizes were also measured to investigate their impacts on rice photosynthesis.
KEY RESULTS
We found that the total area of xylem conduits per major vein (Xmajor), leaf phloem area per minor vein (Pminor) and LT were positively correlated with Kleaf, gs and A. The path analysis suggested that, however, only Pminor had a direct impact on A; Xmajor had an indirect impact on A via gs and Pminor, while LT did not show any direct or indirect impact on A.
CONCLUSION
This study highlighted the importance of manipulations in Xmajor and Pminor, two previously overlooked leaf traits, to improve leaf photosynthesis in rice plants.
背景与目的
叶片结构是影响叶片光合作用的一个重要决定因素；然而，叶片结构特征对气体交换参数的影响仍不完全清楚。本研究通过盆栽试验，研究了 11 个水稻基因型的叶片结构特征对叶片光合作用和水力导度（Kleaf）的影响。
方法
本研究测定了叶片光合速率（A）、气孔导度（gs）、胞间导度和 Kleaf。此外，还测定了叶片结构特征，包括叶片厚度（LT）、比叶重和叶片木质部与韧皮部的大小，以研究它们对水稻光合作用的影响。
主要结果
我们发现，每条主叶脉的木质部导管总面积（Xmajor）、小叶脉韧皮部面积（Pminor）和 LT 与 Kleaf、gs 和 A 呈正相关。路径分析表明，只有 Pminor 对 A 有直接影响；Xmajor 通过 gs 和 Pminor 对 A 有间接影响，而 LT 对 A 没有直接或间接影响。
结论
本研究强调了操纵 Xmajor 和 Pminor 的重要性，这两个以前被忽视的叶片特征，可以提高水稻叶片的光合作用。
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