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Improved photosynthetic performance under unilateral weak light conditions in a wide-narrow-row intercropping system is associated with altered sugar transport

文献类型： 外文期刊

作者： Chen, Guopeng 1 ; Liu, Ming 3 ; Zhao, Xuyang 1 ; Bawa, George 1 ; Liang, Bing 1 ; Feng, Liang 1 ; Pu, Tian 1 ; Yong, Taiwen 1 ; Liu, Weiguo 1 ; Liu, Jiang 1 ; Du, Junbo 1 ; Yang, Feng 1 ; Wu, Yushan 1 ; Liu, Chunyan 1 ; Wang, Xiaochun 1 ; Yang, Wenyu 1 ;

作者机构： 1.Sichuan Agr Univ, Coll Agron, 211-Huimin Rd, Chengdu 611130, Peoples R China

2.Minist Agr, Sichuan Engn Res Ctr Crop Strip Intercropping Sys, Key Lab Crop Ecophysiol & Farming Syst Southwest, Chengdu, Peoples R China

3.Guangxi Subtrop Crops Res Inst, Nanning 530001, Peoples R China

关键词： Intercropping; light; maize; photosynthesis; sugar allocation; sugar metabolism

期刊名称：JOURNAL OF EXPERIMENTAL BOTANY （ 影响因子：6.9； 五年影响因子：8.0 ）

ISSN： 0022-0957

年卷期： 2024 年 75 卷 1 期

页码：

收录情况： SCI

摘要： Intercropping improves resource utilization. Under wide-narrow-row maize (Zea mays) intercropping, maize plants are subjected to weak unilateral illumination and exhibit high photosynthetic performance. However, the mechanism regulating photosynthesis under unilateral weak light remains unknown. We investigated the relationship between photosynthesis and sugar metabolism in maize under unilateral weak light. Our results showed that the net photosynthetic rate (P-n) of unshaded leaves increased as the level of shade on the other side increased. On the contrary, the concentration of sucrose and starch and the number of starch granules in the unshaded leaves decreased with increased shading due to the transfer of abundant C into the grains. However, sink loss with ear removal reduced the P-n of unshaded leaves. Intense unilateral shade (40% to 20% normal light), but not mild unilateral shade (60% normal light), reduced grain yield (37.6% to 54.4%, respectively). We further found that in unshaded leaves, Agpsl, Bmy, and Mexl-like expression significantly influenced sucrose and starch metabolism, while Sweet13a and Sut1 expression was crucial for sugar export. In shaded leaves, expression of Sps1, Agpsl, and Sweet13c was crucial for sugar metabolism and export. This study confirmed that unshaded leaves transported photosynthates to the ear, leading to a decrease in sugar concentration. The improvement of photosynthetic performance was associated with altered sugar transport. We propose a narrow-row spacing of 40 cm, which provides appropriate unilateral shade and limits yield reduction.

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