光合作用
底纹
间作
糖
淀粉
蔗糖
碳水化合物代谢
生物
农学
新陈代谢
光合效率
园艺
植物
化学
食品科学
生物化学
艺术
视觉艺术
作者
Guopeng Chen,Ming Liu,Xuyang Zhao,George Bawa,Bing Liang,Liang Feng,Pu Tian,Taiwen Yong,Weiguo Liu,Jiang Liu,Junbo Du,Feng Yang,Yushan Wu,Chunyan Liu,Xiaochun Wang,Wenyu Yang
摘要
Abstract 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 (Pn) 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 Pn 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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