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

© The Author(s) 2023. Published by Oxford University Press on behalf of the Society for Experimental Biology. All rights reserved. For permissions, please email: journals.permissionsoup.com.

Bibliographische Detailangaben
Veröffentlicht in:Journal of experimental botany. - 1985. - 75(2024), 1 vom: 01. Jan., Seite 258-273
1. Verfasser: Chen, Guopeng (VerfasserIn)
Weitere Verfasser: Liu, Ming, Zhao, Xuyang, Bawa, George, Liang, Bing, Feng, Liang, Pu, Tian, Yong, Taiwen, Liu, Weiguo, Liu, Jiang, Du, Junbo, Yang, Feng, Wu, Yushan, Liu, Chunyan, Wang, Xiaochun, Yang, Wenyu
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2024
Zugriff auf das übergeordnete Werk:Journal of experimental botany
Schlagworte:Journal Article Research Support, Non-U.S. Gov't Intercropping light maize photosynthesis sugar allocation sugar metabolism Starch 9005-25-8 mehr... Sucrose 57-50-1
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520 |a 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 
650 4 |a Journal Article 
650 4 |a Research Support, Non-U.S. Gov't 
650 4 |a Intercropping 
650 4 |a light 
650 4 |a maize 
650 4 |a photosynthesis 
650 4 |a sugar allocation 
650 4 |a sugar metabolism 
650 7 |a Starch  |2 NLM 
650 7 |a 9005-25-8  |2 NLM 
650 7 |a Sucrose  |2 NLM 
650 7 |a 57-50-1  |2 NLM 
700 1 |a Liu, Ming  |e verfasserin  |4 aut 
700 1 |a Zhao, Xuyang  |e verfasserin  |4 aut 
700 1 |a Bawa, George  |e verfasserin  |4 aut 
700 1 |a Liang, Bing  |e verfasserin  |4 aut 
700 1 |a Feng, Liang  |e verfasserin  |4 aut 
700 1 |a Pu, Tian  |e verfasserin  |4 aut 
700 1 |a Yong, Taiwen  |e verfasserin  |4 aut 
700 1 |a Liu, Weiguo  |e verfasserin  |4 aut 
700 1 |a Liu, Jiang  |e verfasserin  |4 aut 
700 1 |a Du, Junbo  |e verfasserin  |4 aut 
700 1 |a Yang, Feng  |e verfasserin  |4 aut 
700 1 |a Wu, Yushan  |e verfasserin  |4 aut 
700 1 |a Liu, Chunyan  |e verfasserin  |4 aut 
700 1 |a Wang, Xiaochun  |e verfasserin  |4 aut 
700 1 |a Yang, Wenyu  |e verfasserin  |4 aut 
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