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, Guopeng Chen College of Agronomy, Sichuan Agricultural University , 211-Huimin Road, Wenjiang District, Chengdu 611130 , P.R. China Sichuan Engineering Research Center for Crop Strip Intercropping System, Key Laboratory of Crop Ecophysiology and Farming System in Southwest China (Ministry of Agriculture) , Chengdu , P. R. China Search for other works by this author on: Oxford Academic Ming Liu Guangxi Subtropical Crops Research Institute , Nanning 530001 , P.R. China Search for other works by this author on: Oxford Academic Xuyang Zhao College of Agronomy, Sichuan Agricultural University , 211-Huimin Road, Wenjiang District, Chengdu 611130 , P.R. China Sichuan Engineering Research Center for Crop Strip Intercropping System, Key Laboratory of Crop Ecophysiology and Farming System in Southwest China (Ministry of Agriculture) , Chengdu , P. R. China Search for other works by this author on: Oxford Academic George Bawa College of Agronomy, Sichuan Agricultural University , 211-Huimin Road, Wenjiang District, Chengdu 611130 , P.R. China Sichuan Engineering Research Center for Crop Strip Intercropping System, Key Laboratory of Crop Ecophysiology and Farming System in Southwest China (Ministry of Agriculture) , Chengdu , P. R. China Search for other works by this author on: Oxford Academic Bing Liang College of Agronomy, Sichuan Agricultural University , 211-Huimin Road, Wenjiang District, Chengdu 611130 , P.R. China Sichuan Engineering Research Center for Crop Strip Intercropping System, Key Laboratory of Crop Ecophysiology and Farming System in Southwest China (Ministry of Agriculture) , Chengdu , P. R. China Search for other works by this author on: Oxford Academic Liang Feng College of Agronomy, Sichuan Agricultural University , 211-Huimin Road, Wenjiang District, Chengdu 611130 , P.R. China Sichuan Engineering Research Center for Crop Strip Intercropping System, Key Laboratory of Crop Ecophysiology and Farming System in Southwest China (Ministry of Agriculture) , Chengdu , P. R. China Search for other works by this author on: Oxford Academic Tian Pu College of Agronomy, Sichuan Agricultural University , 211-Huimin Road, Wenjiang District, Chengdu 611130 , P.R. China Sichuan Engineering Research Center for Crop Strip Intercropping System, Key Laboratory of Crop Ecophysiology and Farming System in Southwest China (Ministry of Agriculture) , Chengdu , P. R. China Search for other works by this author on: Oxford Academic Taiwen Yong College of Agronomy, Sichuan Agricultural University , 211-Huimin Road, Wenjiang District, Chengdu 611130 , P.R. China Sichuan Engineering Research Center for Crop Strip Intercropping System, Key Laboratory of Crop Ecophysiology and Farming System in Southwest China (Ministry of Agriculture) , Chengdu , P. R. China Search for other works by this author on: Oxford Academic Weiguo Liu College of Agronomy, Sichuan Agricultural University , 211-Huimin Road, Wenjiang District, Chengdu 611130 , P.R. China Sichuan Engineering Research Center for Crop Strip Intercropping System, Key Laboratory of Crop Ecophysiology and Farming System in Southwest China (Ministry of Agriculture) , Chengdu , P. R. China Search for other works by this author on: Oxford Academic Jiang Liu College of Agronomy, Sichuan Agricultural University , 211-Huimin Road, Wenjiang District, Chengdu 611130 , P.R. China Sichuan Engineering Research Center for Crop Strip Intercropping System, Key Laboratory of Crop Ecophysiology and Farming System in Southwest China (Ministry of Agriculture) , Chengdu , P. R. China Search for other works by this author on: Oxford Academic
https://orcid.org/0000-0002-4225-1620 , Junbo Du College of Agronomy, Sichuan Agricultural University , 211-Huimin Road, Wenjiang District, Chengdu 611130 , P.R. China Sichuan Engineering Research Center for Crop Strip Intercropping System, Key Laboratory of Crop Ecophysiology and Farming System in Southwest China (Ministry of Agriculture) , Chengdu , P. R. China Search for other works by this author on: Oxford Academic Feng Yang College of Agronomy, Sichuan Agricultural University , 211-Huimin Road, Wenjiang District, Chengdu 611130 , P.R. China Sichuan Engineering Research Center for Crop Strip Intercropping System, Key Laboratory of Crop Ecophysiology and Farming System in Southwest China (Ministry of Agriculture) , Chengdu , P. R. China Search for other works by this author on: Oxford Academic Yushan Wu College of Agronomy, Sichuan Agricultural University , 211-Huimin Road, Wenjiang District, Chengdu 611130 , P.R. China Sichuan Engineering Research Center for Crop Strip Intercropping System, Key Laboratory of Crop Ecophysiology and Farming System in Southwest China (Ministry of Agriculture) , Chengdu , P. R. China Search for other works by this author on: Oxford Academic Chunyan Liu College of Agronomy, Sichuan Agricultural University , 211-Huimin Road, Wenjiang District, Chengdu 611130 , P.R. China Sichuan Engineering Research Center for Crop Strip Intercropping System, Key Laboratory of Crop Ecophysiology and Farming System in Southwest China (Ministry of Agriculture) , Chengdu , P. R. China Search for other works by this author on: Oxford Academic Xiaochun Wang College of Agronomy, Sichuan Agricultural University , 211-Huimin Road, Wenjiang District, Chengdu 611130 , P.R. China Sichuan Engineering Research Center for Crop Strip Intercropping System, Key Laboratory of Crop Ecophysiology and Farming System in Southwest China (Ministry of Agriculture) , Chengdu , P. R. China Correspondence: xchwang@sicau.edu.cn Search for other works by this author on: Oxford Academic Wenyu Yang College of Agronomy, Sichuan Agricultural University , 211-Huimin Road, Wenjiang District, Chengdu 611130 , P.R. China Sichuan Engineering Research Center for Crop Strip Intercropping System, Key Laboratory of Crop Ecophysiology and Farming System in Southwest China (Ministry of Agriculture) , Chengdu , P. R. China Search for other works by this author on: Oxford Academic
Journal of Experimental Botany, Volume 75, Issue 1, 1 January 2024, Pages 258–273, https://doi.org/10.1093/jxb/erad370
Published:
18 September 2023
Article history
Received:
13 September 2022
Editorial decision:
14 September 2023
Accepted:
15 September 2023
Published:
18 September 2023
Corrected and typeset:
24 October 2023
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Guopeng Chen, Ming Liu, Xuyang Zhao, George Bawa, Bing Liang, Liang Feng, Tian Pu, Taiwen Yong, Weiguo Liu, Jiang Liu, Junbo Du, Feng Yang, Yushan Wu, Chunyan Liu, Xiaochun Wang, Wenyu Yang, Improved photosynthetic performance under unilateral weak light conditions in a wide–narrow-row intercropping system is associated with altered sugar transport, Journal of Experimental Botany, Volume 75, Issue 1, 1 January 2024, Pages 258–273, https://doi.org/10.1093/jxb/erad370
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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.
Intercropping, light, maize, photosynthesis, sugar allocation, sugar metabolism
© 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.permissions@oup.com
This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/pages/standard-publication-reuse-rights)
Editor: Robert Hanco*ck Robert Hanco*ck Editor Search for other works by this author on: Oxford Academic
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