Original data for for intercropped maize experiments, root barrier experiments in intercropped maize, and unilateral shading experiments

Intercropping improves resource utilization and yield; however, shading causes a decline in yield. Under wide-narrow-row maize-soybean 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. Therefore, we conducted an experiment with different planting configurations and two controlled environments to investigate photosynthesis, sugar metabolism, and photosynthate allocation in unshaded and shaded leaves under weak light. All three experiments detected an increase in the net photosynthetic rate (Pn) of unshaded leaves on one side with an increase in the level of shade on the other side leaves. 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 13C into the grains. However, sink loss with ear removal reduced...

间作可提升资源利用效率与作物产量，但遮荫会导致产量下降。在宽窄行玉米-大豆间作体系下，玉米植株会受到单侧弱光照胁迫，却表现出优异的光合性能。然而，单侧弱光下调控光合过程的机制仍未明确。为此，本研究设置不同种植配置与两种可控环境开展试验，旨在探究弱光条件下遮荫与非遮荫叶片的光合特性、糖代谢及光合产物分配规律。三项试验均观测到，当植株一侧非遮荫叶片对应的另一侧叶片遮荫程度提升时，该非遮荫叶片的净光合速率（net photosynthetic rate, Pn）随之升高。与之相反，由于大量碳13（13C）向籽粒转运，非遮荫叶片中的蔗糖、淀粉含量以及淀粉粒数量均随遮荫程度升高而降低。然而，去穗造成的库损失会削弱……