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

doi:10.5061/dryad.pg4f4qrw5

These datasets were collected between 2020 and 2021 and include data from experiments involving different row spacings in intercropped maize, root barrier experiments in intercropped maize, and unilateral shading experiments.

### Description of the data and file structure

The dataset includes:
A) The photosynthetically active radiation (PAR) in the maize canopy during intercropping is measured in units of micromoles per square meter per second (µmol/m²/s). Please refer to the file \"1. Photosynthetically active radiation\" for specific data.
B) To view the gas exchange parameters for the intercropped maize experiments with different row spacings, root barrier experiments in intercropped maize, and unilateral shading experiments, please refer to the file \"2. 2020-2021 Gas exchange parameters.\"
C) Unilateral shading experi...

间作可提升资源利用效率与作物产量，但遮阴胁迫会导致产量下降。在宽窄行玉米-大豆间作体系中，玉米植株会受到单侧弱光胁迫，且表现出较高的光合性能，然而单侧弱光条件下调控光合过程的内在机制仍未明确。为此，本研究设置不同种植配置与两种可控环境开展试验，探究弱光环境下遮阴与非遮阴叶片的光合特性、糖代谢及光合产物分配规律。三项试验均发现：随着另一侧叶片遮阴程度的加深，单侧非遮阴叶片的净光合速率（net photosynthetic rate, Pn）显著升高。与之相反，由于大量13C向籽粒转运，非遮阴叶片中的蔗糖、淀粉含量及淀粉粒数量均随遮阴程度增加而降低。但去穗处理造成的库损失会减弱……

# 间作玉米试验、间作玉米根系阻隔试验及单侧遮阴试验的原始数据
DOI: 10.5061/dryad.pg4f4qrw5

本数据集采集于2020至2021年，涵盖间作玉米不同行距配置试验、间作玉米根系阻隔试验及单侧遮阴试验的相关实验数据。

### 数据与文件结构说明
本数据集包含：
A) 间作体系玉米冠层光合有效辐射（photosynthetically active radiation, PAR）数据，单位为微摩尔每平方米每秒（µmol/m²/s），具体数据详见文件「1. 光合有效辐射」。
B) 间作玉米不同行距配置试验、间作玉米根系阻隔试验及单侧遮阴试验的气体交换参数，详见文件「2. 2020-2021 Gas exchange parameters」。
C) 单侧遮阴试验……