Increasing light intensity in the mid and low canopy can improve maize (Zea mays L.) stalk lodging resistance. Field experiments involving altered leaf angle were designed to explore how leaf angle affects the light distribution within the canopy, stalk carbohydrate accumulation, stalk strength formation, and grain yield. When the leaf area was constant and the average leaf angle was decreased by ∼10° above the ear leaves and increased by ∼25° at the ear leaves and below, the photosynthetically active radiation (PAR) at the ear layer increased by 41–62%, and the interception of PAR (IPAR) below the ear increased by 107–229%. Average cellulose content of the third and fourth internodes increased by 13–21%, whereas lignin content increased by 9–30%. The rind penetration strength (RPS) of the third internode increased by 13–21%, whereas the crush strength (CS) of the fourth internode increased by 15–27%. These changes resulted in a reduction of 6–11% in the lodging percentage. The grain yield increased by 15–27% because of increases in kernel number and kernel weight. Therefore, under close planting, selecting a maize ideotype with upright leaves in the upper canopy and flat leaves in the lower canopy is conducive to rational radiation allocation in the maize canopy. This would facilitate structural carbohydrate accumulation and mechanical strength formation while improving lodging resistance and grain yield.

中文翻译：

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叶角改变对玉米秸秆抗倒伏性的影响

增加中低冠层的光强度可以改善玉米（玉米）L.）茎秆抗倒伏性。设计了涉及改变叶片角度的野外实验，以探索叶片角度如何影响冠层内的光分布，秸秆碳水化合物的积累，秸秆强度的形成和谷物的产量。当叶片面积恒定且平均叶片角度在耳叶上方降低约10°，在耳叶及下方降低约25°时，耳层的光合有效辐射（PAR）增加41-62 ％，而耳朵下方的PAR（IPAR）截获率增加了107-229％。第三和第四节间的平均纤维素含量增加了13–21％，而木质素含量增加了9–30％。第三节间的果皮穿透强度（RPS）增加了13–21％，而第四节间的压碎强度（CS）增加了15–27％。这些变化使住宿率降低了6-11％。由于籽粒数量和籽粒重量的增加，谷物的产量提高了15–27％。因此，在密植下，选择上部冠层叶片直立，下部冠层叶片扁平的玉米表型，有利于玉米冠层的合理辐射分配。这将促进结构性碳水化合物的积累和机械强度的形成，同时改善抗倒伏性和谷物产量。