Effects of Shading on the Internode Critical for Soybean (Glycine Max) Lodging

Increasing planting density is among the most effective ways to increase soybean yield, but high increases lodging risks in plants. To examine effects of shading on plant lodging, tall cultivar Heinong 48 (HN48) and dwarf Henong 60 (HN60), two cultivars with large height differences (approximately 40 cm), were selected, their internode lengths measured under different densities 2019 determine key influencing lodging. In 2020, we treated plants treatments morphology, anatomical structure stem fiber composition fifth internode, changes GA3 (gibberellic acid) content, relative expression GA3-related enzyme genes conditions. The results showed that as increased, internodes changed significantly, starting from internode. Under conditions, length increased for both cultivars, diameter diameter-to-length ratio decreased; area xylem decreased, pith cells stretched more longitudinally orderly; lignin, cellulose, hemicellulose contents content levels GmGA3ox6, GmGA20ox1-D, GmGA2ox4 all upregulated; change PSN treatment was significant than other treatments. Therefore, affected plants, could significantly stems, positively correlated shaded area. This study provides a new direction future research resistance densely planted or intercropped