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A Shade Intensity Threshold Triggers Gibberellin Metabolic Reprogramming to Drive Shade Avoidance in Soybean
Lin Wang1, Suya Qiu1, Xiao Xu1
1Root Biology Center, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
International Journal of Molecular Sciences
|August 13, 2026
Summary
Soybean plants show shade avoidance responses above 80% shade, with increased height and internode elongation. Gibberellin (GA) accumulation mediates this response, impacting soybean yield in intercropping systems.
Area of Science:
- Plant Physiology
- Agricultural Science
- Crop Science
Background:
- Shade stress significantly reduces soybean yield in intercropping systems.
- The shade intensity threshold and hormonal regulation of shade avoidance responses in soybean are not well understood.
Purpose of the Study:
- To determine the critical shade coverage threshold for shade avoidance responses in soybean.
- To elucidate the hormonal mechanisms, particularly gibberellin (GA) involvement, in soybean shade avoidance.
- To assess the impact of shade on soybean growth, yield, and reproductive development.
Main Methods:
- Two-year field experiments with varying shade coverage rates.
- Measurement of plant height, internode elongation, and cell morphology.
- Hormonal profiling (GA content) and gene expression analysis (GA biosynthesis and catabolism genes).
- Application of exogenous GA to evaluate its effect on soybean phenotype.
Main Results:
- Shading above 80% coverage triggered shade avoidance, increasing plant height (16-61%) and internode elongation.
- Shade promoted GA accumulation by upregulating biosynthetic genes and downregulating catabolic genes, increasing GA1 content by 56.87%.
- Exogenous GA application mimicked shade-induced phenotypes, confirming GA's central role; yield was reduced by ~50% in pods and seeds, with a minor decrease in 100-seed weight.
Conclusions:
- Shade stress above 80% coverage induces significant shade avoidance responses in soybean, primarily mediated by gibberellin.
- Soybean yield is substantially reduced under shade due to suppressed reproductive growth, highlighting the need for shade-tolerant varieties.
- Understanding GA homeostasis provides a basis for breeding shade-tolerant soybeans and optimizing intercropping systems.
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