Soybean steroids improve crop abiotic stress tolerance and increase yield

Area of Science:

• Plant Biology
• Biochemistry
• Genetics

Background:

• Sterols are vital in various biological processes, but their specific roles in plant stress responses are not fully understood.
• Soybean sterol metabolism pathways and their regulatory mechanisms require further elucidation.

Purpose of the Study:

• To investigate the role of the GmNF-YC9 transcription factor and its mediated CCAAT-box complex in soybean steroid metabolism.
• To determine the impact of GmNF-YC9 and squalene monooxygenase (GmSQE1) on soybean stress tolerance and crop yield.

Main Methods:

• Gene expression analysis of GmNF-YC9 and GmSQE1.
• Overexpression and inhibition studies of GmNF-YC9 and GmSQE1 in soybean plants.
• Field experiments to assess yield under drought stress.
• Transcriptome and metabolome analyses.
• Application of soybean steroids to various crop species.

Main Results:

• GmNF-YC9 directly activates GmSQE1, a key enzyme in steroid synthesis.
• Overexpression of GmNF-YC9 or GmSQE1 enhances soybean drought tolerance and yield, while inhibition of SQE reduces tolerance.
• Soybean steroids, fucosterol and soyasaponin II, significantly improve drought tolerance in soybean, wheat, foxtail millet, and maize.
• Enhanced stress tolerance is linked to reduced oxidative damage.

Conclusions:

• Soybean steroids play a critical role in mitigating oxidative stress and enhancing plant tolerance to abiotic stresses.
• GmNF-YC9-mediated regulation of steroid synthesis offers a novel target for improving crop resilience and quality.