Auxin is widely involved in plant growth and development and its adaptation to the environment,and is the most important hormone in plants.In the past two decades,studies based on the model plant Arabidopsis thaliana have confirmed that establishment of auxin gradient through biosynthesis,metabolism,polar transport and signaling pathways determines organogenesis and polarity of plant organs.With the development of gene editing and molecular breeding research,how to apply the theoretical results related to auxin pathway in crop improvement,and coordinate the ideal plant/root type of crops through the selection and combination of dominant genes is a key issue in this field.In this review,we summarize the latest research progress in auxin field in the past five years,refer to the contribution of auxin to the improvement of rice agronomic traits,and discuss and look forward to the possibility of auxin application on soybean breeding.
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