The invention discloses application of a CSA1
gene in regulating and controlling branching angles and petiole angles of leguminous plants and creating close-planting-resistant high-yield
plant type leguminous plants. According to the invention, a CSA1
gene is cloned from soybean, and a
CRISPR-Cas9
system is further utilized to edit the CSA1
gene, so that two different mutants are obtained. A result shows that the
branching angle and the petiole angle of a
mutant plant are remarkably reduced, and the yield of the
mutant is remarkably higher than that of a
wild type under a high-density planting condition, so that the CSA1 gene can regulate and control the
branching angle and the petiole angle of the leguminous
plant and create a close-planting-resistant leguminous plant, an important gene resource is provided for
molecular breeding of the leguminous plant, and the application prospect is wide. And an effective means is provided for creating close-planting-resistant high-yield leguminous plants.