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Abscisic acid (ABA) plays important roles in multiple physiological processes, such as plant response to stresses and plant development. The ABA receptors pyrabactin resistance (PYR)/ PYR1-like (PYL)/regulatory components of ABA receptor (RCAR) play a crucial role in ABA perception and signaling. However, little is known about the details regarding PYL family genes in Brassica juncea var. tumida. Here, 25 PYL family genes were identified in B. juncea var. tumida genome, including BjuPYL3, BjuPYL4s, BjuPYL5s, BjuPYL6s, BjuPYL7s, BjuPYL8s, BjuPYL10s, BjuPYL11s, and BjuPYL13. The results of phylogenic analysis and gene structure showed that the PYL family genes performed similar gene characteristics. By analyzing cis -elements in the promoters of those BjuPYLs , several hormone and stress related cis -elements were found. The results of gene expression analysis showed that the ABA receptor homologous genes were induced by abiotic and biotic stress. The tissue-specific gene expression patterns of BjuPYLs also suggested those genes might regulate the stem swelling during plant growth. These findings indicate that Bj uPYLs are involved in plant response to stresses and organ development. This study provides valuable information for further functional investigations of PYL family genes in B. juncea var. tumida.

Genome-Wide Identification and Gene Expression Analysis of ABA Receptor Family Genes in Brassica juncea var. tumida