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Abscisic acid (ABA) is an essential phytohormone involved in diverse physiological processes. Although genome-wide analyses of the ABA receptor PYR/PYL/RCAR (PYL) protein/gene family have been performed in certain plant species, little is known about the ABA receptor protein/gene family in the rubber tree ( Hevea brasiliensis ). In this study, we identified 14 ABA receptor PYL proteins/genes (designated  HbPYL1  through  HbPYL14 ) in the most recent rubber tree genome. A phylogenetic tree was constructed, which demonstrated that  HbPYLs  can be divided into three subfamilies that correlate well with the corresponding  Arabidopsis  subfamilies. Eight  HbPYLs  are highly expressed in laticifers. Five of the eight genes are simultaneously regulated by ABA, jasmonic acid (JA) and ethylene (ET). The identification and characterization of  HbPYLs  should enable us to further understand the role of ABA signal in the rubber tree.

Identification and characterization of the abscisic acid (ABA) receptor gene family and its expression in response to hormones in the rubber tree