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The phytohormone abscisic acid (ABA) is essential in plant responding to biotic and abiotic stresses. Although ABA signaling model is well established in  Arabidopsis , ABA receptor PYL family and clade A PP2C subfamily are not yet characterized in monocot model plant  Brachypodium distachyon . In this study, we identified 12  PYLs  and 8 clade A  PP2Cs  from  B. distachyon  genome and successfully cloned 12  PYLs  and 7 clade A  PP2Cs . Bioinformatic and expression analyses showed that most of the identified genes respond to several signal molecules and abiotic stresses. Protein–protein interaction analysis revealed that many BdPYLs and BdPP2CAs participate in the classic ABA-PYL-PP2C-SnRK2 signaling pathway. A clade A PP2C, designated BdPP2CA6, interacted with BdPYL11 in the absence of ABA and localized in nucleus. Most clade A PP2C members from  Arabidopsis  showed negatively regulation in ABA signaling pathway, whereas  BdPP2CA6 -overexpression transgenic  Arabidopsis  showed ABA hypersensitive phenotype, resulting in enhanced stomatal closure and salinity tolerance. Our results indicate that  BdPP2CA6  positively regulates ABA and stress signal pathway in transgenic  Arabidopsis  plant seedlings.

Brachypodium distachyon BdPP2CA6 Interacts with BdPYLs and BdSnRK2 and Positively Regulates Salt Tolerance in Transgenic Arabidopsis