The phytohormone abscisic acid (ABA) is essential in plant response to
biotic and abiotic stresses. Although the ABA signaling model is well
established in Arabidopsis, ABA receptor PYL family and clade A PP2C
subfamily are not yet characterized in the monocot model plant Brachypodium
Fan Zhang and Qiuhui Wei from Huazhong University of Science and Technology
identified 12 PYLs and 8 clade A PP2Cs from the B. distachyon
and successfully cloned 12 PYLs and 7 clade A PP2Cs. Analysis indicates that
most of the identified genes respond to several signal molecules and abiotic
However, protein-protein interaction analysis revealed that many BdPYLs and
BdPP2CAs participate in the ABA-PYL-PP2C-SnRK2 signaling pathway. One clade
A PP2C, named BdPP2CA6, interacted with BdPYL11 in the absence of ABA. While
most clade A PP2C members from Arabidopsis showed negative regulation in ABA
signaling pathway, BdPP2CA6-overexpression in transgenic Arabidopsis
exhibited ABA hypersensitive phenotype, resulting in enhanced stomatal
closure and salinity tolerance.
These results indicate that BdPP2CA6 positively regulates ABA and stress
signal pathway in the transgenic Arabidopsis plant seedlings.
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