Abscisic acid (ABA) is an essential phytohormone that not only regulates seeds dormancy,germination and seedling growth,but also is involved in responses to environmental stresses such as drought,high salinity and chilling.The identified ABA receptors,PYR/PYL/RCAR was found to directly bind and regulate the activity of the protein phosphatase 2C (PP2C).The Sucrose Non-fermentation Kinase Subfamily 2 (SnRK2s) protein kinases,a central signaling complex (ABA-PYR-PP2Cs-SnRK2s) that is responsible for ABA signal perception and transduction is supported by abundant genetic,physiological,biochemical and structural evidence.10 PYLs orthologs with the special structure of ABA receptor were identified in rice.Though the common signal transduction pathway was characterized among the members of PP2C family,the function and stress response of the OsPYLs were based on their ABA binding activity in rice.The basic leucine zipper (bZIP) factors are involved in ABA signaling pathway and play an important regulator during environmental stress response.There are 10 clades of bZIPs in rice,from clade A to clade J.The function of several rice bZIP-type transcription factors was analyzed and they are involved in the regulation of the adaptive stress response and plant fertility of rice.The result of phosphorylation by OsSnRK2s show that members from both clade A and clade G are involved in ABA signal pathway,but the signal transduction pathway of members from clade G may be different from those from clade A.