Abstract
Abscisic acid (ABA) is an essential phytohormone involved in many physiological processes, including plant growth inhibition and abiotic stress responses. Its signal transduction pathway is mediated by a genetically redundant family of ABA receptors (PYLs). In this work, 1′-O methyl ethers of ABA and its analogs were designed for chemically probing PYLs. The results suggested that 1′-OH is a crucial functional group correspondence to seed germination and development of plants, but has little relation on the stomatal movement and the response to drought stress regulated by ABA and its analogs. The methylation of 1′-OH significantly reduced their binding ability to monomer receptor PYL5 and slightly enhanced their binding to dimer receptor PYL2. The decrease of inhibition activities of 2a-2c was most probably assigned to the decrease of binding affinity with PYL5, which was due to the destruction of hydrogen bond network. This indicated that PYL5 was a selective receptor closely responded to plant growth process.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
