Low Temperature-Enhanced Flavonol Synthesis Requires Light-Associated Regulatory Components in Arabidopsis thaliana

Plant & Cell Physiology
Chitra BhatiaPrabodh K Trivedi

Abstract

Plants are continuously exposed to a myriad of stresses, which lead to the formation of secondary metabolites including flavonoids. Studies suggest that low temperature exposure leads to enhanced flavonoid accumulation in Arabidopsis thaliana. In addition, flavonoid biosynthesis is regulated by light through various regulatory factors. Therefore, plants may possess the capability to integrate light and low temperature signals for survival under freezing conditions. However, the detailed molecular mechanism and the regulatory factors associated with light- and low temperature- responsive flavonoid biosynthesis remain largely unknown. Here, we report a strict requirement for light for the low temperature-enhanced flavonol biosynthesis. Low temperature-induced expression of biosynthetic genes as well as flavonol accumulation was hampered in ELONGATED HYPOCOTYL (hy5) and myb11myb111myb12 triple mutants as compared with the wild type in Arabidopsis. Overexpression of AtHY5 in the hy5 mutant restored induction of gene expression and flavonol accumulation in response to low temperature in light. Metabolite and gene expression analysis also suggests a negative role for CONSTITUTIVE PHOTOMORPHOGENIC1 (COP1) in accumulation of flavonols ...Continue Reading

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Citations

Mar 7, 2020·Frontiers in Plant Science·Saara Maria HartikainenThomas Matthew Robson
Jan 26, 2021·Plant Science : an International Journal of Experimental Plant Biology·Chitra BhatiaPrabodh Kumar Trivedi
Jun 5, 2021·Plant Physiology and Biochemistry : PPB·Priyanka SinghShamsul Hayat
Jun 11, 2021·Physiology and Molecular Biology of Plants : an International Journal of Functional Plant Biology·Katya GeorgievaMaya Velitchkova
Sep 8, 2021·Plant Molecular Biology·Prakash Kumar BhagatAlok Krishna Sinha

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