Arabidopsis monothiol glutaredoxin, AtGRXS17, is critical for temperature-dependent postembryonic growth and development via modulating auxin response

Ning Hui Cheng, Jian Zhong Liu, Xing Liu, Qingyu Wu, Sean M. Thompson, Julie Lin, Joyce Chang, Steven A. Whitham, Sunghun Park, Jerry D. Cohen, Kendal D. Hirschi

Research output: Contribution to journalArticlepeer-review

82 Scopus citations

Abstract

Global environmental temperature changes threaten innumerable plant species. Although various signaling networks regulate plant responses to temperature fluctuations, the mechanisms unifying these diverse processes are largely unknown. Here, we demonstrate that an Arabidopsis monothiol glutaredoxin, AtGRXS17 (At4g04950), plays a critical role in redox homeostasis and hormone perception to mediate temperature-dependent postembryonic growth. AtGRXS17 expression was induced by elevated temperatures. Lines altered in AtGRXS17 expression were hypersensitive to elevated temperatures and phenocopied mutants altered in the perception of the phytohormone auxin. We show that auxin sensitivity and polar auxin transport were perturbed in these mutants, whereas auxin biosynthesis was not altered. In addition, atgrxs17 plants displayed phenotypes consistent with defects in proliferation and/or cell cycle control while accumulating higher levels of reactive oxygen species and cellular membrane damage under high temperature. Together, our findings provide a nexus between reactive oxygen species homeostasis, auxin signaling, and temperature responses.

Original languageEnglish (US)
Pages (from-to)20398-20406
Number of pages9
JournalJournal of Biological Chemistry
Volume286
Issue number23
DOIs
StatePublished - Jun 10 2011

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