Arabidopsis Monothiol Glutaredoxin, AtGRXS17, Is Critical for Temperature-dependent Postembryonic Growth and Development via Modulating Auxin Response

• DOI: 10.1074/jbc.m110.201707
• Publication Date: 2011-04-23T02:52:59Z
• Authors: 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
• Keywords: Glutaredoxin; Plant hormone

Global environmental temperature changes threaten innumerable plant species. Although various signaling networks regulate responses to 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 mediate temperature-dependent postembryonic growth. expression was induced by elevated temperatures. Lines altered were hypersensitive temperatures phenocopied mutants of phytohormone auxin. We show auxin sensitivity polar transport perturbed mutants, whereas biosynthesis not altered. In addition, atgrxs17 plants displayed phenotypes consistent with defects proliferation and/or cell cycle control while accumulating higher levels reactive oxygen species cellular membrane damage under high temperature. Together, our findings provide nexus between homeostasis, signaling, responses.