AtIQM1, a novel calmodulin-binding protein, is involved in stomatal movement in Arabidopsis.

Plant Molecular Biology
Yu-Ping ZhouChang-En Tian

Abstract

We recently identified a novel IQ motif-containing protein family, IQM, which shares sequence homology with a pea heavy metal-induced protein 6 and a ribosome inactivating protein, trichosanthin. Distinct expression patterns for each gene suggest that each IQM family member may play a different role in plant development and response to environmental cues. However functions of the IQM family members remain to be analyzed. IQM1 bound with calmodulin 5 (CaM5) in yeast two-hybrid assay via its IQ-motif. The CaM binding was Ca(2+)-independent in vitro, and was also observed in bimolecular fluorescence complementation analyses in onion epidermal cells. IQM1 was found to express strongly in guard cells and the cortex of roots. The T-DNA insertion mutants of IQM1 displayed a smaller stomatal aperture, a decreased water loss rate and a shorter primary root. Moreover, iqm1 did not change its stomatal aperture when treated with light, dark, ABA and chitin obviously. Microarray analyses showed that 243 and 28 genes were up- and down-regulated by more than twofold in iqm1-1, respectively. Interesting, 34 of 117 and 7 of 30 chitin-responsive transcriptional factor and ubiquitin ligase genes were up-regulated, respectively. Stomatal guard cel...Continue Reading

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Citations

Sep 1, 2015·Frontiers in Plant Science·Houqing ZengB W Poovaiah
Mar 28, 2013·Plant Signaling & Behavior·Steffen AbelJens Müller
Feb 17, 2019·The Journal of Biological Chemistry·Khanh LuuMatthew E Loewen
Oct 11, 2015·Molecular Genetics and Genomics : MGG·Ronghao CaiBeijiu Cheng
Dec 13, 2017·International Journal of Molecular Sciences·Changying ZengMing Peng
Nov 19, 2020·Proceedings. Biological Sciences·Kirsten Bomblies

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