Journal article
Ammonium-induced loss of root gravitropism is related to auxin distribution and TRH1 function, and is uncoupled from the inhibition of root elongation in Arabidopsis
N Zou, B Li, G Dong, HJ Kronzucker, W Shi
Journal of Experimental Botany | OXFORD UNIV PRESS | Published : 2012
DOI: 10.1093/jxb/ers068
Abstract
Root gravitropism is affected by many environmental stresses, including salinity, drought, and nutrient deficiency. One significant environmental stress, excess ammonium (NH4+), is well documented to inhibit root elongation and lateral root formation, yet little is known about its effects on the direction of root growth. We show here that inhibition of root elongation upon elevation of external NH4+ is accompanied by a loss in root gravitropism (agravitropism) in Arabidopsis. Addition of potassium (K +) to the treatment medium partially rescued the inhibition of root elongation by high NH4+ but did not improve gravitropic root curvature. Expression analysis of the auxin-responsive reporter g..
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Awarded by National Natural Science Foundation of China
Awarded by National Basic Research Program of China
Awarded by Natural Sciences and Engineering Research Council of Canada (NSERC)
Funding Acknowledgements
We thank Dr Tom Guilfoyle (University of Missouri) for providing the DR5::GUS transgenic seeds, and the Arabidopsis Resource Center at Ohio State University for providing the Col-0 and mutant seeds used in this study. We also thank other members of our team and members in the laboratory of Professor Yanhua Su, Institute of Soil Science, Chinese Academy of Sciences for their assistance. This work was supported by the National Natural Science Foundation of China (30771285), the National Basic Research Program of China (2007CB109303), and the Natural Sciences and Engineering Research Council of Canada (NSERC, Discovery Grant 217277-2009).