This Article Full Text Full Text (PDF) Supplemental Data All Versions of this Article: 20/1/228    most recent tpc.107.055657v1 Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in ISI Web of Science Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via CrossRef Citing Articles via Google Scholar Google Scholar Articles by Ding, X. Articles by Wang, S. Search for Related Content PubMed PubMed Citation Articles by Ding, X. Articles by Wang, S. Agricola Articles by Ding, X. Articles by Wang, S.

Activation of the Indole-3-Acetic Acid–Amido Synthetase GH3-8 Suppresses Expansin Expression and Promotes Salicylate- and Jasmonate-Independent Basal Immunity in Rice^[W]

National Key Laboratory of Crop Genetic Improvement, National Center of Plant Gene Research (Wuhan), Huazhong Agricultural University, Wuhan 430070, China

¹ Address correspondence to swang{at}mail.hzau.edu.cn.

New evidence suggests a role for the plant growth hormone auxin in pathogenesis and disease resistance. Bacterial infection induces the accumulation of indole-3-acetic acid (IAA), the major type of auxin, in rice (Oryza sativa). IAA induces the expression of expansins, proteins that loosen the cell wall. Loosening the cell wall is key for plant growth but may also make the plant vulnerable to biotic intruders. Here, we report that rice GH3-8, an auxin-responsive gene functioning in auxin-dependent development, activates disease resistance in a salicylic acid signaling– and jasmonic acid signaling–independent pathway. GH3-8 encodes an IAA–amino synthetase that prevents free IAA accumulation. Overexpression of GH3-8 results in enhanced disease resistance to the rice pathogen Xanthomonas oryzae pv oryzae. This resistance is independent of jasmonic acid and salicylic acid signaling. Overexpression of GH3-8 also causes abnormal plant morphology and retarded growth and development. Both enhanced resistance and abnormal development may be caused by inhibition of the expression of expansins via suppressed auxin signaling.

This article has been cited by other articles:

				R. Sasidharan, C.C. Chinnappa, L. A.C.J. Voesenek, and R. Pierik The Regulation of Cell Wall Extensibility during Shade Avoidance: A Study Using Two Contrasting Ecotypes of Stellaria longipes Plant Physiology, November 1, 2008; 148(3): 1557 - 1569. [Abstract] [Full Text] [PDF]

				K.-M. Hu, D.-Y. Qiu, X.-L. Shen, X.-H. Li, and S.-P. Wang Isolation and Manipulation of Quantitative Trait Loci for Disease Resistance in Rice Using a Candidate Gene Approach Mol Plant, September 1, 2008; 1(5): 786 - 793. [Abstract] [Full Text] [PDF]

				Y. Yang, R. Xu, C.-j. Ma, A. C. Vlot, D. F. Klessig, and E. Pichersky Inactive Methyl Indole-3-Acetic Acid Ester Can Be Hydrolyzed and Activated by Several Esterases Belonging to the AtMES Esterase Family of Arabidopsis Plant Physiology, July 1, 2008; 147(3): 1034 - 1045. [Abstract] [Full Text] [PDF]

				D. Qiu, J. Xiao, W. Xie, H. Liu, X. Li, L. Xiong, and S. Wang Rice Gene Network Inferred from Expression Profiling of Plants Overexpressing OsWRKY13, a Positive Regulator of Disease Resistance Mol Plant, May 1, 2008; 1(3): 538 - 551. [Abstract] [Full Text] [PDF]