Journal Article

RNAi-Mediated Knockdown of the XIP-Type Endoxylanase Inhibitor Gene, <i>OsXIP</i>, Has No Effect on Grain Development and Germination in Rice

Takaaki Tokunaga, Yoshie Miyata, Yukichi Fujikawa and Muneharu Esaka

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 49, issue 7, pages 1122-1127
Published in print July 2008 | ISSN: 0032-0781
Published online May 2008 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcn080
RNAi-Mediated Knockdown of the XIP-Type Endoxylanase Inhibitor Gene, OsXIP, Has No Effect on Grain Development and Germination in Rice

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OsXIP (Oryza sativa xylanase inhibitor protein) is a XIP-type xylanase inhibitor which was identified as a protein encoded by a wound stress-responsive gene in rice. Although the OsXIP gene was specifically expressed in mature grains under basal conditions, recombinant OsXIP had no effect on rice endogenous xylanases, and OsXIP-suppressed transgenic rice plants did not exhibit any change in grain development and germination, suggesting that rice development may be independent of OsXIP. Analysis using an OsXIP-specific antibody revealed that OsXIP is markedly accumulated in apoplast in rice root cells by wounding. These results reinforced the possibility that OsXIP is involved in plant defense mechanisms against phytopathogens.

Keywords: Oryza sativa; Stress response; Xylanase inhibitor

Journal Article.  3188 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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