Journal Article

Function of GRAS Proteins in Root Nodule Symbiosis is Retained in Homologs of a Non-Legume, Rice

Keisuke Yokota, Takashi Soyano, Hiroshi Kouchi and Makoto Hayashi

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 51, issue 9, pages 1436-1442
Published in print September 2010 | ISSN: 0032-0781
Published online August 2010 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcq124
Function of GRAS Proteins in Root Nodule Symbiosis is Retained in Homologs of a Non-Legume, Rice

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  • Biochemistry
  • Molecular and Cell Biology
  • Plant Sciences and Forestry

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Root nodule (RN) symbiosis in legumes shares genes involved in the early signaling pathway with more ancient arbuscular mycorrhiza (AM) symbiosis, which is widespread in higher plants. The non-legume homologs of such genes have been well documented to be not only essential for the AM symbiosis in non-legume mycorrhizal plants but also functional in the RN symbiosis in legume plants. In contrast, it has not been investigated in detail whether RN symbiosis-specific genes, which are not essential for AM symbiosis, are functionally conserved in non-legumes. Two GRAS-domain transcription factors, NSP1 and NSP2, have been shown to be required for RN symbiosis, but not for AM symbiosis. In this study, we demonstrated that their homologs, OsNSP1 and OsNSP2, from rice are able to fully rescue the RN symbiosis-defective phenotypes of the mutants of corresponding genes in the model legume, Lotus japonicus. Our results indicate that some of the genes essential for RN symbiosis conserve their functions in homologs from non-legumes, which do not nodulate.

Keywords: GRAS protein; Lotus japonicus; NSP1; NSP2; Rice; Root nodule symbiosis

Journal Article.  4061 words.  Illustrated.

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

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