NDLI: Characterization of a Xyloglucan Endotransglucosylase Gene That Is Up-Regulated by Gibberellin in Rice1 [w]

Content Provider	PubMed Central
Author	Jan, Asad Yang, Guangxiao Nakamura, Hidemitsu Ichikawa, Hiroaki Kitano, Hidemi Matsuoka, Makoto Matsumoto, Hiroshi Komatsu, Setsuko
Copyright Year	2004
Abstract	Xyloglucan endotransglucosylases/hydrolases (XTHs) that mediate cleavage and rejoining of the β (1-4)-xyloglucans of the primary cell wall are considered to play an important role in the construction and restructuring of xyloglucan cross-links. A novel rice (Oryza sativa) XTH-related gene, OsXTH8, was cloned and characterized after being identified by cDNA microarray analysis of gibberellin-induced changes in gene expression in rice seedlings. OsXTH8 was a single copy gene; its full-length cDNA was 1,298 bp encoding a predicted protein of 290 amino acids. Phylogenetic analysis revealed that OsXTH8 falls outside of the three established subfamilies of XTH-related genes. OsXTH8 was preferentially expressed in rice leaf sheath in response to gibberellic acid. In situ hybridization and OsXTH8 promoter GUS fusion analysis revealed that OsXTH8 was highly expressed in vascular bundles of leaf sheath and young nodal roots where the cells are actively undergoing elongation and differentiation. OsXTH8 gene expression was up-regulated by gibberellic acid and there was very little effect of other hormones. In two genetic mutants of rice with abnormal height, the expression of OsXTH8 positively correlated with the height of the mutants. Transgenic rice expressing an RNAi construct of OsXTH8 exhibited repressed growth. These results indicate that OsXTH8 is differentially expressed in rice leaf sheath in relation to gibberellin and potentially involved in cell elongation processes.
Related Links	http://dx.doi.org/10.1104/pp.104.052274
Ending Page	3681
Page Count	12
Starting Page	3670
File Format	PDF
ISSN	00320889
e-ISSN	15322548
Journal	Plant Physiology
Issue Number	3
Volume Number	136
Language	English
Publisher	American Society of Plant Biologists
Publisher Date	2004-11-01
Access Restriction	Open
Rights Holder	American Society of Plant Biologists
Subject Keyword	Plant Science Genetics Physiology Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Genetics Physiology Plant Science

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