Document Detail

The matrix polysaccharide (1;3,1;4)-β-D-glucan is involved in silicon-dependent strengthening of rice cell wall.
MedLine Citation:
PMID:  25392067     Owner:  NLM     Status:  Publisher    
Poales (represented by rice [Oryza sativa L.]) in angiosperms and Equisetum (horsetails) in Pteridophytes are two major groups of heavy silicon (Si) accumulators. In rice, Si is polymerized preferentially in the epidermal cell wall, forming Si-cuticle double layers beneath the cuticle. This Si layer is thought to exert various beneficial effects on the growth and development of land plants. Although the recent discovery of the influx and efflux transporters of silicic acid has shed some light on the molecular mechanisms of Si uptake and transport in rice, the mechanism underlying the final incorporation of polymerized Si into the cell wall remains elusive. Despite their phylogenetic distance, the cell walls of the two Si accumulators, Poales and Equisetum, share another common component, i.e., (1;3, 1;4)-β-D-glucan, also known as mixed-linkage glucan (MLG), a matrix polysaccharide not found in other plants. Based on this coincidence, a possible correlation between the functions of Si and MLG in the cell wall has been suggested, but no experimental evidence has been obtained in support of this functional correlation. Here, we present an analysis of the correlative action of Si and MLG on the mechanical properties of leaf blades using a transgenic rice line in which the MLG level was reduced by overexpressing EGL1, which encodes (1;3,1;4)-β-D-glucanase. The reduction in MLG did not affect total Si accumulation, but it significantly altered the Si distribution profile and reduced the Si-dependent mechanical properties of the leaf blades, strongly suggesting a functional correlation between Si and MLG.
Natsumi Kido; Ryusuke Yokoyama; Tsuyoshi Yamamoto; Jun Furukawa; Hiroaki Iwai; Shinobu Satoh; Kazuhiko Nishitani
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2014-11-11
Journal Detail:
Title:  Plant & cell physiology     Volume:  -     ISSN:  1471-9053     ISO Abbreviation:  Plant Cell Physiol.     Publication Date:  2014 Nov 
Date Detail:
Created Date:  2014-11-13     Completed Date:  -     Revised Date:  2014-11-14    
Medline Journal Info:
Nlm Unique ID:  9430925     Medline TA:  Plant Cell Physiol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
© The Author 2014. Published by Oxford University Press on behalf of Japanese Society of Plant Physiologists. All rights reserved. For Permissions, please e-mail:
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