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ID 52277
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Author
Kakeda, Katsuyuki
Ishihara, Norimitsu
Izumi, Yohei
Abstract
Most cereal crops have hulless grains (naked caryopses) with a free-threshing trait, whereas the majority of barley cultivars show hulled (covered) caryopses. The naked caryopsis in barley is genetically controlled by a single locus, nod. The Nud gene (the covered caryopsis allele) encodes an ethylene response factor (ERF) family transcription factor that regulates a lipid biosynthetic pathway. For functional analysis of the barley Nud gene, we produced transgenic rice expressing Nod in the developing caryopses. All transgenic lines had caryopses that were easily dehulled at maturity, indicating that the naked caryopsis phenotype remained in spite of expression of the Nod transgene. Histochemical and lipid analyses of the transgenic rice caryopses did not show increased lipid accumulation on the surface of developing caryopses, suggesting that the Nud-mediated lipid pathway may not function in rice caryopses. The predicted rice ortholog of Nod, Os06ERF was expressed specifically in the developing caryopses. However, expression of Os06ERF ceased at an earlier developmental stage than that of the native Nod gene in barley caryopses, which was also the case for expression of the Nod transgene. This raises the alternative hypothesis that the timing of Nod expression may be critical for activating the pathway for hull-caryopsis adhesion.
Keywords
Nud gene
transformation
covered/naked caryopsis
lipid biosynthesis
ERF/AP2
grass
Published Date
2011-03
Publication Title
Breeding Science
Volume
volume61
Issue
issue1
Start Page
35
End Page
42
ISSN
1344-7610
Content Type
Journal Article
language
英語
Copyright Holders
Copyright © 2011 by JAPANESE SOCIETY OF BREEDING
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publisher
Refereed
True
DOI
Web of Science KeyUT