Abstract
Rice (Oryza sativa) has the potential to undergo rapid internodal elongation which determines plant height. Gibberellin is involved in internode elongation. Leucine-rich repeat receptor-like kinases (LRR-RLKs) are the largest subfamily of transmembrane receptor-like kinases in plants. LRR-RLKs play important functions in mediating a variety of cellular processes and regulating responses to environmental signals. LRK1, a PSK receptor homolog, is a member of the LRR-RLK family. In the present study, differences in ectopic expression of LRK1 were consistent with extent of rice internode elongation. Analyses of gene expression demonstrated that LRK1 restricts gibberellin biosynthesis during the internode elongation process by down-regulation of the gibberellin biosynthetic gene coding for ent-kaurene oxidase.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Cytochrome P-450 Enzyme System / analysis
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Cytochrome P-450 Enzyme System / genetics*
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Cytochrome P-450 Enzyme System / metabolism
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Down-Regulation
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Gene Expression Regulation, Plant
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Gibberellins / biosynthesis
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Gibberellins / genetics
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Gibberellins / metabolism
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Oligonucleotide Array Sequence Analysis
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Oryza / genetics*
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Oryza / growth & development*
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Oryza / metabolism
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Phenotype
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Plant Proteins / biosynthesis
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Plant Proteins / genetics*
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Plant Proteins / metabolism
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Plants, Genetically Modified
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Protein Kinases / biosynthesis
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Protein Kinases / genetics*
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Protein Kinases / metabolism
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RNA, Messenger / analysis
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RNA, Messenger / metabolism
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Seeds / genetics
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Seeds / growth & development
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Signal Transduction
Substances
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Gibberellins
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Plant Proteins
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RNA, Messenger
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Cytochrome P-450 Enzyme System
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ent-kaurene oxidase
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Protein Kinases