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Title of Journal: Plant Mol Biol

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Abbravation: Plant Molecular Biology

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Springer Netherlands

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DOI

10.1016/0006-2952(58)90008-x

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ISSN

1573-5028

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Emphasis Type="Italic"Dwarf 88/Emphasis a nov

Authors: Zhenyu Gao Qian Qian Xiaohui Liu Meixian Yan Qi Feng Guojun Dong Jian Liu Bin Han
Publish Date: 2009/07/15
Volume: 71, Issue: 3, Pages: 265-276
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Abstract

Rice architecture is an important agronomic trait that affects grain yield We characterized a tillering dwarf mutant d88 derived from Oryza sativa ssp japonica cultivar Lansheng treated with EMS The mutant had excessive shorter tillers and smaller panicles and seeds compared to the wildtype A reduction in number and size of parenchyma cells around stem marrow cavity as well as a delay in the elongation of parenchyma cells caused slender tillers and dwarfism in the d88 mutant The D88 gene was isolated via mapbased cloning and identified to encode a putative esterase The gene was expressed in most rice organs with especially high levels in the vascular tissues The mutant carried a nucleotide substitution in the first exon of the gene that led to the substitution of arginine for glycine which presumably disrupted the functionally conserved Nmyristoylation domain of the protein The function of the gene was confirmed by complementation test and antisense analysis D88 thus represents a new category of genes that regulates cell growth and organ development and consequently plant architecture The potential relationship between the tiller formation associated genes and D88 is discussed and future identification of the substrate for D88 may lead to the characterization of new pathways regulating plant development

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