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Type: Journal article
Title: DWARF TILLER1, a WUSCHEL-related homeobox transcription factor, is required for tiller growth in rice
Author: Wang, W.
Li, G.
Zhao, J.
Chu, H.
Lin, W.
Zhang, D.
Wang, Z.
Liang, W.
Citation: PLoS Genetics, 2014; 10(3):e1004154-1-e1004154-15
Publisher: Public Library of Science
Issue Date: 2014
ISSN: 1553-7390
Statement of
Wenfei Wang, Gang Li, Jun Zhao, Huangwei Chu, Wenhui Lin, Dabing Zhang, Zhiyong Wang, Wanqi Liang
Abstract: Unlike many wild grasses, domesticated rice cultivars have uniform culm height and panicle size among tillers and the main shoot, which is an important trait for grain yield. However, the genetic basis of this trait remains unknown. Here, we report that Dwarf Tiller1 (DWT1) controls the developmental uniformity of the main shoot and tillers in rice (Oryza sativa). Most dwt1 mutant plants develop main shoots with normal height and larger panicles, but dwarf tillers bearing smaller panicles compared with those of the wild type. In addition, dwt1 tillers have shorter internodes with fewer and un-elongated cells compared with the wild type, indicating that DWT1 affects cell division and cell elongation. Map-based cloning revealed that DWT1 encodes a Wuschel-related homeobox (WOX) transcription factor homologous to the Arabidopsis WOX8 and WOX9. The DWT1 gene is highly expressed in young panicles, but undetectable in the internodes, suggesting that DWT1 expression is spatially or temporally separated from its effect on the internode growth. Transcriptomic analysis revealed altered expression of genes involved in cell division and cell elongation, cytokinin/gibberellin homeostasis and signaling in dwt1 shorter internodes. Moreover, the non-elongating internodes of dwt1 are insensitive to exogenous gibberellin (GA) treatment, and some of the slender rice1 (slr1) dwt1 double mutant exhibits defective internodes similar to the dwt1 single mutant, suggesting that the DWT1 activity in the internode elongation is directly or indirectly associated with GA signaling. This study reveals a genetic pathway synchronizing the development of tillers and the main shoot, and a new function of WOX genes in balancing branch growth in rice.
Keywords: Chromosomes, Plant
Description: Published: March 13, 2014
Rights: © 2014 Wang et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
RMID: 0030023432
DOI: 10.1371/journal.pgen.1004154
Appears in Collections:Agriculture, Food and Wine publications

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