DWARF TILLER1, a WUSCHEL-Related Homeobox Transcription Factor, Is Required for Tiller Growth in Rice

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Plant architecture is important for crop yield. In most plants, branches grow smaller than the main shoot, largely due to the ‘apical dominance’. However, in several cereal crops, including rice, wheat, and barley, the branches (tillers) have a height and size indistinguishable from the main shoot. The genetic basis of uniform tiller growth has remained elusive. We identified DWARF TILLER1, a WUSCHEL-related homeobox (WOX) transcription factor, as a positive regulator of tiller growth. Most dwt1 mutant plants show normal main shoot but dwarf tillers and reduced panicle size. Tiller growth in dwt1 appears to be inhibited by the main shoot, as removal of the main shoot releases the first tiller. The non-elongating internodes in dwt1 show reduced cell number and cell size, while DWT1 was mainly expressed in the panicles but not internodes, suggesting that DWT1 plays a long distance regulatory role in promoting internode elongation. Genome-wide expression analysis revealed that the expression of genes related to cell division and elongation, as well as to homeostasis and signaling of cytokinin and gibberellin were affected in dwt1 un-elongated internodes. This study reveals that a WOX transcription factor controls the growth uniformity of tillers and the main shoot in rice.

Vyšlo v časopise: DWARF TILLER1, a WUSCHEL-Related Homeobox Transcription Factor, Is Required for Tiller Growth in Rice. PLoS Genet 10(3): e32767. doi:10.1371/journal.pgen.1004154
Kategorie: Research Article
prolekare.web.journal.doi_sk: https://doi.org/10.1371/journal.pgen.1004154

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