OsSPL14 promotes panicle branching and higher grain productivity in rice

Miura, Kotaro; Ikeda, Mayuko; Matsubara, Atsushi; Song, Xinbo; Ito, Mizuho; Asano, Katsuaki; Matsuoka, Makoto; Kitano, Hidemi; Ashikari, Motoyuki

doi:10.1038/ng.592

Cited by 933 publications

(778 citation statements)

References 32 publications

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“…In the rice OsSPL14 mutants, the reduced tillering and increased panicle branching is due to the role of the gene during both the vegetative and reproductive phases (Jiao et al, 2010;Miura et al, 2010). The enhanced development of the reproductive structures in tin could be phenocopied by detillering during the vegetative stage, indicating that reduced intraplant competition may be sufficient to enhance the development of the remaining shoot(s).…”

Section: Murraymentioning

confidence: 99%

Inhibition of Tiller Bud Outgrowth in thetinMutant of Wheat Is Associated with Precocious Internode Development

et al. 2012

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Tillering (branching) is a major yield component and, therefore, a target for improving the yield of crops. However, tillering is regulated by complex interactions of endogenous and environmental signals, and the knowledge required to achieve optimal tiller number through genetic and agronomic means is still lacking. Regulatory mechanisms may be revealed through physiological and molecular characterization of naturally occurring and induced tillering mutants in the major crops. Here we characterize a reduced tillering (tin, for tiller inhibition) mutant of wheat (Triticum aestivum). The reduced tillering in tin is due to early cessation of tiller bud outgrowth during the transition of the shoot apex from the vegetative to the reproductive stage. There was no observed difference in the development of the main stem shoot apex between tin and the wild type. However, tin initiated internode development earlier and, unlike the wild type, the basal internodes in tin were solid rather than hollow. We hypothesize that tin represents a novel type of reduced tillering mutant associated with precocious internode elongation that diverts sucrose (Suc) away from developing tillers. Consistent with this hypothesis, we have observed upregulation of a gene induced by Suc starvation, downregulation of a Suc-inducible gene, and a reduced Suc content in dormant tin buds. The increased expression of the wheat Dormancy-associated (DRM1-like) and Teosinte Branched1 (TB1-like) genes and the reduced expression of cell cycle genes also indicate bud dormancy in tin. These results highlight the significance of Suc in shoot branching and the possibility of optimizing tillering by manipulating the timing of internode elongation.

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Section: Murraymentioning

confidence: 99%

Inhibition of Tiller Bud Outgrowth in thetinMutant of Wheat Is Associated with Precocious Internode Development

et al. 2012

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“…Epialleles have been reported in several plant species, including maize (Brink, 1956;Banks et al, 1988;Das and Messing, 1994;Hollick and Chandler, 2001) and rice (Miura et al, 2009(Miura et al, , 2010Wang et al, 2010;Zhang et al, 2012;Li et al, 2014). The phenotypes of these epialleles are affected by DNA methylation status and/or histone modification resulting in the alteration of gene expression.…”

Section: Dna Methylation Of Kala4mentioning

confidence: 99%

The Birth of a Black Rice Gene and Its Local Spread by Introgression

et al. 2015

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The origin and spread of novel agronomic traits during crop domestication are complex events in plant evolution. Wild rice (Oryza rufipogon) has red grains due to the accumulation of proanthocyanidins, whereas most cultivated rice (Oryza sativa) varieties have white grains induced by a defective allele in the Rc basic helix-loop-helix (bHLH) gene. Although the events surrounding the origin and spread of black rice traits remain unknown, varieties with black grains due to anthocyanin accumulation are distributed in various locations throughout Asia. Here, we show that the black grain trait originated from ectopic expression of the Kala4 bHLH gene due to rearrangement in the promoter region. Both the Rc and Kala4 genes activate upstream flavonol biosynthesis genes, such as chalcone synthase and dihydroflavonol-4-reductase, and downstream genes, such as leucoanthocyanidin reductase and leucoanthocyanidin dioxygenase, to produce the respective specific pigments. Genome analysis of 21 black rice varieties as well as red-and white-grained landraces demonstrated that black rice arose in tropical japonica and its subsequent spread to the indica subspecies can be attributed to the causal alleles of Kala4. The relatively small size of genomic fragments of tropical japonica origin in some indica varieties indicates that refined introgression must have occurred by natural crossbreeding in the course of evolution of the black trait in rice.

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“…This is the highest in all cereal crops. Although it is not apparent whether further increase in the harvest index is feasible (Miura et al, 2010), to substantially enhance yield in both crops will be difficult unless source capacity including photosynthesis is improved by genetic engineering. In addition, since improving source capacity could lead to a decrease in the amount of N required for a high yield, it will reduce the environmental impact of agriculture.…”

Section: Crop Yieldmentioning

confidence: 99%