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OsLG1 regulates a closed panicle trait in domesticated rice
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Journal Article
OsLG1 regulates a closed panicle trait in domesticated rice
2013
Overview
Takashige Ishii and colleagues report that the closed panicle phenotype in the cultivated rice,
Oryza sativa
, is controlled by the
OsLG1
gene. Closed panicles lead to higher seed retention, and the authors show evidence for selection at this locus during rice domestication.
Reduction in seed shattering was an important phenotypic change during cereal domestication
1
,
2
. Here we show that a simple morphological change in rice panicle shape, controlled by the
SPR3
locus, has a large impact on seed-shedding and pollinating behaviors. In the wild genetic background of rice, we found that plants with a cultivated-like type of closed panicle had significantly reduced seed shedding through seed retention. In addition, the long awns in closed panicles disturbed the free exposure of anthers and stigmas on the flowering spikelets, resulting in a significant reduction of the outcrossing rate. We localized the
SPR3
locus to a 9.3-kb genomic region, and our complementation tests suggest that this region regulates the liguleless gene (
OsLG1
). Sequencing analysis identified reduced nucleotide diversity and a selective sweep at the
SPR3
locus in cultivated rice. Our results suggest that a closed panicle was a selected trait during rice domestication.
Publisher
Nature Publishing Group US,Nature Publishing Group
Subject
