Volume 17, No 5, May 2007
ISSN: 1001-0602
EISSN: 1748-7838 2018
impact factor 17.848*
(Clarivate Analytics, 2019)
Volume 17 Issue 5, May 2007: 402-410
ORIGINAL ARTICLES
LAZY1 controls rice shoot gravitropism through regulating polar auxin transport
Peijin Li1,*, Yonghong Wang1,*, Qian Qian2,*, Zhiming Fu1, Mei Wang1, Dali Zeng1,2, Baohua Li1, Xiujie Wang1 and Jiayang Li1
1State Key Laboratory of Plant Genomics and National Center for Plant Gene Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China;
2State Key Laboratory of Rice Biology, China National Rice Research Institute, Chinese Academy of Agricultural Sciences, Hangzhou 310006, China
Correspondence: Jiayang Li(jyli@genetics.ac.cn)
Tiller angle of rice (Oryza sativa L.) is an important agronomic trait that contributes to grain production, and has long attracted attentions of breeders for achieving ideal plant architecture to improve grain yield. Although enormous efforts have been made over the past decades to study mutants with extremely spreading or compact tillers, the molecular mechanism underlying the control of tiller angle of cereal crops remains unknown. Here we report the cloning of the LAZY1 (LA1) gene that regulates shoot gravitropism by which the rice tiller angle is controlled. We show that LA1, a novel grass-specific gene, is temporally and spatially expressed, and plays a negative role in polar auxin transport (PAT). Loss-of-function of LA1 enhances PAT greatly and thus alters the endogenous IAA distribution in shoots, leading to the reduced gravitropism, and therefore the tiller-spreading phenotype of rice plants.
Cell Research (2007) 17:402-410. doi: 10.1038/cr.2007.38; published online 30 April 2007
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