Natural Variations at TIG1 Encoding a TCP Transcription Factor Contribute to Plant Architecture Domestication in Rice.

Authors:
Weifeng Zhang
Weifeng Zhang
Henan University
China
LuBin Tan
LuBin Tan
China Agricultural University
China
Hongying Sun
Hongying Sun
Jiangsu Key Laboratory for Biodiversity and Biotechnology
Nanjing Shi | China
XinHui Zhao
XinHui Zhao
Laser Information Technology Research Center
Fengxia Liu
Fengxia Liu
China Agricultural University
China
Hongwei Cai
Hongwei Cai
China Agricultural University
China
Yongcai Fu
Yongcai Fu
China Agricultural University
China
Xianyou Sun
Xianyou Sun
China Agricultural University
China

Mol Plant 2019 Apr 16. Epub 2019 Apr 16.

State Key Laboratory of Plant Physiology and Biochemistry, China Agricultural University, Beijing 100193, China. Electronic address:

The modification of plant architecture is a crucial target in rice domestication and modern genetic improvement. Although several genes regulating rice plant architecture have been characterized, the molecular mechanisms underlying rice plant architecture domestication remain largely unclear. Here we show that the inclined tiller growth in wild rice is controlled by a single dominant gene, TILLER INCLINED GROWTH 1 (TIG1), which is located on chromosome 8 and encodes a TCP transcriptional activator. TIG1 is primarily expressed in the adaxial side of the tiller base, promotes cell elongation, and enlarges the tiller angle in wild rice. Variations in the TIG1 promoter of indica cultivars (tig1 allele) resulted in decreased expression of TIG1 in the adaxial side of tiller base and reduced cell length and tiller angle, leading to the transition from inclined tiller growth in wild rice to erect tiller growth during rice domestication. TIG1 positively regulates the expression of EXPA3, EXPB5, and SAUR39 to promote cell elongation and increase the tiller angle. Selective sweep analysis revealed that the tig1 allele was selected in indica cultivars by human beings. The cloning and characterization of TIG1 supports a new scenario of plant architecture evolution in rice.

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Source
http://dx.doi.org/10.1016/j.molp.2019.04.005DOI Listing
April 2019

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