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HEREDITAS ›› 2012, Vol. 34 ›› Issue (11): 1379-1389.doi: 10.3724/SP.J.1005.2012.01379

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Major domestication traits in Asian rice

OU Shu-Jun1, 2, WANG Hong-Ru2, CHU Cheng-Cai2   

  1. 1. School of Bioscience Bioengineering, South China University of Technology, Guangzhou 510006, China 2. State Key Laboratory of Plant Genomics, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China
  • Received:2012-04-17 Revised:2012-07-06 Online:2012-11-20 Published:2012-11-25
  • Contact: Chengcai Chu E-mail:ccchu@genetics.ac.cn

Abstract: Rice (Oryza sativa L.) is an excellent model plant in elucidation of cereal domestication. Loss of seed shattering, weakened dormancy, and changes in plant architecture were thought to be three key events in the rice domestication and creating the high-yield, uniform-germinating, and densely-planting modern rice. Loss of shattering is considered to be the direct morphological evidence for identifying domesticated rice. Two major shattering QTLs, Sh4 and qSH1, have displayed different domestication histories. Weakened seed dormancy is essential for synchronous germination in agricultural production. Genes Sdr4, qSD7-1, and qSD12 impose a global and complementary adaptation strategies in controlling seed dormancy. The prostrate growth habit of wild rice is an adaptation to disturbed habitats, while the erect growth habit of rice cultivars meet the needs of compact planting, and such a plant architecture is mainly controlled by PROG1. The outcrossing habit of wild rice promotes propagation of domestication genes among dif-ferent populations, while the self-pollinating habit of cultivated rice facilitates fixation of domestication genes. Currently, the researches on rice domestication mainly focus on individual genes or multiple neutral markers, and much less attention has been paid to the evolution of network controlling domestication traits. With the progress in functional genomics re-search, the molecular mechanism of domestication traits is emerging. Rice domestication researches based on network will be more comprehensive and better reflect rice domestication process. Here, we reviewed most progresses in molecular mechanisms of rice domestication traits, in order to provide the new insights for rice domestication and molecular breeding.

Key words: rice domestication trait, shattering, dormancy, plant architecture, functional genomics