Plant Diversity ›› 2018, Vol. 40 ›› Issue (05): 238-244.DOI: 10.1016/j.pld.2018.09.001

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Mapping and breeding value evaluation of a semi-dominant semidwarf gene in upland rice

Xiaoqian Chena,b, Peng Xua, Jiawu Zhouc, Dayun Taoc, Diqiu Yua   

  1. a Key Laboratory of Tropical Plant Resources and Sustainable Use, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Kunming, Yunnan, 650223, China;
    b University of Chinese Academy of Sciences, Beijing, 100049, China;
    c Food Crops Research Institute, Yunnan Academy of Agricultural Sciences(YAAS), Kunming, 650200, China
  • Received:2018-05-17 Online:2018-10-25 Published:2018-11-07
  • Contact: Dayun Tao, Diqiu Yu
  • Supported by:

    This research was partially funded by grants from National Natural Science Foundation of China (31360330) and Chinese Academy of Science (XDA08020203).


Plant height is an important trait related to yield potential and plant architecture. A suitable plant height plays a crucial role in improvement of rice yield and lodging resistance. In this study, we found that the traditional upland landrace ‘Kaowenghan’ (KWH) showed a special semi-dwarf phenotype. To identify the semi-dwarf gene from KWH, we raised BC2F4 semi-dwarf introgression lines (IL) by hybridization of the japonica rice cultivar ‘Dianjingyou1’ (DJY1) and KWH in a DJY1 background. The plant height of the homozygous semi-dwarf IL (IL-87) was significantly reduced compared with that of DJY1. The phenotype of the F1 progeny of the semi-dwarf IL-87 and DJY1 showed that the semi-dwarf phenotype was semidominant. QTL mapping indicated that the semi-dwarf phenotype was controlled by a major QTL qDH1 and was localized between the markers RM6696 and RM12047 on chromosome 1. We also developed near-isogenic lines (NIL) from the BC3F3 population, and found that the yield of homozygous NIL (NIL-2) was not significantly different compared to DJY1. Breeding value evaluation through investigation of the plant height of the progeny of NIL (NIL-2) and cultivars from different genetic background indicate that the novel semi-dwarf gene shows potential as a genetic resource for rice breeding.

Key words: Semi-dwarf, QTL mapping, Breeding value evaluation