Building Near-Isogenic Introgression Lines of Elite Maintainer Gangxiang B and Identifying Some Specific Traits  

Yeqing Xiao , Xiaoyan Wu , Lanxiang Hu , Wenchang Wu , Shiyou Luo , Wei Deng , Dazhou Chen
Rice Research Institute, Jiangxi Academy of Agricultural Sciences, Nanchang, 330200, P.R. China
Author    Correspondence author
Rice Genomics and Genetics, 2012, Vol. 3, No. 2   doi: 10.5376/rgg.2012.03.0002
Received: 16 Dec., 2011    Accepted: 17 Jan., 2012    Published: 31 Jan., 2012
© 2012 BioPublisher Publishing Platform
This article was first published in Molecular Plant Breeding in Chinese, and here was authorized to translate and publish the paper in English under the terms of Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Xiao et al., 2012, Building Near-Isogenic Introgression Lines of Elite Maintainer Gangxiang B and Identifying Some Specific Traits, Rice Genomics and Genetics, Vol.3, No.2, 8-12 (doi: 10.5376/rgg.2012.03.0002)


Wild rice is abundant with types of genetic variation formed in the long evolution of natural selection, which contains a great number of favorable genes as well as develops a strong adaptability to the environment. Efficiently exploring the favorable genes of wild rice would be a prerequisite to achieve a breakthrough in rice breeding program. In this research we developed a population consisting of 892 near-isogenic introgression lines (NILs) by crossing and subsequent backcrossing by using eleven wild rice accessions as donors came from different origins and using Gangxiang B as recipient, an elite maintainer to rice cytoplasm male sterility of three-line hybrid system developed by Rice Research Institute of Jiangxi Academy of Agricultural Sciences. There are significant differences of phenotypic traits existing in the populations of the NILs, mainly including Growth period, plant height, tillering ability, panicle shape, grain shape, awn etc. We preliminary identified a batch of materials using the near-isogenic introgression lines we developed in this research, such as materials with drought resistance or high temperature resistance screened under the conditions of drought or high temperature above 35℃, materials with low nitrogen tolerance or blast resistance identified under the conditions of low nitrogen levels or in the prone areas of rice blast, as well as materials with seedling flooding tolerance or herbicide-resistance assessed under the conditions of flooding or spraying of the herbicides such as phosphine glycosides. Using of these excellent materials, we will attempt to pyramid the favorable traits to further improve the features of stress resistance, low nitrogen tolerant capacity and disease resistance in the maintainer of Gangxiang B in order to lay a foundation to achieve the goal of green super rice breeding. In the scanning outcome of large-scale NILs, most of the targeted traits could be identified in the progenies derived from the donors of wild rice, indicating that there should be many favorable genes existing in wild rice.

Rice (Oryza sativa L.); Wild rice (Oryza rufipogon L.); Near-isogenic introgression line; Evaluation of target trait; Maintainer of three-line hybrid rice
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