Genetic Analysis on Characteristics to Measure Drought Resistance Using Dongxiang Wild Rice (Oryza rufupogon Griff.) and Its Derived Backcross Inbred Lines Population at Seedling Stage

文献类型: 外文期刊

第一作者: Hu Biao-lin

作者: Hu Biao-lin;Zhang Tao;Wan Yong;Li Xia;Xie Jian-kun;Hu Biao-lin;Fu Xue-qin;Huang Yun-hong;Dai Liang-fang;Luo Xiang-dong;Xie Jian-kun

作者机构:

关键词: Dongxiang wild rice (DXWR);drought resistance;principal component analysis (PCA);drought comprehensive index;seedling stage

期刊名称:AGRICULTURAL SCIENCES IN CHINA ( 影响因子:0.82; 五年影响因子:0.997 )

ISSN: 1671-2927

年卷期: 2011 年 10 卷 11 期

页码:

收录情况: SCI

摘要: Drought stress is one of the major constraints to rice (Oryza sativa L.) production and yield stability especially in rainfed ecosystems and is getting worse as the climate changes worldwide. Dongxiang wild rice (DXWR) Oryza rufipogon Griff., contains drought resistant gene. Improving drought resistance of cultivars is crucial to increase and stabilize rice grain yield via transferring resistant gene from species related to rice. In this paper, four upland rice, sixty backcross inbred lines (BILs) derived from BC1F5 of R974//DXWR/R974, and their parents were employed to evaluate drought-resistance at seedling stage in the greenhouse. Nine straits were recorded for assessment of drought resistance, including Maximum root length (MRL), number of roots (NR), shoot length (SL), dry root weight (DRW), fresh root weight (FRW), root relative water content (RRWC), leaf relative water content (LRWC), level for rolling leaf (LRL), and seedling survivability under repeat drought (SSRD). Using more than 88% of accumulative contribution resulted from the principal component analysis (PCA), the nine traits were classified into five independent principal components and the line 1949 showed the highest resistance. Analysis on the stepwise regression equation and correlation demonstrated that MRL, RN, FRW, and RRWC significantly influenced the drought resistance, thus could be used as comprehensive index for drought resistance at the seedling stage. Using the major gene plus polygene mixed inheritance model of quantitative traits, the inheritance of drought-resistance of BIL population at seedling stage was mostly controlled by two independent genes plus polygene. As a result, the DXWR could be precious resources for genetic improvement of drought resistance in cultivated rice.

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