Performance of Newly Developed Weed-Competitive Rice Cultivars under Lowland and Upland Weedy Conditions

文献类型： 外文期刊

第一作者： Dimaano, Nina Gracel B.

作者： Dimaano, Nina Gracel B.;Sta. Cruz, Pompe C.;Baltazar, Aurora M.;Diaz, Maria Genaleen Q.;Ali, Jauhar;Acero, Bart L., Jr.;Li, Zhikang

作者机构：

关键词： G-6 introgression lines;breeding;weed-competitive ability

期刊名称：WEED SCIENCE （ 影响因子：2.713； 五年影响因子：2.868 ）

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年卷期：

页码：

收录情况： SCI

摘要： Four early-generation backcross populations (BC1F2) derived from one common recipient parental background, Weed Tolerant Rice 1 ('WTR1'), and four different donor parents ('Y134', 'Thong 143', 'Khazar', and 'Cheng Hui-448') were tested to identify suitable donor and recipient parents for weed competitiveness and to standardize evaluation of the weed-competitive ability in rice. 'GSR IR2-6' (G-6) derived from a backcross of WTR1/Y134//WTR1 was selected as the best population and was advanced for phenotypic experiments in the 2014 dry season. The introgression lines (ILs) derived from the G-6 population were evaluated for seed germination and seedling vigor in greenhouse conditions and for weed-competitive ability under field conditions (upland weed-free, upland weedy, and lowland weedy). Parents and checks were included for comparison. Selection pressure for weed competitiveness was relatively stronger in upland conditions than in lowland conditions. After three rounds of selection and based on their relative grain yield performances across conditions, a total of 21 most-promising introgression fixed lines showing superior traits and weed-competitive ability were identified. G-6-L2-WL-3, G-6-RF6-WL-3, G-6-L15-WU-1,G-6-Y16-WL-2, and G-6-L6-WU-3 were the top ILs in lowland weedy conditions, whereas G-6-Y7-WL-3, G-6-Y6-WU-3, G-6-Y3-WL-3, and G-6-Y8-WU-1 were the highest yielding in upland weedy conditions. The use of weed-competitive rice cultivars in African and Asian countries will be a highly effective strategy to reduce production costs and provide alternative solutions to the unavailability of herbicides. Competitive rice varieties will also significantly improve grain yields in aerobic rice systems and can become an important strategy for successful upland rice production.

分类号： S451

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