数字农科院2.0

Genetic location and evaluation of chromosomal segments for drought tolerance at flowering stage in maize using selected backcross populations

文献类型： 外文期刊

作者： Li, Y.;Shi, Y.;Song, Y.;Wang, T.;Li, Y.;Liu, C.

作者机构：

关键词： drought tolerance;flowering stage;backcross population;genetic location;chromosomal segment;introgression frequency

期刊名称： PLANT BREEDING

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收录情况： SCI

摘要： Development and evaluation of introgression lines have become one of the promising approaches to understanding genetic mechanisms of important traits in crops. In this study, three sets of drought tolerance (DT) selected backcross populations in maize, including two BC2S1 populations and one BC3S1 population, from a cross of Qi319 and Huangzaosi (recurrent parent) were developed by selecting for short anthesis-silking interval (ASI) under the condition of serious water stress at flowering stage. The introgression of chromosome segments was identified using microsatellite markers. The results showed that the marker allele introgression frequencies in the three DT populations significantly increased compared with the expected value under no selection. There was a notable increase of introgression frequency for the most of these markers which were located on all chromosomes except chromosome 8, but most concentrated on some chromosomes, especially on chromosomes 4 and 5. For example, chromosome 4 harboured the largest number of introgression regions, on which five segments were detected. The ASI in the DT populations significantly shortened compared with the initial BC2 population.

分类号： S3

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