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Genetic location and evaluation of chromosomal segments for drought tolerance at flowering stage in maize using selected backcross populations
Author(s) -
Li Y.,
Liu C.,
Shi Y.,
Song Y.,
Wang T.,
Li Y.
Publication year - 2009
Publication title -
plant breeding
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.583
H-Index - 71
eISSN - 1439-0523
pISSN - 0179-9541
DOI - 10.1111/j.1439-0523.2009.01666.x
Subject(s) - introgression , biology , backcrossing , population , chromosome , genetics , microsatellite , anthesis , allele , quantitative trait locus , botany , gene , cultivar , demography , sociology
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 BC 2 S 1 populations and one BC 3 S 1 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 BC 2 population.