Analysis of rice blast resistance genes by QTL mapping |
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Authors: | Jichen?Xu Jiulin?Wang Zhongzhuan?Ling Email author" target="_blank">Lihuang?ZhuEmail author |
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Institution: | (1) Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, 100101 Beijing, China;(2) Institute of Crop Breeding and Cultivation, Chinese Academy of Agricultural Sciences, 100083 Beijing, China |
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Abstract: | Resistance to rice blast pathogen mostly shows a quantitative trait controlled by several minor genes. Its complexity and
the mutable characteristic of rice blast isolates both hinder the development of the blast resistance research. The article
here tried to explore the resistance gene distribution on rice chromosomes and the way of function. Totally 124 QTLs have
been identified against 20 isolates using Cartographer software with a ZYQ8/JX17 DH population, which separately are at 100
loci of 72 marker intervals on 12 rice chromosomes. Of them, 16 QTLs were determined by the isolate HB-97-36-1. 82 QTLs (66.13%)
are from the resistant parent alleles, ZYQ8, while 42 QTLs (33.87%) are from the susceptible parent alleles, JX17. In comparison
of their positions on chromosome, most QTLs are clustered together and distributed nearby the major genes especially the regions
on chromosomes 1, 2, 8, 10 and 12. Each QTL could account for the resistance variation between 3.52%–68.64%. And, a positional
QTL might display the resistance to several different isolates with different contributions. |
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Keywords: | rice blast disease gene interaction DH population QTL |
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