期刊
THEORETICAL AND APPLIED GENETICS
卷 101, 期 8, 页码 1215-1225出版社
SPRINGER-VERLAG
DOI: 10.1007/s001220051600
关键词
Oryza sativa L.; gene mapping; Magna porthe grisea; Pyricularia grisea; disease resistance; complete resistance; resistance genes; pyramiding; RFLP
A framework linkage map was developed using 283 F-10 recombinant inbred lines (RILs) from a 'Lemont'x'Teqing' rice cultivar cross. Evaluation of a subset of 245 of these RILs with five races of the rice blast pathogen permitted RFLP mapping of three major resistance genes from Teqing and one major gene from Lemont, All mapped genes were found to confer resistance to at least two blast races, but none conferred resistance to all five races evaluated. RFLP mapping showed that the three resistance genes from Teqing, designated Pi-tq5, Pi-tq1 and Pi-tq6, were present on chromosomes 2, 6 and 12, respectively. The resistance gene from Lemont. Pi-lm2, was located on chromosome 11. Pi-tq1 is considered a new gene, based on its reaction to these five races and its unique map location, while the other three genes may be allelic with previously reported genes. Lines with different gene combinations were evaluated for disease reaction in field plots. Some gene combinations showed both direct effects and non-linear interaction. The fact that some of the lines without any of the four tagged genes exhibited useful levels of resistance in the field plots suggests the presence of additional genes or QTLs affecting the blast reaction segregating in this population.
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