Author
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LIU, GUANGJIE - Texas Agrilife Research |
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Jia, Yulin |
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Submitted to: Symposium Proceedings
Publication Type: Abstract Only Publication Acceptance Date: 8/5/2010 Publication Date: 8/12/2010 Citation: Liu, G., Jia, Y. 2010. Mapping quantitative trait loci of rice to blast using physiological races of the fungus [abstract]. 5th International Rice Blast Conference, August 12-14, 2010, Little Rock, Arkansas. Poster Abstract IV-P-56. Interpretive Summary: Technical Abstract: It has known for sometime that genetic resistance to blast caused by Magnaporthe oryzae are controlled by major resistance (R) and minor resistance genes. Minor resistance genes each of them providing different extent of resistance have been identified on different rice chromosome as quantitative trait loci (QTLs). The qualitative data converted from category scale have been successfully used to map and clone major blast R genes worldwide. In the present study, we mapped blast resistant QTLs using composite interval mapping with the six races IB1, IB45, IB49, IB54, IC17, and ID1 of M. oryzae using a recombinant inbred line (RIL) population derived from a cross of the moderately- susceptible japonica cultivar Lemont with the moderately- resistant indica cultivar Jasmine 85. Disease reactions of 227 RILs were evaluated using a category scale of ratings from 0, representing the most resistant, to 5, representing the most susceptible. The category data we collected were used for mapping resistant QTLs. A total of eight QTLs responsive to different degrees of phenotypical variation ranging from 5.2 to 26.5% were identified on chromosomes 3, 8, 9, 11, and 12. This study demonstrates the usefulness of studying blast QTLs using physiological races by multiple interval mapping under greenhouse condition |
