Mapping of the QTL (quantitative trait locus) conferring partial resistance to leaf blast in rice cultivar Chubu 32 |
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| Authors: | Zenbayashi K Ashizawa T Tani T Koizumi S |
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| Institution: | (1) National Agricultural Research Center for Tohoku Region, Yotsuya, Omagari, Akita 014-0102, Japan e-mail: kaoruz@affrc.go.jp Fax: +81-0287-66-2639, JP;(2) Aichi Prefectural Agriculture Research Center, Nagakute, Aichi 480-1193, Japan, JP |
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| Abstract: | The rice cultivar Chubu 32 possesses a high level of partial resistance to leaf blast. The number and chromosomal location
of genes conferring this resistance were detected by restriction fragment length polymorphism (RFLP) linkage mapping and quantitative
trait locus (QTL) analysis. For the mapping, 149 F3 lines derived from the cross between rice cultivar Norin 29, with a low level of partial resistance, and Chubu 32 were used,
and their partial resistance to leaf blast was assessed in upland nurseries. A linkage map covering six chromosomes and consisting
of 36 RFLP markers was constructed. In the map, only one significant QTL (LOD>2.0) for partial resistance was detected on
chromosome 11. This QTL explained 45.6% of the phenotypic variation. The segregation ratio of the F3 lines was 3:1 for partial
resistance to susceptibility. These results suggest that the partial resistance in Chubu 32 is controlled by a major gene.
Received: 15 March 2001 / Accepted: 13 August 2001 |
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| Keywords: | Rice (Oryza sativa) Leaf blast Partial resistance Restriction fragment length polymorphism (RFLP) Quantitative trait locus (QTL) |
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