Journal of Taiwan Agricultural Research

Author:Huey-Jiuan Huang, Chang-Pei Li, Chyr-Guan Chern*, Ching-Huan Cheng, Jaw-Shu Hsieh and Shun-Fu Lin

Abstract:

    To detect genes associated with resistance to rice brown planthopper (BPH), linkage map of japonica rice constructed by 160 F_2:4 lines of TNG 69 x Koshihikari population and 135 molecular markers were used. According to the combined analysis of variance across years, the estimated broad sense heretability (h²B) of resistance to BPH was 73.9%. From the phenotypic data investigated in three years, five major quantitative trait loci (QTL) related to resistance to BPH were detected. Two detected QTL were located on linkage group C, and the others were distributed on linkage groups E, G, and H respectively. The QTL located on linkage group G contributing 36.8%~75.8% phenotypic variation was detected with 7.l9~l4.64 LOD values and was closely linked with OPK 16 marker within 4-6 cM. This QTL contributed a recessive allele resistant to BPH from male parent TNG69. The QTL on linkage group H was not detected from single point (General linear model, GLM) test implying a likely inaccurate detection. While the detected QTL on linkage groups C and E had overdominance inheritance for the resistance to BPH. A chromosome region linked to marker OPL9 was detected significantly related resistance to BPH in three years. As a result, the OPK16 and OPL9 markers are useful tools to be applied in marker-assisted-selection (MAS) for varieties resistant to BPH.

Key words:Rice (Oryzae sative), Brown planthopper, Molecular marker

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