Plant Protection Bulletin (Taipei) (2003) 45, 211-223

T.H. Tseng, C.H. Cheng, C.G. Chern, S.M. Yen, T.L. Jeng, W.S. Jwo and C.S. Wang (2003)
[Response and genetic analysis of borown planthopper resistance in rice mutants of the TNG67 variety]
Plant Protection Bulletin (Taipei) 45 (3), 211-223
Abstract: Pure line mutants from the mutation pools of the TNG67 rice variety derived from seed mutagenesis using sodium azide were subjected to brown planthopper (BPH) challenge by the bulk-seedling method. About 9.6%-12.5%, 3.4%, and 7.7% of the mutants from the first mutation pool showed resistance (score < 3) to Race 1, Race 2, and Race 3 of BPH, respectively. Among them, 6 mutants (SA0006, SA0038, SA0080, SA0088, SA0159, and SA0283) were resistant to all races of BPH tested. In the second mutation pool, about 19.2%-26.0% of mutants showed resistance to BPH Race 1. Our experiments demonstrated that sodium azide produced a significant mutagenesis effect on inducing resistance to TNG67, a BPH-susceptible variety, at a rather high rate. A genetic study of BPH resistance of mutants SA0006 and SA0285 was conducted by crossing to the susceptible varieties TNG67 and TK2; the segregation of resistant (R) to susceptible (S) progenies in F2 or BC1F1 was 3:1 and 1:1, respectively, suggesting that the resistance was controlled by a single dominant gene. Significant segregations were observed in the F2 of crosses made between the resistant mutants (SA0006, SA0007, SA0236, SA0283, SA0284, and SA0285), Mudgo (Bph1), and Babawee (bph4) indicating that their resistant genes are distinct. BPH responses in F3 of half-diallelic crosses made among 6 BPH-resistant mutants and 2 varieties, TNG67 (S) and TNG69 (R), showed that all crosses derived from TNG67 as their mother parents produced only 1/4 susceptible progeny, except that of SA0235 (88%), indicating that a single dominant gene was individually involved. Segregation of the BPH response was found in 21 F₃ populations of crosses made between the resistant lines suggesting that the resistant genes of parents differ; however, progeny of 7 populations were all resistant to BPH, indicating that parents have the same resistant genotype. The BPH-resistant mutants obtained in this experiment provide good resources for resistant gene cloning and for breeding BPH-resistant rice varieties.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: Chinese)
Database assignments for author(s): Chang-Sheng Wang

Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Nilaparvata lugens	Rice (Oryza)	Taiwan