いもち病抵抗性の遺伝 (第VII報) 黒禾のいもち病抵抗性遺伝子の分析

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Linkage analysis was carried out on Kuroka blast resistance with pedigrees of Kamenoo of la, lg isogenic line×Kuroka of glume colored with Pr and C. An individual F_3 line was raised from each F_2 without practicing any selection for a particular trait. Selecting homogeneous genotype for ligule, 150 F_4 lines were promoted as follows; two lines from each F_3 of 69 lines and one from each of 12. Existence of a close linkage between lg^+ and one of Kuroka's resistant genes designated as Pi-kur 1 was confirmed among F_2 by the spray inoculation method and its recombination value was estimated as 7.8% and 10.3%. The present gene was ascertained to be the same as the one previously studied by the translocation analysis. The close relation above mentioned was distinctly shown among F_4 lines, too. As 32.4% of lglg lines, 25.4% of susceptible lines, 48.7% of lg^+lg^+ lines and 51.7% of resistant lines belonged to colored glume ones, Pi-kur 1 was assumed to locate between lg and Pr, and very nearly Ph. By then sheath inoculation method, F_2 plants revealed a segregation of two genes. One designated as Pi-kur 2 is commonly effective to used isolates and closely linked with la and the other is a complementary gene particular to each isolate. Pi-kur 2 participated not so much part as Pi-kur 1 in resistance on nursery bed, but its additive effects reached at significant level. There were some F_4 lines evidently more resistant than others among the group susceptible to spray inoculation, and so it was reasonably understood that the breakdown of Kuroka's "rr" grade of field resistance in Japan was limited to intermediate "m" in Philippines.
日本植物病理学会の論文
1988-10-25

いもち病抵抗性の遺伝 (第VII報) 黒禾のいもち病抵抗性遺伝子の分析

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