Genetic analysis of antixenosis resistance to the common cutworm (Spodoptera litura Fabricius) and its relationship with pubescence characteristics in soybean (Glycine max (L.) Merr.) |
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| Authors: | Nobuhiko Oki Kunihiko Komatsu Takashi Sayama Masao Ishimoto Masakazu Takahashi Motoki Takahashi |
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| Institution: | 1.National Agriculture and Food Research Organization, Kyushu Okinawa Agricultural Research Center, 2421 Suya, Koushi, Kumamoto 861-1192, Japan;2.National Agriculture and Food Research Organization, Hokkaido Agricultural Research Center, 1 Hitsujigaoka, Toyohira, Sapporo, Hokkaido 062-8555, Japan;3.National Institute of Agrobiological Sciences, 2-1-2 Kannondai, Tsukuba, Ibaraki 305-8602, Japan |
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| Abstract: | The common cutworm (CCW, Spodoptera litura Fabricius) is one of the most serious pests of soybean (Glycine max (L.) Merr.). Previously, two quantitative trait loci (QTLs) for antibiosis resistance to CCW, CCW-1 and CCW-2, were detected in the resistant cultivar Himeshirazu. In this study, we conducted an anti-xenosis bioassay using a recombinant inbred population derived from a cross between a susceptible cultivar Fukuyutaka and Himeshirazu to perform QTL analysis. Two QTLs for antixenosis resistance, qRslx1 and qRslx2, were identified on Chrs 7 and 12, and the resistant alleles of qRslx1 and qRslx2 were derived from Himeshirazu and Fukuyutaka, respectively. The position of qRslx1 is similar to that of CCW-1. We also analyzed pubescence characteristics because they have been reported to be associated with soybean insect resistance. Two QTLs for pubescence length (on Chrs 7 and 12) and two QTLs for pubescence density (on Chrs 1 and 12) were identified. The pubescence QTLs on Chrs 7 and 12 were located near qRslx1 and qRslx2, respectively. These results suggest that the antixenosis resistance could be controlled genetically by the identified QTLs and that the pubescence characteristics might contribute to the soybean antixenosis resistance to CCW. |
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| Keywords: | soybean common cutworm quantitative trait locus antixenosis resistance pubescence |
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