Genetic and breeding studies of near-isogenic lines of IR64 for yield-related traits: variation in agronomic characteristics
2007
Santos, R.E.M. | Fujita, D. | Ebron, L. | Yanoria, M.J.T., International Rice Research Inst., DAPO Box 7777, Metro Manila (Philippines) | Kato, H., National Inst. of Crop Science, 2-1-18Kannondai, Tsukuba Ibaraki, 305-8518 (Japan) | Kobayashi, S., NARC for Hokkaido Region, 1 Hitsujigaoka Sapporo, Hokkaido, 062-8555 (Japan) | Uga, Y., NIAS, 2-1-2, Kanondai, Tsukuba, Ibaraki, 305-8602 (Japan) | Araki, E., NARO for Western Region, 6-12-1 Nishifukatso, Fukuyama, Hiroshima 721-8514 (Japan) | Takai, T., NIAS, 2-1-2, Kanondai, Tsukuba, Ibaraki, 305-8602 (Japan) | Fukuta, Y., Japan International Center for Agricultural Sciences, 1-1 Ohwashi, Tsukuba, Ibaraki, 305-8686 (Japan) | Kobayashi, N., International Rice Research Inst., DAP Box 7777, Metro Manila (Philippines)
Under the IRRI-Japan Collaborative Research Project, the authors have been developing near-isogenic lines (NILs) of rice in the genetic background of Indica-type variety IR64 as suitable breeding materials for water-saving cultivation. Eleven donor varieties (Mostly new plant types or Japonica-type elite cultivars) that differ in agronomic characteristics were backcrossed to IR64 to produce the BC3F1 generation. The BC3F1 progenies were self-pollinated and 350 NILs were produced. The NILs were evaluated in the field for differences in heading time, panicle length, culm length, leaf width, leaf length, number of tillers, grain number per panicle, hundred seed weight, and other unique agronomic characteristics. Variations in agronomic traits were observed between IR64 and the NILs. Days to heading ranged from 71 to 108 d (IR64:85 d), panicle length ranged from 18 cm to 30 cm (IR64:24 cm) culm length ranged from 48 cm to 81 cm (IR64:64 cm), leaf width ranged from 1.0 cm to 1.7 cm (IR64:1.2 cm), leaf length ranged from 22 cm to 43 cm), and number of tillers ranged from 12 to 31 (IR64:20). Genetic analyses were performed using SSR markers to confirm the introgression of segments contributing to the unique agronomic traits in the NILs. Based on the results of genetic characterization of phenotypic evaluation, promising NILs that can be used as breeding lines, experimental materials or varieties were identified.
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