Inheritance of a Thermo-sensitivity Gene Controlling Flower Initiation in Sorghum
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概要
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The existence of a sorghum (Sorghum bicolor Moench) thermo-sensitivity gene has been proposed to account for the acceleration of flower initiation when plants are exposed to a temperature lower than 20℃. Four varieties and their F_1, F_2, F_3 and BC1F, populations were evaluated for days to emergence of flag leaf (DEFL) under the field condition of a long daylength (>13 h) and temperatures over 20℃ for at least 40 days after sowing. The F_1, hybrids, Hiromidori (Norin Ko-2): 390 (early) × Regs.Hegari (late) and Natsuibuki (Norin Ko-9) MS175 (late) × Daikoukaku (early), showed the same flowering response as Regs.Hegari and MS175 which show a delay in DEFL under temperatures over 20℃, suggesting the presence of a dominant thermo-sensitivity gene. In two different F_2 populations, the segregation of early and late plants for DEFL fitted in with the expected ratio of 1:3, indicating that a single dominant gene was controlling the phenotype. The inheritance mode was confirmed in two different BC_1F_1 populations, where the expected ratio of 1:1 (early late) wasobserved in the segregation of BC_1F1 of 390 × F_1 and F_1 × Daikoukaku. As expected, no segregation was observed in BC_1F_1 populations of F_1 × Regs.Hegari and MS175 × F_1. These results suggest that the sorghum thermo-sensitivity for flower initiation is controlled by a monogenic dominant gene of late over early, and the symbol TT is assigned to the genotype in which flower initiation is accelerated by the exposure to a temperature lower than 20℃.
- 日本育種学会の論文
著者
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Morikawa Toshinobu
Laboratory Of Genetics And Plant Breeding College Of Agriculture
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Morikawa Toshinobu
Laboratory Of Genetics And Plant Breeding Graduate School Of Agriculture And Biological Sciences Osa
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Tarumoto I
Graduate School Of Agriculture And Life Sciences Osaka Prefecture University
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Tarumoto Isao
Laboratory Of Genetics And Plant Breeding Graduate School Of Agriculture And Biological Sciences Osa
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Yanase M
Graduate School Of Life And Environmental Sciences Osaka Prefecture University
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Yanase Masanori
Laboratory Of Genetics And Plant Breeding Graduate School Of Agriculture And Biological Sciences Osa
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KASUGA Shigemitsu
Faculty of Agriculture, Shinshu University
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Iwahara Youko
Laboratory of Genetics and Plant Breeding, Graduate School of Agriculture and Biological Sciences, O
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Kuzumi Youhei
Laboratory of Genetics and Plant Breeding, Graduate School of Agriculture and Biological Sciences, O
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Kasuga Shigemitsu
Nagano Animal Industry Experiment Station
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Kuzumi Youhei
Laboratory Of Genetics And Plant Breeding Graduate School Of Agriculture And Biological Sciences Osa
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Iwahara Youko
Laboratory Of Genetics And Plant Breeding Graduate School Of Agriculture And Biological Sciences Osa
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Kasuga S
Faculty Of Agriculture Shinshu University
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