Inhibiting Gene For A Late-Heading Gene Responsible For Photoperiod Sensitivity In Rice (Oryza Sativa)

• Main Authors: Amol Dahal, Hori, Shunsuke, Nakazawa, Haruki, Onishi, Kazumitsu, Kawano, Toshio, Murai, Masayuki
• Format: Text
• Language: English
• Published: Zenodo 2013
• Subjects: Basic vegetative phase; heading time; lateness gene; photoperiod-sensitive phase.; Malangen
• Online Access: https://dx.doi.org/10.5281/zenodo.1087334; https://zenodo.org/record/1087334

Two indica varieties, IR36 and ‘Suweon 258’ (“S”) are middle-heading in southern Japan. 36U, also middle-heading, is an isogenic line of IR36 carrying Ur1 (Undulate rachis-1) gene. However, late-heading plants segregated in the F2 population from the F1 of S × 36U, and so did in the following generations. The concerning lateness gene is designated as Ex. From the F8 generation, isogenic-line pair of early-heading and late-heading lines, denoted by “E” (ex/ex) and “L” (Ex/Ex), were developed. Genetic analyses of heading time were conducted, using F1s and F2s among L, E, S and 36U. The following inferences were drawn from the experimental results: 1) L, and both of E and 36U harbor Ex and ex, respectively; 2) Besides Ex, S harbors an inhibitor gene to it, i.e. I-Ex which is a novel finding of the present study. 3) Ex is a dominant allele at the E1 locus. : {"references": ["", "F. Kubota, N. Tanaka, and S. 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