A Trial to Develop Novel Genotypes of Extra-Heavy Panicle Types with Good Grain Filling in Rice

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  • Kato Tsuneo
    Faculty of Biology-Oriented Science and Technology, Kinki University

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  • 登熟良好な新規極穂重型イネ遺伝子型を開発する試み

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Description

The alleles AS2-2 and SUT1-2 at OsAGPS2 and OsSUT1, respectively, were suggested to improve grain filling in extra-heavy panicle type rice. To confirm the suitability of these alleles, this study sought to generate novel genotypes showing much higher number of spikelets per panicle (SP/P) and examined their degree of grain filling. These genotypes were generated by recurrent selection for higher SP/P from F2 to F5 populations derived from a cross between two extra-heavy panicle type rice, Milyang 23 and Nanjing 11. Because both parents contain AS2-2 and SUT1-2, all progenies derived from this cross should have a AS2-2 SUT1-2 genotype. From the change in selection efficiency with successive generations, dominance effects were prevalent in most of panicle traits, including SP/P. Selected lines for SP/P in F6 generation exhibited much higher SP/P than the parents and non-selected lines, which reached >300 SP/P in the best line. These selected lines also showed higher proportions of well-filled grains (specific gravity >1.15) than cultivars with AS2-1 SUT1-1 genotype, indicating clearly that the alleles for good grain filling, AS2-2 and SUT1-2, should sufficiently improve grain filling even with the greatly enlarged sink capacity of rice panicle. The necessity for improvement in source strength etc. was also suggested to improve grain filling with further increased numbers of SP/P.

Journal

  • Journal of Crop Research

    Journal of Crop Research 58 (0), 15-20, 2013

    The Society of Crop Science and Breeding in Kinki, Japan

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