Viability and Germination Inhibitor of the Seed of Rice

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THE loss of viability of seeds within one year after harvesting has been reported by Grist1 from varieties of rice grown in British Guiana and by Ramiah2 in India, but no explanation has been offered. Germination tests of a winter variety ‘Rupsail’ recently carried out in this laboratory indicated peak germination during March–June following harvesting in December ; thereafter it declined and from November onwards the viability was lost. Seeds harvested in 1953 and 1957 failed to germinate in 1959. The excised embryos from fresh seeds of 1958 germinated only in White's nutrient agar media while those of one- or five-year old seeds did not grow. Respiration-rates measured by Warburg apparatus indicated higher rates in fresh seeds than the old ones (Table 1).

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  1. 1

    Grist, D. H., “Rice” (Longmans, Green and Co., London, 1954).

  2. 2

    Ramiah, K., “Rice Breeding and Genetics”, Sci. Mono. No. 19 (Indian Council of Agricultural Research, New Delhi, India, 1953).

  3. 3

    Toole, E. H., Hendricks, S. B., Borthwick, H. A., and Toole, Vivian K., “Ann. Rev. Plant Physiol.”, 7, 299 (1956).

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SIRCAR, S., BISWAS, M. Viability and Germination Inhibitor of the Seed of Rice. Nature 187, 620–621 (1960) doi:10.1038/187620b0

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