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Cytogenetical studies in the oryzeae

III. Cytogenetical behaviour of an interspecific hybrid inOryza

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VIII. Summary

An interspecific hybrid betweenOryza sativa ×O. officinalis was obtained for the first time. The plant was intermediate in character between the two parents and was highly sterile.

The meiosis in the hybrid is described. The parental chromosomes failed to pair in meiosis. Irregular division and distribution of univalents at both divisions generally resulted in abnormal pollen. In certain cells, however, the univalents appeared to divide regularly at both the divisions, presumably giving rise to diploid gametes.

Six plants resulting from back-crosses of theF 1 with one of the parents,O. sativa, all proved to be triploids, thereby showing that diploid gametes are occasionally formed by double division of all the univalent chromosomes.

The meiosis in these plants was extremely abnormal. Coalescence and degeneration of P.M.C. was frequent. Formation of restitution nuclei, failure of septa formation in the P.M.C., suppression of the first division and other abnormalities were also frequently met with.

The formation of diploid gametes and the origin of polyploidy is discussed with special reference to their occurrence in rice.

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  1. Botany Department, University of London, King’s College, UK

    S. Ramanujam

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Part III of thesis approved for the degree of Doctor of Philosophy in the University of London.

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Ramanujam, S. Cytogenetical studies in the oryzeae. Journ. of Genetics 35, 223–258 (1937). https://doi.org/10.1007/BF02982352

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