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Studies on the interspecific hybrid ofPennisetum typhoides×P. Purpureum. IV. The cytogenetics of the allotetraploids

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Summary and Conclusions

  1. 1.

    The morphological characters of several allotetraploids (2n=28) have been described. All of them are perennial.

  2. 2.

    In the mitosis no marked difference was noted in the Karytotypes of the allotetraploid.

  3. 3.

    The meiosis of all the allotetraploids plants derived from back crossing the allohexaploid with the diploid was in the main similar. They all gave trivalents at diakinesis. In the plant derived in the F2 progeny, however, quadrivalents were noted.

  4. 4.

    The hypothetical genomic make up of these plants has been presented. Inspite of the increase in the genomes of the cultivated plant the allotetraploids showed greater resemblance to the wild than to the cultivated ones. The plants are rust resistant under field conditions.

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References

  • Krishnaswamy, N. andV. S. Raman, 1951. Cytogenetical studies in the Interspecific hybrid ofP. typhoides×P. purpureum, Proc. 1st Sci. workers' conf. Dept. Agri. Madras p. 43–71 Supdt. Govt. Press Madras.

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  • Krishnaswamy, N. andV. S. Raman, 1953. Studies on the Interspecific hybrid ofPennisetum typhoides×P. purpureum, II. The cytogenetics of two 22-chromosomed F2 plants. Cytologia, vol. 18; p. 305–321.

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  • Krishnawamy, N. andV. S. Raman, 1954. Studies on the Interspecific hybrid ofPennisetum typhoides×P. purpureum, III. The cytogenetics of the colchinine induced amphidiploid. Genetica, Vol. 27; p. 253–272.

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  • Nordenskiöld, H., 1937. Intra and interspecific hybrids ofPhleum pratense andP. alpinum. Hereditas, XXIII; p. 304.

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  • Plate I, fig. 1–6 allotetraploids, 1. plant I (X 1/12 nat. size); 2. plant IV (1/20); 3. plant VI (1/22); 4. plant VIII (1/20); 5. plant IX (1/16); 6. plant X (1/24). Plate II. Grains (X 2). — 1.P. typhoides, 2.P. purpureum, 3. F1., 4, c-amphidiploid and 5. allotetraploid.

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Authors and Affiliations

  1. Cytogenetics Laboratory, Agricultural College and Research Institute, Coimbatore

    N. Krishnaswamy & V. S. Raman

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  1. N. Krishnaswamy
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  2. V. S. Raman
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Krishnaswamy, N., Raman, V.S. Studies on the interspecific hybrid ofPennisetum typhoides×P. Purpureum. IV. The cytogenetics of the allotetraploids. Genetica 28, 345–360 (1957). https://doi.org/10.1007/BF01694326

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  • DOI: https://doi.org/10.1007/BF01694326

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