Download e-book for kindle: Chromosome Manipulations and Plant Genetics: The by D. R. Cameron (auth.), Ralph Riley, K. R. Lewis (eds.)

By D. R. Cameron (auth.), Ralph Riley, K. R. Lewis (eds.)

ISBN-10: 148996259X

ISBN-13: 9781489962591

ISBN-10: 1489965610

ISBN-13: 9781489965615

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Additional info for Chromosome Manipulations and Plant Genetics: The contributions to a symposium held during the Tenth International Botanical Congress Edinburgh 1964

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It seems logical, therefore, to consider both Andigena and Tuberosum essentially autotetraploids. (vi) Breeding A very unexpected and pIe asant surprise was the tuber yield of many Phureja-haploid F 1 hybrids. These hybrids substantially outyielded their parents (plate I, fig. 6). Furthermore, the yield of several selections from these 24-chromosome F 1 populations equalled the yield of commercial tetraploid varieties. The majority of the F 1 hybrids (plate I, fig. 7) have undesirable characteristics such as deep eyes, short dormancy, and high tuber sets.

Wöhrmann (1964) also found that temperature did not significantly affect haploid frequency. Results with (2), (3) and (4) were all negative. Haploid frequencies in the range of 35-80 per 100 fruit have been obtained from combinations of elite pollinators and elite seed-parents using the decapitation technique. Up to the present, more than 6300 haploids representing 23 commercial varieties, 45 breeding stocks, and 14 Andigena selections have been obtained as a result of utilising the improved materials and techniques (Gabert, Peloquin, and Hougas, 1964).

Emend. Thell. ssp. vulgare Mac Key variety Chinese Spring (2n = 6x = 42). All the lines employed were ditelocentric, having 20 pairs of normal chromosomes, with median or sub-median centromeres, and one pair of telocentric chromosomes. One arm of the chromosome marked by the telocentric condition was present in the normal double dose, while the other arm was completely deficient. The advantage of such material is that the marked chromosome is readily recognisable, by its distinctive morphology in both mitotic and meiotic metaphase preparations.

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Chromosome Manipulations and Plant Genetics: The contributions to a symposium held during the Tenth International Botanical Congress Edinburgh 1964 by D. R. Cameron (auth.), Ralph Riley, K. R. Lewis (eds.)


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