| Pak. J. Bot., 01(1-2): 149-159. | Back to Contents | ||||
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Updated: 17-07-12 | ||||
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EXTRACTION OF ANCESTRAL CONSTITUENTS OF NATURAL POLYPLOIDS. II. STUDY OF
THE FIRST BACKCROSS OF THE PENTAPLOIDS (AABBD) AND 34-CHROMOSOME PLANTS
TO THE HEXAPLOID TRITICUM AESTIVUM (AABBDD)
Abstract:
For the extraction of tetraploid component of a hexaploid the production
and hackcrossing of fertile pentaploids is essential. The first
hackcross of the F\ pentaploids to varieties Chinese Spring, Peko, Koga,
Svenno and A. T. 38 o/Triticum aestivum were made. When the hexaploids
were used as pollen parent, the total seed set was 16 %; in the
reciprocal direction it was 3 %. There were differences in the
crossability of different monosomic lines used and in the survival and
sterility of the pentaploids and 34-chromosome plants recovered from
the first back cross. Atomic Energy Agricultural Research Centre, Tandojam. |
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