PJB-1969-16
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)
K. A. SlDDIQUI
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 penta- ploids and 34-chromosome plants recovered from the first back cross.
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