PJB-2007-172
FREQUENCY OF TRIPLOIDS IN DIFFERENT INTERPLOIDAL CROSSES OF CITRUS
MUHAMMAD J. JASKANI1, IQRAR A. KHAN2, M.M. KHAN1 AND HAIDER ABBAS3
Abstract
The frequency of triploids in progenies from 2x x 4x and 4x x 2x crosses of Kinnow mandarin and Succari sweet orange was analysed. Chromosome counts indicated that crosses among tetraploid x diploid Kinnow yielded maximum triploids while reciprocal crosses of Kinnow exhibited a mixed population of diploid, triploid and tetraploid seedlings. The occurrence of triploids varied from 25% to 83.4% depending on the pistillate parents used. Crosses of diploid Succari with tetraploid Kinnow also produced nucellar diploid, sexual triploid and tetraploid seedlings. The highest number of tetraploids (71.4%) were produced in cross of tetraploid Kinnow with diploid Succari.
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