| Pak. J. Bot., 39(5): 1517-1522, 2007. | Back to Contents | ||||
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Updated: 09-07-09 | ||||
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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. 1Institute of Horticultural Sciences, University of Agriculture, Faisalabad 38040, Pakistan, 2Nuclear Institute of Agriculture & Biology, Faisalabad, Pakistan, 3Dr. A. Q. Khan Institute of Biotechnology and Genetinc Engineering,University of Karachi, Karachi-75270, Pakistan |
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