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COMBINING ABILITY ESTIMATES IN 5X5 DIALLEL INTRAHIRSUTUM CROSSES

MOHAMMED JURlAL BALOCH, HIDAYATULLAH BHUTTO, REHMATULLAH RIND* AND GHULAM HUSSAIN TUNIO

Abstract: A study was carried out to determine general and specific combining abilities of seed cotton yield, of bolls, sympodial branches, ginning outturn percent, seed and lint indices from 5x5 diallel intraI crosses. Qalandari was the best general combiner of the parents studied for seed cotton yield and of bolls followed by K-68-9. Parent Acala SJI which had the poorest general combining ability for yield and number of bolls, was the top parent for ginning outturn percent and seed and lint indices. The that formed the best general combining ability did not always form best specific combining ability with every other parents, however, Qalandri with highest general combining ability estimate also ranked first in specific combination with NIAB-78. The regression of observed vs expected values suggested the importance of specific combining ability (control of dominant genes) for seed cotton yield and seed and lint indices, "aeneral combining ability (control of additive genes) for number of bolls, sympodial branches and gining outtum percentage. The consistency in estimates of Combining ability for bolts and yield indicate that selection based on number of bolls will result in simultaneous improvement in cotton yield.

Cotton Research Institute, Sakrand, Sindh, Pakistan.
Sindh Agriculture, University, Tandojam, Pakistan.