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Abstract

Studies were carried out for comparing the magnitude of heterotic expression in F1 hybrids from two ploidy levels i.e., pentaploid x tetraploid and tetraploid x tetraploid. The pentaploid hybrids expressed 22.18% average heterosis over mid parents whereas corresponding value in tetraploid hybrids was 14.17% for plant height. With respect of mid-lobe leaf length, the average increase of pentaploid hybrids against mid and better parents respectively were 22.82 and 6.30% while the corresponding values in tetraploid hybrids were 8.46 and 7.02%. In case of mid-lobe leaf width, pentaploid hybrids on an average, expressed heterosis of 35.74 and 10.33% respectively over mid and better parents as compared to 12.35 and 10.40% respectively in tetraploid hybrids over corresponding parents. On an average pentaploid crosses gave increased seed cotton yield of 136% against mid parents. Regarding ginning outturn percentage, the pentaploid hybrids produced maximum heterosis of 6.09 and 4.39% respectively, against mid and better parents while in tetraploid hybrids, corresponding values of 3.00 and 2.54% were recorded. Concerning staple length, hybrids from two ploidy levels did not show apparent differences.

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