Assessment of heterosis and combining ability of advance lines in okra [Abelmoschus esculentus (L.) Moench]

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Date
2010
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CCSHAU
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The present field investigation entitled “Assessment of heterosis and combining ability for advance lines in okra [Abelmoshcus esculentus (L.) Moench] was undertaken at Vegetable Research Farm, Department of Vegetable Science, CCS Haryana Agricultural University, Hisar during rainy season 2009-2010. Fifteen females, three males and their forty five hybrids along with standard check Varsha Uphar were evaluated in a randomized block design with three replications. Data were recorded for fruit yield and its associative traits. The analysis of variance revealed that significant differences were observed for all the characters studied, thereby indicating considerable variability among the genotypes. The extent of heterosis varied from cross- to- cross for all the characters studied. Marked heterosis was observed for fruit yield and its associative traits. However, two cross combinations namely HRB-146-2-1 x Hisar Unnat and HRB-146-1-1-1 x Hisar Navin manifested maximum desirable heterosis for days to 50 per cent flowering, days to first picking, number of fruits per plant and fruit yield, that may be utilized to exploit hybrid vigour for commercial hybridization programme. Combining ability study indicated that the both additive and non additive gene actions governed the inheritance of all the characters studied. General combining ability effects advocated that female parents viz. HRB-141-1, HB-03-25-2, Raj-12 and HRB-146-2-1 were observed good general combiners for fruit yield and its associative traits. None of the male parents identified as good general combiner. Per se performance and gca effects of parents exhibited very close relationship. The estimates of specific combining ability effects suggested that two crosses, HRB-150-1-1 x Hisar Unnat and HB-06-1 x JNDOL-03 showed high sca effects for fruit yield and its component traits. Hence, recurrent selection by intermating of most desirable segregants can be adopted for the improvement programme in order to utilize additive and non additive genetic variances controlling inheritance of different characters studied. Genotypic correlation study revealed that the fruit yield showed highly significant and positive association with number of fruits per plant and fruit weight. Besides, fruit diameter, fruit length and plant height had positive correlation with fruit yield. Path analysis indicated that positive direct effect on fruit yield through number of fruits per plant followed by fruit weight and fruit length. Therefore, simple selection method will be effective for crop improvement programme as the expression of these characters is controlled by additive gene action.
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