Ridge or ribbed gourd (Luffa acutangula Roxb., 2n = 2x = 26) is a popular cucurbitaceous vegetable grown as spring and summer season crop. The fruits have 10 prominent longitudinal ridges; thus the plant is also described as "angular loofah", "Chinese okra," ridged gourd," or "fluted loofah." Ridge gourd is one of the least expensive vegetables to produce. It is cultivated on commercial scale and in kitchen garden.Combining ability analysis has greater importance in crop improvement to identification of best combiners and utilize them in hybridization programme to produce superior hybrids, either to exploit for heterosis or to combine favourable genes (Meena et al., 2015). This technique was developed by Kempthorne in 1957. In addition, the information on nature of gene action will be helpful to develop efficient crop improvement programme. General combining ability is due to additive and additive × additive gene action and is fixable in nature while specific combining ability is due to non-additive gene action which may be due to dominance or epistasis or both and is non-fixable. The presence of non-additive genetic variance is
Bottle gourd [Lagenaria siceraria (Mol.) Standl.] is one of the important cucurbitaceous vegetable having wide range of uses and it is cultivated largely in the tropics and subtropics for its edible fruits. It is commonly called as calabash gourd, trumpet gourd, white flowered gourd and zucca melon. Bottle gourd is a commonly grown vegetable in India having chromosome number of 2n = 22. Heterosis signifies increased or decreased vigour of the F 1 hybrids over the parents. Some bottle gourd hybrids Pusa Meghdoot and Pusa Manjari were released, long back in 1971, by Indian Agricultural Research Institute, New Delhi. The commercial exploitation of hybrid vigour depends on the ease with which the technique employed for hybrid seed production and reasonably the low cost of F 1 seed production.
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