Heterosis, combining ability and potence ratio for yield and quality attributes of parthenocarpic cucumber (Cucumis sativus L.) grown in poly-net house
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Date
2022
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Punjab Agricultural University, Ludhiana
Abstract
The present experiment was conducted to estimate the heterosis, combining ability and potence ratio for yield and quality attributes of parthenocarpic cucumber hybrids grown under poly-net house conditions. The four parthenocarpic lines and seven testers were crossed in line x tester mating design to develop 28 cross combinations. The 41 genotypes including 11 parents, 28 cross-combinations and two standard checks were evaluated for eleven yield and quality traits in a Randomized Block Design (RBD) with three replications during February 2022 to May 2022. The analysis of variance indicated significant genetic variability among all the genotypes for all the traits. The analysis of combining ability revealed highly significant variance due to GCA and SCA effects for almost all the traits indicating the role of both additive and non-additive gene action, respectively in inheritance of these traits. The experimental results revealed that the line „PBRK-16‟ exhibited high and significantly positive GCA effects and mean performance for fruit yield per plant, fruit weight, fruit length, fruit diameter and water content whereas „PBRK-15‟ was observed to be good general combiner for earliness which includes node at which first female flower appears and days to first fruit picking. The line „Punjab Kheera-1‟ exhibited high and significant GCA effects for number of fruits per plants. Among testers, „PBRK-8‟ showed high and significant GCA effects and mean performance for fruit yield per plant and number of fruits per plant whereas PBRK-10 exhibited highly significant GCA seffects and mean performance for fruit length and fruit weight. Besides, the „PBRK-1‟ exhibited high and significant GCA effects for earliness. The cross combinations „PBRK-16 x PBRK-18‟, „PBRK-16 x PBRK-8‟ and „PBRK-16 x PBRK-1‟ exhibited high and significantly positive SCA effects, mean performance and economic heterosis for fruit yield per plant and number of fruits per plant, respectively whereas cross combination „Punjab Kheera-1 x PBRK-1‟ and „PBRK-9 x PBRK-17‟ showed high and significantly negative SCA effects, mean performance and economic heterosis for node at which first female flower appears and days to first fruit picking. However, cross combination „PBRK-9 x PBRK-10‟ showed high and significantly positive SCA effects, mean performance and economic heterosis for fruit length and fruit weight. From potence ratio, it was observed that partial to over-dominance effect was observed for all the traits under study. However, the cross combinations „PBRK-16 x PBRK-8‟ and „Punjab Kheera-1 x PBRK-18‟ showed over-dominance (>±1) effect for fruit yield per plant, number of fruits per plant and fruit length. Besides, the over-dominance effect was showed high amount of heterosis which can be achieved by development of high yielding parthenocarpic cucumber hybrids. Therefore, it is concluded that hybrids „PBRK-16 x PBRK-18‟ and „PBRK-16 x PBRK-1‟ are observed to be best for most of yield and its attributing traits having desirable fruit length and fruit diameter. Hence, these parthenocarpic cucumber hybrids can be released as commercial for cultivation in poly-net house.
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Prakash (2022) Heterosis, combining ability and potence ratio for yield and quality attributes of parthenocarpic cucumber (Cucumis sativus L.) grown in poly-net house (Unpublished M.Sc. thesis). Punjab Agricultural University, Ludhiana, Punjab, India.