Nutrients profiling for investigating variation and its effect on heterosis and combining ability of cucumber (Cucumis sativus) (original) (raw)
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New Zealand Journal of Crop and Horticultural Science, 2017
The present investigation was undertaken in F 1 population of 48 crosses, developed by crossing 16 lines (8 gynoecious) and 3 testers during the year 2011. All the parental lines and their F 1 hybrids were evaluated in randomised complete block design for yield and its contributing traits during the year 2012. Experimental results revealed that parental lines LC-1-1, CGN-20953, CGN-19533, Gyne-5, LC-15-5 and testers Japanese Long Green and K-75 were found superior on the basis of mean performance and general combining ability effects. The cross combinations LC-1-1 × K-75 (monoecious), CGN-19533 × K-75 (gynoecious), CGN-20953 × Poinsette (gynoecious), Gyne-5 × K-75 (gynoecious) and LC-3-3 × Poinsette (monoecious) excelled based on per se performance, specific combining ability and heterosis studies. Further, performance of top 10 heterotic hybrids illustrated the presence over dominance effects in all the crosses except in one cross, where no dominance was observed. Gene action studies indicated that non-additive gene action governed all the traits under study, suggesting the importance of heterosis breeding for the development of high yielding stable parthenocarpic gynoecious hybrids in cucumber.
Combining Ability and Gene Action in Cucumber (Cucumis Sativus L.)
Journal of Agricultural Studies, 2018
Combining ability and genetic components of eleven inbred line of cucumber were estimated following line x tester mating design for qualitative and quantitative characters. Three inbred lines were used as tester. Variance within the treatments, parents, parent vs crosses, crosses, testers and line x tester interaction were highly significant for all the characters. Considering the gca effects the lines CS08, CS16, CS040, CS07 and CS51 were best for their earliness and other horticulture traits. The hybrids CS07×CS08, CS16×CS44, CS51×CS44, CS40×CS08, CS17×CS39 were superior in terms of yield per plant and its component characters. The magnitude of σ2SCA was high in all characters compared to σ2GCA and dominance variance (σ2D) was higher than the additive genetic variance (σ2A) indicating that the predominance role of non-additive gene action. The results indicated the importance of heterosis breeding for effective utilization of non-additive genetic variance in cucumber.
Genetic Studies for Different Seed Traits in Cucumber (Cucumis sativus L)
International Journal of Current Microbiology and Applied Sciences, 2017
The present investigation was carried out to study the mean performance, heterosis, combining ability and gene action for different seed traits viz., seed germination, seed vigour index-I, seed vigour index-II and fruit yield in 15 F 1 crosses, developed by crossing 6 genotypes during the year 2015. The seeds of all parents and their crosses, along with standard check (KH-1) were assessed for different seed traits (under laboratory conditions) and fruit yield (under open field conditions) during the year 2016. Experimental results revealed that genotypes PI-618860, Khira-75, UHF-CUC-1 and UHF-CUC-2 were found superior on the basis of mean performance, heterosis and general combining ability studies. The cross combinations viz., Khira-75 x PI-618860, Khira-75 x UHF-CUC-1, Khira-75 x UHF-CUC-2 and Khira-75 x PI-618860, UHF-CUC-1 x PI-618860, UHF-CUC-3 x Poinsette, UHF-CUC-3 x PI-618860 were found best on the basis of mean performance, heterosis and specific combining ability studies respectively. Further, Gene action studies indicated the predominant role of non-additive gene action for the control of all the traits under study; hence heterosis breeding can be utilized for the genetic improvement of seed vigour and yield traits in cucumber.
In this research, 44 genotypes with two checks Pant Khira-1 and Pointsette of cucumber (Cucumis sativus L.) were studied that were collected from different geographical regions. The experiment was conducted as a randomized block design (RBD) with three replications in open field condition. Average distance of inter and intra centroids cluster analysis was done to study the divergence in genotypes including checks in respect of various economic traits. The genotypes were grouped into seven non overlapping clusters. The averages inter and intra cluster distances have been presented. The distribution patterns of genotypes of cucumber into seven clusters have been analyzed. Data was collected on morphological features, yield and components of yield of cucumber which include: days to first male flowers, node number to first male flower, days to first female flowers, node number to first female flower, internodal length, days to first fruit harvest, number of fruits per plant, fruit length, fruit diameter, fruit weight, test weight, seed index, primary branches per plant, plant height and yield. The genotypic coefficients were higher in the magnitudes relative to corresponding estimates of phenotypic coefficients, which indicated high heritability of the traits under study. Number of fruits per plant (0.860**) showed positive significant correlation with yield in highly significant positive correlation, the values of direct and indirect contribution of different traits toward yield revealed the maximum direct effect of number of fruits per plant (0.837) and maximum positive indirect effect of number of fruits per plant (0.110). Therefore, Selection of superior genotypes in view point of desirable morphologic traits, with high genetic distance could be selected for hybridization programs and recognition of best genotypes for different traits to produce new elite hybrids in cucumber.
Twenty one F1 hybrids were developed from crossing of 7 diverse genotypes including two gynoecious lines of cucumber in a half diallel mating system. These twenty one F1 hybrids along with their seven parents were evaluated to study the gene action in gynoecious and monoecious lines for various earliness and yield components in cucumber. Analysis of variance revealed the presence of highly significant differences among the genotypes representing that these were diverse for the traits studied. The prevalence of over dominance effect for node number of first female flower, days to first female flower anthesis, days to fruit set from opening of first female flower, days to first fruit harvest, number of fruits per plant and total yield per plant, whereas nearly dominance effect was observed for number of fruits per plant and partial dominance effect was observed for fruit length, fruit diameter and average fruit weight. For average fruit weight, narrow sense heritability was greater than 50% which is an indication of predominance of additive gene action, while for remaining traits narrow sense of heritability was less than 50%, which suggests the preponderance of non-additive gene action. Therefore, in the present study, the predominance of non-additive gene action and low narrow sense heritability was recorded for most of the important earliness and yield contributing characters suggested the significance of heterosis breeding to obtain higher gain in cucumber improvement.
genetic variability and correlation studies in cucumber
A field experiment was conducted with 20 diverse genotypes (BSC-1, BSC-2, CH-122, 126,128, CHC-1, Swarna Ageta, VRC-11-2, CC-3, CC-8, DR/NKV/02,VRC-19, CC-2, 4, 5, 6, 7 , 9, 1 and Ranchi-1) in randomized block design with three replications. Analyzed data revealed that among all the genotypes CC-5, BSC-2, BSC-1, CH-128, CHC-2 and CC-2 gave promising results.
General and Specific Combining Ability and Heterosis for Yield in Cucumber Fresh Market Lines
International Journal of Vegetable Science, 2016
Cucumber (Cucumis sativus L.) yield quantity and quality can be improved. Estimates of combining ability are useful in determining breeding value of cucumber lines by suggesting the appropriate use in breeding to generate new hybrids with high yield and quality. The research was conducted to estimate general and specific combining ability and heterosis in 7 inbred lines proposed for cucumber breeding according previous research. The highest early yield specific combining ability (SCA) and general combining ability (GCA) were related to lines B10 and B12 and crosses B12×A0 and B10×A4. Line A11 and B12 had the highest positive, and negative, cull yield GCA and the crosses A0×B10 and A0×B12 had the highest negative cull yield SCA. Lines B10, A4 and B12 and crosses B12×A0, B10×A11 and B10×A4 had the highest positive marketable yield GCA and SCA. Lines B10 and A4 and A c c e p t e d M a n u s c r i p t 2 crosses B12×A0, B10×A11 and B10×A4 had the highest positive total yield GCA and SCA. Lines B10, B12 and A11 and the B10×A4 cross had the highest positive SWI GCA and SCA. Lines B10 and A4 are proposed for high yield hybrid production and their hybrid next generation are suitable for selecting and releasing new high yielding lines.
In this research, fortyfour genotypes with two check varieties of cucumber (Cucumis sativus L.) were studied that were collected from different geographical regions of India. Biodiversity is one of the most important factors in the survival and improvement of any species. Therefore, germplasm collection is the first step for plant improvement. To investigate their genetic and morphological relationships morphological traits of genotypes of cucumbers were evaluated with check varieties. We found that the traits, the total yield varied during first season from 48.80-144.48 (q/ha) with average of 89.81(q/ha). During second season, it varied from 46.30-202.00 (q/ha) with an average of 104.90 (q/ha). The single fruit weight varied during first season from 182.98 to 371.87 gm. with average of 287.89 gm. During second season, it varied from 180.16 to 380.11 gm. with an average of 281.75gm. Fruit length varied during first season from 6.43 to 25.28 cm. with average of 16.22 cm. During second season, it varied from 6.06 to 25.26 cm. with an average of 16.25 cm. The number of fruits per plant varied during first season from 3.30-8.30 with average of 5.60. During second season, it varied from 2.80-10.56 with an average of 6.69. The distinct genotypes found in this study based on morpho-molecular characters will great interest to cucumber breeder for selection of diverse parent or production of mapping population.