1. KAUTIR (Kerala Agricultural University Theses Information and Retrieval)
Permanent URI for this communityhttp://localhost:4000/handle/123456789/1
Browse
6 results
Search Results
Item Intervarietal heterosis in Capsicum annuum L. and evaluation of a set of clustered bell peppers(Department of Olericulture, College of Horticulture, Vellanikkara, 1987) Girijadevi, T; Peter, K VThe present studies ‘Intervarietal heterosis in Capsicum annuum L. and evaluation of a set of clustered bell peppers’ were conducted at the College of Horticulture, Kerala Agricultural University, Vellanikkara during July 1985 - December 1986. The materials for the study comprised of five bell pepper varieties, two hot chillies and their 10F1 hybrids. Evaluation of these materials revealed considerable variation for most of the economic characters. Phenotypic coefficient of variation was maximum for fruits/plant. High heritability coupled with high genetic advance was also observed for frults/plant. The F1 hybrids Involving bell peppers and hot chillies were found suitable for warm humid tropical conditions of Kerala. All the F1 hybrids yielded more than the better parent. The F1hybrids showed desirable heterosis for plant height, primary branches/plant, tap root length, primary roots/plant, days to flower, days to green fruit harvest, days to fruit ripening, fruit length, fruit perimeter and green fruit yield/plant. The F1 hybrid Hungarian Wax x KAU Cluster was the most promising yielding 482.8 g/plant (fruits/plant - 92) followed by Sweet Red Cherry Pickling x KAU Cluster and Hungarian Wax x Pant C-l. Combining ability analysis revealed the preponderance of additive gene action for primary branches/plant, days to flower, fruits/plant and green fruit yield/plant. A preponderance of non-additive gene action was observed for plant height, tap root length, primary roots/plant and days to green fruit harvest, days to fruit ripening and fruit perimeter. Preponderance of additive and non-additive gene action was observed for fruit length. The parental lines were grouped into three and four clusters during first and second seasons respectively, based on Mahalanobis D2 statistics. The line KaU Cluster was found resistant to bacterial wilt. Primary roots/plant was positively correlated with yield. In segregating generations of Hungarian Wax x KaU Cluster and Sweet Red Cherry Pickling x KAU Cluster considerable variation was observed for all the characters studied. Elite clustered bell pepper lines were Identified and progressed.Item Selection index in horse gram (Dolichos biflorus L.)(Department of Agricultural Botany, College of Agriculture, Vellayani, 1980) Suraiya, D; Mercy, S TThe present biometric study was carried out in the College of Agriculture, Vellayani during the year 1979-80 with fifteen varieties of horse gram (Doliches biflorus L.) to formulate a suitable selection index for yield. The observation plants were studied individually for the following characters. (1) Seed yield per plant (2) Number of pods per plant (3) Number of seeds per pod (4) 100-seed weight (5) Pod length (6) Days to 500 flowering (7) Height of plant (8) Number of branches (9) Days to maturity (duration). The data obtained in the study were subjected to statistical analysis viz. estimates of mean for all the different varieties, analysis of variance in respect of the nine selected characters, estimates of components of variances, genotype, environmental and phenotypic coefficients of variations, heritability, genetic advance and studies of discriminant function and path coefficient analysis.Item Genetic variability, path analysis and stability parameters in sesame(Department of Plant Breeding, College of Agriculture, Vellayani, 1985) Sverup John; Gopinathan Nair, VBiometric analysis in a varietal collection of sesame was undertaken to study the genetic variability, correlations, path analysis and stability parameters. One hundred sesame types were evaluated in replicated trials at Vellayani in uplands during rabi and at Kayamkulam in rice fallows during summer. Genetic variability and correlations were estimated and path analysis worked out independently as both the locations. Location trials for estimating stability parameters were conducted at three places viz. in uplands during rabi at Pattambi and Vellayani and in rice fallows during summer at Kayamkulam. Large values for genotypic coefficients of variation were obtained for characters such as number of capsules on branches, number of capsules perplant, number of capsules on main stem and number of branches during rabi as well as summer. The lowest genotypic coefficient of variation was obtained for number of days to maturity during both rabi and summer. High values of heritability were recorded by seed protein content , seed oil content, height upto first capsule and weight of 1000 seeds under both conditions.Item Genetic variability, path analysis and stability parameters in sugarcane(Department of Plant Breeding, College of Agriculture, Vellayani, 1986) Sreekumar, S G; Gopinathan Nair, VInvestigations on genetic variability, path analysis and stability parameters wore conducted at the Sugarcane Research Station, Thiruvalla, Sugarcane Research Centre, Chittoor and Horticultural Research Station, Ambalavayal. The analysis of data collected from 48 clones evaluated at Thiruvalla revealed that the clones showed significant differences for all the 21 characters except Juiciness at 10th month in the first ratoon crop. The germination count on the 45th day, shoot count on the 180th day, number of late shoots at harvest, number of millable canes per plot, cane yield per plot and sugar yield per plot recorded moderate to high heritabiiity in the broad sense coupled with high genetic advance both in the plant and in the first ratoon crops indicating that selection based on these characters will be effective in improving cane and sugar yields. Correlation studies revealed that cane yield per plot had significant positive genotypic correlations with germination count on the 43th day, shoot count on the 180th day, number of millable canes per plot, cane weight and length of cane both in the plant and the first ratoon crops. Therefore, improvement in any one or more of these characters will result In a simultaneous improvement in the yiold of cane. Tho quality characters such as Juiciness, brix, pol and C.C.S. percentages at 12th month had positive but non-significant correlations with cane yield In ths plant crop and the first ratoon crop, suggesting difficulty in the simultaneous improvement of cane yield and quality characters through direct selection. The number of late shoots at harvest had highly significant positive genotypic and phenotypic correlations with the yield of cane in the first ratoon crop indicating that the number of late shoots at the time of harvest can be considered as a reliable criterion for the selection of clones with good yielding ability in the ratoon crop. Sugar yield recorded significant positive gonotypic correlations with cane yield and tho components of cane yield such as germination count on the 45th day, number of millable canes per plot, cane weight and length of cane. Sugar yiola also had significant positive genotypic correlations with brix, pol and C.C.S,percentages at 12th month, Tho significant positive gonotypic correlations of sugar yield with cane yield and its important components suggests that by increasing the cane yield, sugar yield per plot can be increased.Item Comparision of path coefficient analysis and principal component analysis and principal component analysis in turmeric(Department of Statistics, College of Veterinary and Animal Sciences, Mannuthy, 1985) Geetha, U; Prabhakaran, P VThe discriminant function technique was adopted for the construction of suitable selection indices for rhizome yield in turmeric, utilising the characters selected through principal component analysis and path coefficient analysis and relative discriminating powers of these two multivariate techniques in identifying the pertinent characters aws also evaluated. Data on 18 biometric characters of 19 varieties of turmeric gathered from a field trial conducted by the Department of Plantation Crops, College of Horticulture, Vellanikkara, Trichur during the year 1977- 1978 were utilised for the studyItem Genetic divergence in cluster bean (Cyamopsis tetragonoloba (L.) Taub.)(Department of Plant Breeding and Genetics, College of Agriculture, Vellayani, 2006) Anandhi, K; Sunny K OommenThe present study aimed at evaluating a collection of clusterbean (Cyamopsis tetragonoloba (L.) Taub.) genotypes for yield and related characters and grouping of genotypes was carried out at the Department of Plant Breeding and Genetics, College of Agriculture, Vellayani during the period 2003-2004. Twenty nine genotypes of clusterbean were evaluated for yield and yield related characters in randomized block design with three replications. The analysis of variance revealed significant differences among the varieties for all the characters studied which include days to 50 per cent flowering, plant height, number of primary branches, number of pod clusters per plant, number of pods per cluster, pod weight, pod length, number of seeds per pod, number of pods per plant and yield per plant. High values of PCV with correspondingly high values of GCV were observed in the present study for number of pod clusters per plant, number of pods per plant, number of pods per cluster and yield, which indicated the existence of high degree of genetic variation and ample scope for improvement of these characters through selection. High values of heritability coupled with high genetic advance was observed for number of pod clusters per plant, pods per plant, pod yield and number of pods per cluster suggesting additive gene action for these traits. There is immense scope for improvement of number of pod clusters per plant and number of pods per plant through selection on account of their high magnitude of heritability and exceptionally high genetic advance. Vegetable pod yield showed high positive genotypic correlation with the characters number of pods per plant, number of seeds per pod, pod weight and number of pod clusters per plant. Path coefficient analysis revealed number of pods per plant and pod weight are the characters with high direct effect. These two characters had got high indirect effect on yield through number of pod clusters per plant and number of seeds per plant respectively. Hence these characters can be identified as the major characters contributing towards pod yield and selection based on these characters would be effective for developing high yielding varieties of clusterbean genotypes. Based on Mahalanobis statistic, the 29 genotypes of clusterbean were grouped into four clusters. Cluster II was the largest with 10 genotypes. Intercluster distance was observed maximum between clusters I and IV while the close proximity was noticed between the clusters II and III. Cluster IV having the single variety Ct 11 exhibited the maximum mean value for yield per plant, number of pods per plant and number of clusters per plant indicating that this cluster is superior to the others with respect to these characters. Cluster II having Ct 7 was superior for pods per cluster, pod weight and days to 50 per cent flowering. On the basis of selection index the genotypes IC 10350 (Ct 11) and IC 8423 (Ct 7) recorded highest index value. Hybridization of the superior genotype Ct 11 of cluster IV with Ct 7 of cluster II having high pod weight would be beneficial for evolving high yielding genotypes.