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ThesisItem Open Access Divergence studies in pumpkin (Cucurbita moschata Pair)(Department of Olericulture, College of Horticulture, Vellanikkara, 1989) Suresh Babu, V; KAU; Gopalakrishnan, T RThe present investigation on "Divergence studies in pumpkin (Cucurbita moschat a Poir ) was conducted at the College of Horticulture , Vellanikkara, Trissur during June 1988 - Marc h 1989. Seventy one pumpkin genotypes collected from different part of India and abroad were utilized for the study. The extent of variability and divergence among 50 selected genotypes were assessed and grouped into 5 clusters based on Mahalanobis D2 statistic . Cluster I, II, III, I V and V contained 2, 7, 9, 12 and 20 genotypes respectively y . Intercluster distance was maximum between clusters I and II and was minimum between clusters III and V . Cluster I showed maximum average intercluster distance with any other cluster. Screening 71 genotypes for resistance/ tolerance to pumpkin mosaic and yellow vein mosaic diseases revealed that all genotypes except C M 214 were susceptible. Artificial inoculation studies confirmed immunity of C M 214 (Nigerian Iocal ) to pumpkin mosaic virus and yellow vein mosaic virus .ThesisItem Open Access Homeostatic analysis of components of genetic variance and inheritance of fruit colour, fruit shape and bitterness in bitter gourd (Momordica charantia L.)(Department of Olericulture, College of Horticulture, Vellanikkara, 1989) Abdul Vahab, M; KAU; Gopalakrishnan, P KThesisItem Open Access In vitro studies on the propagation of cardamom (Elettaria cardamomum maton)(Department of Plantation Crops and Spices, College of Horticulture, Vellanikkara, 1989) Reghunath, B R; KAU; Gopalakrishnan, P KThesisItem Open Access Standardization of growing media for dendrobiums (Dendrobium spp.)(Department of Horticulture (Pomology & Floriculture and Landscaping), College of Horticulture, Vellanikkara, 1989) Anitha Paul, C; KAU; Rajeevan, P KThe study was conducted at the College of Horticulture, Vellanikkara, during 1988-89. The object of the study was to examine the effect of different growing media on the vegetative parameters of epiphytic orchids. Four species of Dendrobium, viz., D. farmeri, D. fimbriatum D. moschatum and D. mobile, selected based on their general performance at Vellanikkara conditions , were utilized for conducting the study. As the components of the media, five materials, viz., charcoal, brick, gravel, coconut fibre and husk, which were available locally, cheap and satisfying the growth requirements of epiphytic orchids were selected. All the possible combinations of these media, excluding their straight use , as well as the combination of all the five , were tried, thus consulting 25 treatments . The plant growth was observed based on five salient parameters recorded at monthly intervals, for seven months. There were ten plants in each treatment, from which five plants were randomly selected for taking the observations. The experiment was laid out in a completely randomised design. The result revealed that the media could significantly influence all the five vegetative characters, viz., number of new shoots, height, leaves, leaf area and number of pseudobulbs of the new shoots. In one species or other.ThesisItem Open Access Standardisation of epicotyl and softwood grafting in jack (Artocarpus heterophyllus Lam.)(Department of Horticulture (Pomology & Floriculture and Landscaping), College of Horticulture, Vellanikkara, 1989) Mini Jose; KAU; Valsalakumari, P KThe ivestigation on epicotyl and softwood grafting methods in jack was carried out in the Department of Pomology and Floriculture, College of Horticulture, Vellanikkara, Trichur during the period from June 1987 to April 1989, The objective of the study was to standardise the season, age of rootstock and to find out the effect of intermittent mist on the percentage of success of both epicotyl and softwood grafts, and to study the anatomical changes at the different stages of graft union and factors leading to failure of grafts. The studies revealed that the month of June was most suitable for both epicotyl (83.3 per cent sprouting and 5 per cent survival) under Kerala conditions, eventhough percentage of success was low for softwood grafting.ThesisItem Open Access Evaluation of ornamental chillies and selection for dwarf clustered plant types(Department of Olericulture, College of Horticulture, Vellanikkara, 1989) Mini, C; KAU; ; Peter, K VThe present investigations on "Evaluation of ornamental chillies and selection for dwarf clustered plant types' were conducted at the College of Horticulture, Vellanikkara, Trichur during May-October, 1988 and October -April 1988-89. The experiment consisted of three parts A) Evaluation, catalouging and documentation of ornamental chillies and selection of dwarf clustered plant types B) Use of Capsicum chinense Jacq. and Capsicum chacoense Hunz. to develop ornamental chillies and C) Evaluation of interspecific F1s.ThesisItem Open Access Influence of date of planting on seed yield and quality under two fertilizer levels in tomato (Lycopersicon esculentum Mill.)(Department of Olericulture,College of Horticulture, Vellanikkara, 1989) Rajan, N; KAU; Rajan, SAn experiment was conducted at the Department of Olericulture, College of Horticulture, Vellanikkara during the period from July, 1988 to February, 1989 to study the effect of date of planting on seed yield and quality under two fertility levels in tomato variety Sakthi (LE 79). The experiment was layout in a split plot design with three replications, as date of planting in the main plots and fertilizer levels in sub plots The date of planting had a significant impact on various growth and yield characters. The plant 'height and the number of secondary branches were maximum in October- planting. Inflorescence, clusters/ plant, flowers per cluster, fruits/cluster, pollen fertility and fruit set were also maximum in October planting followed by November planting. The February planted crops recorded, the lowest value, for these characters plots. The July' planting took longest time for crop duration while February planting registered the shortest duration. Fruits/plant, fruit yield/plant, average fruit weight and seed, yield/plant were higher in October planting followed by November planting. The lowest value for these characters was in February crop. The high level of fertilization (NPK 150:60:60 kg/ha) brought a significant improvement on these characters.ThesisItem Open Access Hybridisation in banana - Cytomorphological evaluation of hybrids and embryo culture studies(Department of. Horticulture (Pomology, Floriculture and Landscaping) , College of Horticulture, Vellanikkara, 1989) Lekshmy, M L; KAU; Valsalakumari, P KInvestigations on the evaluation of three banana hybrids evolved in Kerala Agricultural University t vis. Agniswar x Pisanglilin, Mannan x Pisanglilin and Vannan x Pisanglilin and standardisation of embryo culture technique for hybrid, seed* of banana were carried out,in the Department of Pomology and Floriculture, College of Horticulture during the year 1987-88 The hybrids were evaluated for their morphological characters duration aspects, bunch characters, finger characters and quality aspects. Male and female fertility status of the hybrids were also studied. The three hybrids differed significantly for the characters studied. Among the hybrids, Agnisvar s Pisanglilin was the dwarfeat (228*33 can) and had maximum number of functional leaves (it flowering. The hybrid Hannan x Pisanglilin recorded highest values for total duration (210.33) duration of male phase (111.67 days) finger weight (114.55 g) acidity (0.67) reducing sugers (15.38 per cent) end total sugers (16.79 per cent). The hybrid Vannan x Pisanglilin recorded the highest values for duratlon of female phase (7 days) bunch weight (12.70 kg) number of fingers (127.67) and pulp peal ratio (4,6)ThesisItem Open Access Heterosis and genetic analysis involving isogenic lines in brinjal resistant to bacterial wilt(Department of Olericulture,College of Horticulture, Vellanikkara, 1989) Geetha, P T; KAU; Peter, K VThe present studies "Heterosis and genetic analysis involving isogenic lines in brinjal resistant1 to bacterial wilt" were initiated during May 1988 and evaluation trial conducted during October 1988 to March 1989 in the vegetable research plots of Kerala Agricultural University, Vellanikkara. Evaluation of nine parental lines and six F1 hybrids revealed considerable variation for many of the economic characters. Phenotypic coefficient of variation was maximum for fruits/ plant. High heritability along with high estimate of genetic advance was also observed for fruits plant. The F^ hybrids SM 6 - 6 x SM-132 and SM 6-2 x Pusa Purple Cluster were promising and were resistant to bacterial wilt. Genetic distance was maximum between SM 6 - 6 and. Arka Kusumkar. Significantly positive correlation was observed between yield and plant height, primary branches/plant, percentage of productive flowers and total fruits/plant. The yield had a negative association with days to first fruit set, average fruit weight and average, fruit volume. i Path analysis revealed that primary branches/plant had the maximum direct effect on yield. Plant height had the maximum indirect effect through primary branches.
