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Theses

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1984 - 19868
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Subject: Plant Breeding × End date: 1986 × Start date: 1984 × Thesis Type: M.Sc ×
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Now showing 1 - 8 of 8
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    ThesisItemOpen Access
    Evaluation of bhindi hybrids for yield and its components
    (Department of Plant Breeding, College of Agriculture, Vellayani, 1986) Sheela, M N; Manikantan, Nair, P
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    ThesisItemOpen Access
    Genetic studies on induced viable mutants in rice [Oryza sativa L.)
    (Department of Plant Breeding, College of Agriculture, Vellayani, 1985) Vijayagopal, P D; Gopinathan, Nair V
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    ThesisItemOpen Access
    Evaluation of the productivity of chilli hybrids
    (Department of Plant Breeding, College of Agriculture, Vellayani, 1986) Elizabeth Philipose; KAU; Manikantan Nair, P
    A study was conducted at College of Agriculture, Vellayani, for evaluating the productivity of six intervarietal chilli (Capsicum annuum L.) hybrids obtained by crossing four inbreds in all possible combinations without reciprocals. Since the germination of the combination PR x PCl was poor, the other five hybrids along with four parents were evaluated in a 9 x 3 RED during 1984-85 and 1985-86. Observations on twenty quantitative and five five qualitative attributes were recorded. The statistical analysis included analysis of variance , pooled analysis and the estimation of genetic parameters, correlations among sixteen quantitative traits and three types of heterosis namely relative heterosis, heterobeltiosis and standard heterosis
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    ThesisItemOpen Access
    Pollination, pod set and compatibility studies in open pollinated progenies of cocoa var. Forastero
    (Department of Plant Breeding, College of Horticulture, Vellanikkara, 1984) Madhu, P; KAU; Kumaran, K
    Investigations were carried out at the College of Horticulture Vellanikkara, Thrissur, to study the polination , pod set and compatibility aspects of open pollinated progenies of cocoa, var. Forastero. It was found that eventhough cocoa flowered thoughout the year, maximum flower production was between November and April. The flower opening was a slow process starting from 2 to 4 pm and lasting upto 2 to 4 pm on the subsequent day . Maximum stigma receptivity was found between 10 am and 12 Noon. Natural pollination was through the agency of insects. By controlled pollination there was 48 per cent increase in the pod set. Hand pollination by forceps was found to be the best method of artificial pollination. A large number of pod set was not carried to maturity due to the incidence of cherelle wilt. The loss due to Cherelle wilt ranged from 37.04 percent to 70.37 per cent. Most of the trees studied were self-incompatible , while two of them were self compatible. The self - incompatibility in the materials investigated herein could be exploited for production of hybrid pods.
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    ThesisItemOpen Access
    Cross compatibility between abelmoschus esculentus and abelmoschus manihot and hybrid sterility
    (Department of Plant Breeding, College of Agriculture, Vellayani, 1986) Prabha, P; KAU; Gopakumar, K
    Observations made during 1985, while conducting a breeding experiment on interspecific hybridization in the genus Abelmoschus of family MALVACEAE, reveal that the virus caused Yellow Vein Mosaic disease susceptible bhindi varieties of the cultivated species esculentus cross readily with the resistant wild/ semi-wild species manihot. Absence of interspecific mating incompatibility is of advantage in programmes of breeding for evolving improved varieties of the crop with built-in-resistance. The first generation hybrids though do not produce viable seeds in profusion, are not totally sterile. The scanty viable seed recovery from the hybrids against the parents is suspected to be due to chromosomal differentation that could have taken place during speciation in the genus
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    ThesisItemOpen Access
    Evaluation of the F2 generation of interspecific hybrids of Abelmoschus with reference to yellow vein mosaic resistance and yield
    (Department of Plant Breeding and Genetics, College of Agriculture, Vellayani, 1986) Honey Mathews; KAU; Gopimony, R
    A study was conducted at the College of Agriculture, Vellayani during 1984-85 aimed at evaluating the F2 generation of interspecific hybrids between the yellow vein mosaic susceptible cultivars of Abelmoschus esculantus and the resistant semi-wild species. A manihot for yellow vein mosaic resistance and yield and selecting desirable F2 recombinants
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    ThesisItemOpen Access
    Genotype X environment interaction, for yield and its component a in sesamum
    (Department of Plant Breeding and Genetics, College of Agriculture, Vellayani, 1984) Geetha, P; KAU; Gopinathan Nair, V
    A detailed evaluation of the production potential of 15 multipoded and multiloculed types and varieties available at the Department of Plant Breeding, College of Agriculture, Vellayani, was undertaken to select suitable varieties for the summer rice fallows and robi uplando. The study also aimed at the estimation of genotype x environment interaction, the phenotypic stability of these varieties and the correlations of different characters including seed yield. The field trials were laid out at two locations vis, summer rice « > fallows at Kayamkulam and rabi uplands at Vellayani. The analysis of variance in respect of each character for each location, as well as for both the locations together was done. There was no significant difference between the varieties for number of days to flowering, at both the locations. But they differed significantly for days to maturity, length of pod, number of locules per pod, number of seals per pod, seed yield per plant, weight of thousand seeds and oil content. There was significant difference for height of plants end number of pods per plant in rice fallows and for number of pods per axil in uplands.
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    ThesisItemOpen Access
    Estimation of heterosis in bhindi [Abelmoschus esculentus (L.) Moench]
    (Department of Plant Breeding, College of Agriculture, Vellayani, 1984) Balachandran, P V; KAU; Manikantan Nair, P
    A study was conducted at the College of Agriculture, Vellayani during Kharif 1983 with fifteen intervarietal, hybrids of bhindi and their parents, aimed at estimating the heterosis manifested by the hybrids and selecting superior ones displaying economic attributes. Study of variability in the population, heritability , and genetic advance with respect to important economic characters along with fruit quality attributes, and association among the characters also formed part of the objectives. The hybrids were obtained in a diallel cross without reciprocals among the single generation inbreds o f six genetically diverse cultivars, originally selected from a germplasm of 57 accessions. The six parents and fifteen hybrids ware evaluated during 1983 in an RBD with three replications . The characters studied included thirteen quantitative traits and four fruit quality attributes