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Theses

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Subject: Plant Breeding × Author: KAU × End date: 1987 × Type: Thesis × Thesis Type: M.Sc ×
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Now showing 1 - 9 of 22
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    ThesisItemOpen Access
    Heterosis for yield and resistance to bacterial wilt in brinjal
    (Department of Plant Breeding, College of Agriculture, Vellayani, 1987) Jameela Thomas; KAU; Gopinathan Nair, V
    Bacterial wilt of brinjal (Solanum malongena L.) caused by Pseudomonas colanacearum E.F Smith is a serious threat to brinjal cultivation all over India. Most of the commercial varieties are highly susceptible to this disease and hence unsuitable for cultivation in wilt endemic areas. Farmers in many places have been forced to abandon cultivation due to heavy incidence of bacterial wilt. Fine cross combinations were made between three resistant varieties (Pusa purple cluster, SM-6 and SMI-10) as ovule parents and each of three commercialbut susceptible varieties (Black beauty, Puma purple long and Puca purple round) as pollen parent , with a view to combine the wilt resistance of the former and high yield potential of the latter. The bacterial pathogen causing wilt in brinjal was isolated. Based on the cultural and physiological characters it was identified as Pseudomonas solanaecearum.
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    ThesisItemOpen Access
    Cross compatibility between Sesamum indicum L. and S. malabaricum
    (Department of Plant Breeding, College of Agriculture, Vellayani, 1987) Lali, K S; KAU; Gopinathan Nair, V
    Sesame is most valued annual oilseed crop of Kerala. Lack of varietieswith resistance to drought and diseases is the main problem confronting sesame cultivation in the state. The wild species Sesamum malabaricum shows tolerance to drought and most of the diseases. But this wild species appears to be non compatible with the cultivated S. indicum. An investigation was therefore undertaken to study cross compatibility between these two species. Eleven adapted varieties of S. indicum were crossed reciprocally with S. malabaricum. Capsule set was normal in direct as well as reciprocal crosses. In general it was more in reciprocal crosses . In general it was more in reciprocal crosses than in direct crosses. In spite of normal capsule set , these crosses failed to produce any normal seed. The seeds were either medium shrivelled or highly shrivelled. Failure normal seed development in a wide range of crosses confirm that these two species are noncompatible.
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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
    Breeding behaviour of interspecific hybrids in the genus Arachis L.
    (Regional Post Graduate Training Centre, Agricultural College and Research Institute, Coimbatore, 1962) Gopinathan Nair, P; KAU; Ponnaiya, B W X
    The investigation aims at a comparative study of two kinds of F2 populations. The first one was derived from hybrids between two tetraploid parents, namely A-hypognea and A.sp (A.354) whose genomes are homologous. The second typeof tetraploids were derived from back cross hybrids between A-hypognea and allotriploid (resulting from the cross A-hypognea X A.sp. (A.329)). A comparative morphological and cytological analysis of these F2 populations have been made. Special techniques such as Hybrid index method and Polygraphic analysis were adopted and the variability expressed in the two F2populations have been eveluated. The possible causes for the occurrence of a skewed recombination in the straight F2 population have been suggested.
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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
    Reproductive mechanism in cardamom
    (Department of Plant Breeding, College of Agriculture, Vellayani, 1982) Venkitaraman, S; KAU; Gopinathan Nair, V
    The study on the reproductive mechanism in cardamom was undertaken at the Cardamom Research Station, Pampadumpara in three popular cultivars viz., Malabar, Mysore and Vazhukka, Laboratory studies were conducted at the College of Agriculture, Vellayani. Different morphological characters of the panicle and flower, spread of flowering, time and mechanism of anthesis, pollen viability, stigma receptivity and self sterility were studied. The three cultivars were critically compared with respect to each of these characters
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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
    Progeny studies in west coast tall coconut palms of different yield groups
    (Department of Plant Breeding, College of Agriculture, Vellayani, 1982) Bindu, M; KAU; Gopakumar, K
    Observations made during 1981-82, while conducting a Systematic Pedigree Progeny Analysis at the Coconut Research Station, Balaramapuram, on the coconutpalm, variety West Coast Tall, belonging to the categories of Low, Medium and High yielders, yielded valuable information so as to ensure realization of the desired effect in inducing an overall enhancementin the late stage seedling progeny performance standards. Earlier recommendations stressed the need for exercising phase protracted selection at the levels of the motherpalm population, seednuts and the seedling progeny stand in the nursery, on specified norms. The findings of this study help to develop a more reliable methodology for identifying distinctly, the vigorous from the less vigorous among the seedling progeny.
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    ThesisItemOpen Access
    Investigations on the effects of X-rays on Cowpea (Vigna sinensis L. SAVI.)
    (Division of Agricultural Botany, Agricultural Botany, Agricultural College & Research Institute, Vellayani, 1964) Ravindran Nayar, P N; KAU; Kumara Pillai, P
    This thesis embodies the results of an investigation carried out to study the effect of X-rays on the common cowpea (vigna senensis). A pure variety of cowpea (African) was selected , dry and pre soaked seeds of which were treated with X-raysat the following doses: 1000, 3000, 5000, 7000, 9000, 11,000, 13,000 and 15,000 r. units. Germination, survival of plants, chlorophyll and other morphological abnormalities, growth of plants, pollen sterility, flower production, fruit set, average seeds per pod and 1000 seed weight were studied. The frequency of abnormal anaphases were studied from root tip squashes. Regression analysis was carried out for almost all obsevations to establish the relationship between doses and the different characters observed.