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Theses

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1962 - 196941970 - 19781
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Subject: Plant Breeding × End date: 1979 × Start date: 1961 × Type: Thesis × Thesis Type: M.Sc ×
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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
    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.
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    ThesisItemOpen Access
    Studies in some varieties and inter-racial hybrids of Oryza sativa Linn.
    (Faculty of Cytogenetics and Plant Breeding, Agricultural College and Research Institute, Coimbatore, 1964) Karunakaran, K; KAU; Ponnaiya, B W X
    The evolution in the concept of geographical rices in Oryza sativa L. The nature and extent of sterility in inter-varietal hybrids and the different explanations for the same, heterosis and its utilization of rice breeding, and pachytene analysis as amethod of karyotypic studies in the genus Oryza with special reference to the intervarietal karyotypic diversity in O.sativa have been briefly reviewed.
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    ThesisItemOpen Access
    Path Analysis In Rice ( Oryaa sativa Linn. )
    (Department of Agricultural Botany, College of Agriculture, Vellayani, 1978) Chalapathi, K; KAU; Gopakumar, K
    When biometrical studies on forty divergent varieties of lndlea rice (Oryza satlva L.) were conduoted at the College of Agriculture, Vellayanl under tbe Kerala Agricultural University during June - September 1977, the estimates for genotypic correlation of yield and eight components, aad path co-efficient of yield aad the first, second aad third orders of components revealed that relatively short 3tatured plants having more number of panicle bearing tillers, and more number of heavier grains on relatively shorter panicles, preferably with a few primary branches, have been found to be ideal for a type having high grain yield potential. Therefore, it Is recommended that selection for high grain ylelders in this crop should be based on these criteria.'
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    ThesisItemOpen Access
    Studies on the effect of F,W-450 and 2, 4-D as male gametocides in sesame (Sesamum indicum L.)
    (Division of Agricultural Botany, Agricultural College and Research Institute, Vellayani, 1969) Hariharan, N P; Abraham, A T
    The experiment was conducted to study the effects of F ,W-450 and 2, 4-D as male gamotocldos In sosamo, at throe stages of growth. The concentrations tried were 1S00 ppm., 2000 ppm., 2S00 ppm. and 3000 ppm. in case of F ,W-450 and SO ppm.,100 ppm., 150 ppm. and 200 ppm. in case of 2, 4-D.2, 4-D was highly toxic to the plants at all concentrations. F,W-450 at 3000 ppm. caused treatment shock expressed as marginal scorching of the loaves. Pollen sterility was tested by acotocarmine staining method, by germination of pollen grains in artificial medium and by crossing the control plants with pollen from treated plants. The first stage of application was more effective in inducing pollen ste rility and F,W-450 could induce 73$ ste rility without too much deleterious side effects. The plants treated with F,W-450 wore vigorous in growth. Maximum pollen ste rility was observed on the 9th day after treatment in a ll tho cases. Ovular sterility was judged by crossing the treated plants with pollen from control plants. Sterility was observed with the application of both tho chemicals but the intensity was directly proportional to the concentration of the chemicals.V iability of the seeds was also tested and it was found that the chemicals reduced the percentage of germination. V iability was too much reduced in seeds from plants treated with 2, 4-D. In short resplendent results wore obtained with F,W-450 and it was comparatively a better male gametocide for sesame. Results with 2, 4-D showed that this chemical w ill not bo a successful malo gamotocide in sesame. The never ending enthusiasm of man and tho highly developed nature of his grey matter are mastering the nature in multidirectional fashion. I am optimistic to believe that this experiment w ill add a speck of information to the heap of modern agriculture.