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Theses

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1975 - 19795
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Subject: Agriculture × Author: KAU × End date: 1979 × Start date: 1975 ×
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Now showing 1 - 5 of 5
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    ThesisItemOpen Access
    Studies on intervarietal hybrids of tomato
    (Division of Agricultural Botany, College of Agriculture, Vellayani, 1975) Rema Bai, N; KAU; Mary K, George
    The present investigations were carried out in College of Agriculture, Vellayani during the year 1974-75. Five varieties of Lycopersion esculentum viz., YRFN-3, Mech9, VF36, Walter and Local were utilised for intercrossing. Investigations on the quantitative and qualitative characters, heterosis, hybrid sterility and sucrose content of the parents and hybrids were undertaken. Though the hybridisation work was done in all combinations, there was fruit setting only in fourteen crosses. YRFN-3 as male parent failed to cross with any other varieties except with Walter. In this case though fruit setting was occurred, seeds obtained were not viable. YRFN-3 as female parent also failed to cross with any other varieties except with Local.
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    ThesisItemOpen Access
    Genetic studies in cowpea
    (Division of Agricultural Botany,College of Horticulture, Vellanikkara, 1979) Chandrika, P; KAU; Narayanan Namboodiri, K M
    Geneticstudies were undertaken with 202 varieties of cowpea (Vigna ungulculata L.) maintained in the germplasm collection of the Division of Agricultural Botany, College of Horticulture, Vellanikkara. The studies conducted during the two khariff seasons of 1977-78 and 1978-79 were mainly directed towards estimation of the variability available in the collection, working out of the heritable components of the variability, identification of promising donor varieties for important characters and grouping the varieties into clusters according to the estimated genetic distances following the Mahalanobis D2-statistic.
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    ThesisItemOpen Access
    Studies on the F3 generation of intervarietal crosses in rice
    (Division of Agricultural Botany, College of Agriculture, Vellayani, 1976) Thomas Mathew; KAU; Abraham, A T
    The present study was conducted in the Division of Agricultural Botany, College of Agriculture, Vellayani during the period from March to June 1974. Nine characters in the F3 generation of the intervarietal crosses of rice was studied. The crosses involves three local varieties, Navara, Ptb-28 and Ptb-29 and the two high yielding varieties , Anapurna and Triveni. Correlation of the yield with four characters was also studied. The characters, viz. flowering duration, plant height, total number of tillers, panicle length, grain yield, 1000 grain weight, ear weight and apikelet sterility are inherited quantitatively and are controlled by more than one gene. Spikelet sterility is more in the Anapurna X Navara cross
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    ThesisItemOpen Access
    Effect of defoliation at panicle emergence and anthesis on grain yield in rice (Oryza sativa L.)
    (Department of Agricultural Botany, College of Agriculture, Vellayani, 1978) Syed Moshin, Ibrahim; KAU; Gopinathan Nair, N
    The contributions of the different leaves and the importance of the period between panicle emergence and anthesis to grain filling in three varieties of rice were studied by employing the defoliation technique. Jaya, a medium duration dwarf variety recorded the highest yield and yield components. Of the two short duration varieties the dwarf variety Jyothi performed better than the tall variety Ptb.10. Increasing the severity of^defoliation resulted in further reductions in yield. It was found that only the top three leaves are important in grain filling in rice. The contribution of the third leaf is lower than any of the other two leaves. Flag leaf and penultimate leaf are of equal importance in grain filling in rice. Defoliation stimulated the photosynthetic activity of the remaining green parts which compensated partially for loss of leaves. A short period of eight days between panicle emergence and anthesis was found to be important in grain filling in rice. Damage to the leaves by insects, diseases or other agents at the early heading stage could have drastic effects on grain yield in rice.
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    ThesisItemOpen Access
    Mutagenic efficiency of gamma irradiation in sesamum
    (Division of Agricultural Botany, College of Agriculture, Vellayani, 1975) Ramachandran, Nair N; KAU; Gopinathan, Nair V