PG Thesis

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    Characterization of viruses associated with mosaic disease of ivy gourd :Coccinia grandis(L.) voigt
    (Department of Plant Pathology,Vellanikkara, 2023-10-09) Silpa, P; Sumiya, K V
    Ivy gourd (Coccinia grandis (L.) Voigt) is an important vegetable and medicinal plant from the cucurbitaceae family. The fruits are used as a green vegetable, while different parts of the plants are utilized in traditional medicine. However, its production is hampered by many fungal and viral diseases. Kerala is one of the major ivy gourd producing states in India. Viral disease is one of the major constraints faced in cultivation of ivy gourd in Kerala. But no study has been conducted in Kerala to identify and characterize viruses of ivy gourd. Hence, in an endeavor to get the information on the viruses causing mosaic disease on ivy gourd in Kerala, the present study was conducted to identify and characterize the viruses causing mosaic disease of ivy gourd in Kerala. Purposive sampling survey was conducted in ivy gourd growing areas of Palakkad, Malappuram and Thrissur district of Kerala. Highest Percent Disease Incidence (PDI) of mosaic in ivy gourd was recorded from the fields of Kizhakkanchery (100%) in Palakkad district.
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    Cytomorphological and chemical studies on intervarietal crosses of Capsicum annuum, L.
    (Division of Agricultural Botany, Agricultural College & Research Institute, Vellayani, 1970) Manikantan Nair, P; Mary K George
    1. The cytomorphological and chemical aspects of four F1 hybrids of crosses involving five varieties of Capsicum annuum L. were studied . The variety ' Local blue' which possessed mosaic resistance , prolific bearing habit , long life span and high pungency was selected as the common seed parent. The selected pollen parents were, Russian, Indian long red , Chinese giant and Oskosh which were gifted with a higher content of ascorbic acid and sucrose and larger fruit size , but lacking the qualities of the common seed parent. 2. All the four F1 hybrids manifested a marked degree of heterosis in many economically important attributes like , carliness in blooming, number of leaves, number of branches, leaf area and chemical constituents like ascorbic acid and sucrose. 3. An intermediate condition was observed with regard to height , spread, number of fruits, fruit size and number of F2 seeds