1. KAUTIR (Kerala Agricultural University Theses Information and Retrieval)

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    Effect of crop regulation on yield and quality of mango (Mangifera indica L.) under high density planting system
    (Department of Fruit Science, College of Horticulture, Vellanikkara, 2019) Amritha Manohar; Jyothi Bhaskar
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    Standardization of in vitro male bud culture in banana musa (AA) 'kadali'
    (Department of Fruit Science, College of Horticulture Vellanikkara, 2018) Lakshmi, K S; Jyothi Bhaskar
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    Palynological approach to screen coconut genotypes for high temperature tolerance
    (Academy of Climate Change Education and Research Vellanikkara, 2017) Anusree R Nair; Hebbar, K B
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    Evaluation of tomato (Solanum lycopersicum L.) hybrids for yield and bacterial wilt resistance
    (Department of Olericulture, College of Agriculture, Vellayani, 2017) Shashidhar M Sonnad; Sarada, S
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    Characterization of kuttiattoor mango (Mangifera indica L.) Cultivar of Kannur district, Kerala
    (Department of Plant Breeding and Genetics, College of Horticulture, Vellanikkara, 2017) Reshma Reghu; Elsy, C R
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    Evaluation and characterisation of promising hybrids of long pepper (Piper longum L.)
    (Department of Plantation Crops and Spices, College of Horticulture, Vellanikkara, 2017) Sruthy, K; Sujatha, V S
    Piper longum L., commonly known as long pepper, belongs to family Piperaceae. The species has originated in South Asia. Piper longum is an important medicinal plant used in more than 300 ayurvedic preparations. Inspite of the importance of the species, „Viswam‟ is the only variety released so far. As a part of a KSCSTE funded project, hybridization studies were carried out at the Department of Plantation Crops and Spices, College of Horticulture, Vellanikkara to develop high yielding types in Piper longum. In the preliminary evaluation trials, four hybrids were found promising. The present study entitled „evaluation and characterisation of promising hybrids of long pepper (Piper longum L.)‟ was conducted with the objective of evaluating these promising hybrids at different shade levels for growth, yield and quality and also to characterise them using molecular markers. The research was conducted in three experiments viz., evaluation of hybrids in pots at different shade levels, field evaluation of selected hybrids and molecular characterisation of promising hybrids and parents. Morphological characterisation of the accessions was done using IPGRI descriptor for Piper nigrum with necessary modifications. Variations were observed among accessions in shape of leaf, immature and mature spike color as well as shape of spike. Characters like plant height, number of primary branches per plant and time taken for production of first lateral were significantly different among hybrids. Flowering and fruit set were higher at zero per cent and 25 per cent shade compared to 50 per cent shade level. Field planted genotypes of P. longum showed significant difference in number of primary branches, internodal length of orthotropic as well as plagiotropic shoots and leaf area. Characters like pedicel length, spike length, spike girth and yield in terms of number of spikes per plant, fresh weight of spikes per plant and dry spike yield per plant also differed significantly. Among the hybrids evaluated in the field, Pl 9 followed by Pl 63 were found to be promising. They were significantly higher yielders compared to other hybrids, female parent and Viswam. Essential oil content was found to be uniform (0.8 per cent) in all the accessions except Pl 141 (0.83 per cent). Pl 9 showed maximum oleoresin (15.2 per cent) and piperine (3.47 per cent) content than other genotypes. For molecular characterisation using RAPD, 30 decamer primers were screened. From these ten best primers were selected. Six primers showed polymorphism between the male and female parents. The hybrids Pl 9 and Pl 63 were closely related with 92 per cent similarity. Pl 140 was found different from the rest of the three hybrids and it was grouped along with the parents. Among the accessions studied, Viswam showed highest variability from others. Among the hybrids evaluated, Pl 9 and Pl 63 were found to be promising in terms of yield. Pl 9 was superior in quality. These hybrids could be further evaluated in multi-location trials to explore the possibility of releasing as high yielding hybrids in future.
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    Response of tomato to calcium and boron in the onattukara tract of Alappuzha district
    (Department of Soil Science and Agricultural Chemistry, College of Agriculture, Vellayani, 2017) Aswathy Mohan; Indira, M
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    Diversity analysis and reproductive biology of milk yam (Ipomoea digitata L.)
    (Department of Plantation Crops and Spices, College of Agriculture, Vellayani, 2017) Vidya, K M; Jessykutty, P C
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    Karyomorphology, Pollen sterility and seedset in Vetiver (Vetiveria zizanioides (Linn) Nash.)
    (Department of Agricultural Botany, College of Horticulture, Vellanikkara, 1989) Mini, K S; Viswanathan, T V
    Investigations on karyomorphology, pollen sterility and seedset in Vetiveria zizanioides were undertaken using eleven cultivars of Vetiver, including North Indian type, South Indian type and one hybrid. The observations on plant morphology indicated no clearcut morphological features employable for exact identification of North Indian and South Indian types of Vetiver. The somatic chromosome number was observed constant in all cultivars ie. 2n = 20. However, the different cultivars differed cytologically with respect to chromosomal characters like size and shape, total chromatin content and meiotic configurations during different stages of division. Presence of meiotic abnormalities like bridges and laggards were observed in all cultivars with highest frequency in O D V - 4. This cultivar also showed high percentage of pollen sterility. A direct relationship between meiotic abnormalities and pollen sterility was noticed. Studies on seedset pattern of different cultivars revealed very low set, mostly nil upon selfing, while all the cultivars produced fairly high quantity of seeds upon open pollination.
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    Validation of apomixis and transcriptome analysis for detection of the genes related to apomixis in black pepper (piper nigrum L.)
    (Centre for Plant Biotechnology and Molecular Biology, College of Horticulture, Vellanikkara, 2017) Rohini Rajkumar Bansode; Valsala, P A