Browsing by Author "George, T E"

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Biometrical studies in ash gourd
(Department of Olericulture,College of Horticulture, Vellanikkara, 1981) George, T E; Gopalakrishnan, P K
A field experiment was laid out during 1979-80 at the instructional farm, College of Horticulture, Kerala Agricultural University, Vellanikara to estimate genetic variability, correlations, path coefficients and selection indices in ash gourd
Biometrical studies in cashew (Araeardium occidentale L.) hybrids
(Department of Pomology and Floriculture, College of Horticulture, Vellanikkara, 1992) Manoj, P S; George, T E
An investigation to determine the extent of variability and degree of association of quantitative characters in cashew and to evaluate F1 hybrids of cashew for growth parameters, floral traits, yield attributes and apple characters was carried out with ten year old fifty six F1 hybrids of cashew belonging to twelve parental combinations at the Department of Pomology and Floriculture, College of Horticulture, Vellanikkara during 1990-92. The hybrids and parents were evaluated for four growth parameters, five floral traits, six yield attributes and seven apple characters for two seasons. Variability studies showed that wide variability in terms of range and coefficient of variation existed in the hybrids as well as parents for all the characters studied. Hybrids showed the highest degree of variation for the character nut yield per tree followed by titrable acidity and per cent hermaphrodite flowers. Nut yield per tree exhibited maximum significant positive correlation with mean canopy spread followed by girth of the tree, number of nuts per panicle, weight of kernel, duration of flowering, leaf area, height of the tree and individual nut weight. Weight of the kernel displayed the highest positive direct effect on nut yield per tree followed by mean canopy spread and number of nuts per panicle while individual nut weight and weight of apple had negative direct effects. The correlation studies and path coefficient analysis identified the important biometric characters which contribute towards nut yield per tree in cashew as weight of kernel, mean canopy spread, number of nuts per panicle, girth of the tree, leaf area, duration of flowering and height of the tree in that order of priority. The principal component analysis and step-wise regression procedure gave two yield prediction models for cashew with the latter having a higher R2 value. Based on the discriminant function analysis, and selection index values, six hybrids viz., H-342, H-402, H-419, H-354, H-376 and H-340 were identified as superior to the rest of the hybrids studied. All these selected hybrids exhibited heterosis for nut yield per tree over their respective mid-parents, better parents and standard variety Madakkathara -1. They also showed standard heterosis for individual nut weight and weight of karnel and had superior export grades.
Breeding for resistance to mosaic viruses in pumpkin (Cusurbita moschata Poir)
(Department of Olericulture, College of Horticulture, Vellanikkara, 1998) Jessy M Kuriakose; George, T E
Genetic improvement of bird pepper (Capsicum Frutescens L.) by selection
(Department Of Olericulture, College Of Horticulture, Vellanikkara, 1998) Sheela, K B; George, T E
Isozyme variation Areca catechu L. and allied species
(Department of Plantation Crops and Spices, College of Horticulture, Vellanikkara, 2002) Arul Swaminathan, A; George, T E
Investigations on "Isozyme variation 10 Areca catechu L. and allied species" were undertaken in the Department of Plantation Crops and Spices and the Biochemistry laboratory of the College of Horticulture, Kerala Agricultural University, Vellanikkara during the period from 2000 to 2002 with the major objectives of working out the species relationship in the genus Areca and biochemically characterizing the varieties/cultivars/types of arecanut by isozyme , analysis. .:' Twenty four arecanut accessions comprising of four species, five released varieties, 12 traditional cultivars and three exotic cultivars collected from various states were included in the investigation. The isozymes studied were peroxidase, esterase and polyphenol oxidase. The species VIZ., Areca catechu, A. triandra, A. lutescens and A. normanbyii were displayed variations with respect to the isozyme banding patterns, while no variation was observed among the five released varieties. Traditional cultivars numbering 12 had shown very little variation except in the case of TC3 and TC10. The exotic cultivars, which included two YLD tolerant accessions, had shown a striking variation when compared to other accessions of A. catechu. Based on the banding pattern of all the isozymes, the accessions were classified into eight groups. The dendrogram plotted using cluster analysis also vindicated this classification. The protein content of the accessions ranged from 3.4 to 8.8 mg/ml extract. The protein content was very high in the YLD tolerant accessions when compared to the susceptible genotypes. The activity of the enzyme peroxidase recorded a wide range of 120 - 1455 units/ml while the range of polyphenol oxidase was 22 - 208 units /ml. The activity values of peroxidase and polyphenol oxidase were very low in all the YLD tolerant lines in comparison with other accessions. High protein content alongwith low enzyme activity levels recorded invariably by all the tolerant accessions point towards a possible influence of these biochemical parameters on YLD tolerant reaction.
Seed invigoration and dormancy studies in snake gourd
(Department of Olericulture, College of Horticulture,Vellanikkara, 2005) Mohan, N; George, T E
Standardisation of layering medium, planting medium and containers for cashew air layers
(Kerala Agricultural University, 1983) Veeraraghavan, P G; George, T E; Nair, M N C