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19873
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Subject: Agriculture × Author: KAU × End date: 1987 × Start date: 1987 ×
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    ThesisItemOpen Access
    Variability studies on certain T X CDO F, hybrids of coconut (Cocos nucifera L)
    (Department of Agricultural Botany, College of Horticulture, Vellanikkara, 1987) Sreelatha, P C; KAU; Kumaran, K
    Investigations conducted on variability in 14 F1 parental combinations of T X CDO coconut hybrids at the KADP farm attached to the College of Horticulture, Vellanikkara revealed no significant difference between pollen parents in their contribution to the progenies in any of the 17 characters studied, unlike the female parents. The number of spadices was found to be highly correlated with the number of buttons set followed by the number of functional leaves and number of female flowers produced. The fourteen parental combinations were grouped into three clusters using Mahalanobis’ D2 analysis. Clusters I and II were the most divergent ones. Production of spadices and female flowers were found to be high during March, April and May and absent during October, November and December. Heavy rain during active female phase was found to affect setting of button adversely. Fertility and viability of pollen were found to be very high except during April and May due to high temperature.
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    ThesisItemOpen Access
    Relative biological effectiveness of gamma rays and ethyl methane sulphonate on cardamom varieties
    (Department of Agricultural Botany, College of Agriculture, Vellayani, 1987) Benney Joseph; KAU; Kamalam, N
    The direct effect of 60 Co-gamma rays and ethylmethane sulphonate (EMS) on three varieities of cardomom namely Malabar, Mysore and Vazhukka was studied during the course of present investigation. The experiment was carried out at the Department of Agricultural Botany, College of Agriculture , Vellayani during the year1985-1986. Dry seeds were exposed to gamma rays at dose levels ranging from 10-70 kR at 10 kR interval and the pre-soaked seeds for 16 hours were treated with EMS concentrations ranging from 0.25 % to 1.75% at an interval of 0.25%. Soaked seeds were also exposed to gamma rays with 10 and 20 kR. The experiment was laid out in RBD with two replications. Direct effect of the mutagens was assessed by analysing the effect of various growth metrices like number of days taken to start germination , number of days taken to complete germination from the date of sowing and also from the date of first sprout, rate of germination , germination percentage, survival percentage, growth rate based on plant height , leaf number, leaf area and tiller number , frequency of chlorophyll deficient plants and cytological effects. The data collected were analysed statistically . Since sufficient population was not available at higher doses of both the mutagens they were not considered for growth metric analysis.
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    ThesisItemOpen Access
    Intra and inter varietal variability analyses in cardamom (Elettarla cardamomum Maton)
    (Department of Agricultural Botany, College of Agriculture, Vellayani, 1987) Gopal Radhakrishnan; KAU; Chandramony, D
    The present investigation was conducted at the Cardamon Research Station, Pampadumpara to obtain Information on the magnitude of genetic variability In the population and the extent to which the desirable characters are heritable. Four popular cultivars viz. Malabar, Mysore, Vazhukka and PV-1 of two age groups three and six year old planted at the above station were used for the study. Observations were made on height of tillers, number of productive tiliers/plant, number of leaves/tiller, number of panicles/plant, number of capsules/panicle, fresh weight of capsules/plant, dry weight of capsules/plant, hundred capsule weight, capsule volume, number of seeds/capsule, length of panicle, number of nodes/ panicle and Internodal length In the panicle. The data collected was subjected to studies on genetic variability, estimation of genetic parameters, correlation and path coefficient analysis. Variability analysis revealed that significant differences exsisted among the varieties for eight of the thirteen morphological characters studied. They were number of productive tillers/plant, height of tillers, number of panicles/plant,internodal length in the panicle, number of capsules/panicle, capsule volume, fresh and dry weight of capsules/plant. The variability within the varieties was not significant.