Browsing by Author "Chandramony, D"

Now showing 1 - 12 of 12

Artifical induction of polyploidy in cucumis sativus L
(Department of Agricultural Botany, College of Agriculture, Vellayani, 1993) Girish Kumar, K G; Chandramony, D
Combining ability studies in tomato (lycopersicon esculentum mill)
(Department of Plant Breeding and Genetics, College of Agriculture, Vellayani, 1995) Seeja, G; Chandramony, D
An experiment in tomato (Lycopersicon esculentum Mill.) was carried out at the Department of Plant Breeding and Genetics, College of Agriculture, Vellayani during 1993-94, with the objective of estimating the combining ability of parents and gene action, involved in the inheritance of different yield attributes. The study was conducted in a line x tester model, using three bacterial wilt resistant varieties as lines and five popular varieties as testers. The three bacterial wilt resistant varieties (lines) were Arka Abha, Arka Alok and Sakthi. The five popular varieties (testers) were LE 312, LE 370, LE 373, RFH-1 and PKM-1. These eight parental varieties and 15 hybrids were planted in the field in RBD, with three replications. Observations recorded were plant height, number of branches/plant, growth habit, spread of the plant, period of harvest, individual fruit weight, number of fruits/plant, fruit yield/plant, number of leaves/plant, pericarp thickness, locules/fruit, size of fruit and pest and disease incidence. Analysis of variance revealed highly significant differences among the genotypes for all the characters. Gca alone was significant for number of branches/ plant while sca alone was significant for spread of the plant and pericarp thickness. Both gca and sca were significant for the remaining characters such as plant height, period of harvest, individual fruit weight, fruits/ plant, fruit yield/plant, leaves/plant, locules/fruit and size of fruit. The additive to dominance variance ratio indicated a preponderance for non additive gene action in the above characters. Combining ability analysis showed that all the three lines viz., Arka Abha, Arka Alok and Sakthi were good general combiners with respect to fruit yield and other yield attributes whereas the testers were good general combiners, for the different vegetative characters such as plant height, branches and leaves/plant. Among the 15 hybrids combinations, significant sca and heterosis were observed in the hybrids such as Arka Abha x LE 370, Arka Alok x PKM-1, Arka Alok x LE 312, Arka Abha x RFH-1 and Sakthi x RHF-1. Among these hybrids, Arka Abha x LE 370 showed significance for fruit yield, individual fruit weight, size of fruit, plant height, leaves/plant, branches/plant and also showed resistance to mosaic, leaf cur1 and fruit borer. This hybrid exhibited indeterminate growth habit. The hybrid Arka Alok x PKM-1 showed significance for fruits/plant, fruit yield/plant, plant height and leaves/plant. The combinations Arka Alok x LE 312 and Arka Alok x RFH-1 showed high sca and heterosis for individual fruit weight, fruit size and pericarp thickness, and also high heterosis for fruit yield/plant. Among these, Arka Aloka 312 showed indeterminated growth and Arka Alok x RFH-1 showed semi determinate growth habit. Sakthi x RFH-1 exhibited high sca for fruit yield/plant and heterosis for fruit number and individual fruit weight. This hybrid also showed resistance to leaf curl and mosaic. This hybrid showed determinate growth habit. Therefore these hybrids can be utilized for further crop improvement programme.
Cytogenetic studies on intervarietal hybrids of sesamum (Sesamum indicum L.)
(Department of Agricultural Botany, College of Agriculture Vellayani, Trivandrum., 1984) Chandramony, D; Krishnan Nair, N
Effect of 'planofix' foliar spraying on some varieties of capsicum
(Kerala Agricultural University, 1976) Chandramony, D; Mary K George
Gene action and heterosis for yield, quality and fruit borer resistance in tomato (lycopersicon esculentum mill)
(Department of Plant Breeding and Genetics, College of Agriculture, Vellayani, 2002) Ebenezer Babu Rajan, R; Chandramony, D
Genetic analysis in ivygourd (Coccinia grandis (L) viogt)
(Department of Plant Breeding and Genetics, College of Agriculture, Vellayani, 2003) Siby Varghese; Chandramony, D
The present investigation entitled "Genetic Analysis in Ivygourd (Coccinia grandis (L) Voigt.) was conducted at the Department of Plant Breeding and Genetics, College of Agriculture, Vellayani during 1999-2001. Objective of the study was to estimate the genetic basis of different characters, genetic divergence in the germplasm and to formulate a selection index for identifying superior types. The material for the experiment was 90 different local cultivars collected from different agroclimatic regions. The data for the investigation were collected from two field experiments, each laid out in Randornised Block Design with three replications. In Experiment I a collection of 50 genotypes of ivygourd was grouped into 11 clusters using Mahalanobis D2 statistic and based on eight morphological characters. Five genotypes Kuriyabandar local I, Kuriyabandar local Ill, Pilangatta local 11 & III and Kudlu local I, could not be grouped with others and so are kept as independent clusters. The cluster C IX was found to have maximum intercluster distance with seven of the eleven clusters formed. This was followed by C 11 which showed maximum divergence with four out of the eleven clusters. The results suggest that selection of parents from these divergent clusters will be effective in future hybridisation programme. The three superior crosses identified were Balthangadi local I x Pilangatta local 11, Bandargrarn local I x Pilangatta local 11 and Seetharnbeta local I x Pilangatta local II. Number of flowers per plant and number of leaves per plant were found to be the two characters that contributed maximum for the divergence of the genotypes. So both at phenotypic and cluster levels, these two characters can be considered as potential contributors of differentiation in Jvygourd. In Experiment II the data collected from 40 genotypes of ivygourd were subjected to analysis of variance and the genetic parameters like variability, heritability; genetic advance, correlation coefficients and path coefficients were estimated. Based on the above observation, a selection index was also formulated. Significant genotypic differences were observed among the 40 genotypes for all of the sixteen characters studied. High genetic variability was expressed by the characters fruit yield per plant, number of fruits per plant and number of flowers per plant. High heritability along with a good genetic advance was found for all the characters studied, except for number of days for first flower opening which exhibited high heritability and low genetic advance. These results indicate that the selection of plants which are phenotypically superior with respect to fifteen of the characters studied will certainly result in a significant improvement in the next generation. The genotypic correlation coefficients were higher than the corresponding phenotypic and environmental correlation coefficients revealing the fact that phenotypic expression of these correlations are reduced due to the influence of the environment. Yield per plant exhibited positive association with all the characters except number of days for flowering, which had significant negative correlation with yield. Number of fruits per plant and single fruit weight were the characters with high direct and indirect effects. Based on the above results, a selection index was formulated and local cultivars of Alappuzha, Kanjangad, Thirunelli, Mancheswararn and Nangikadapurarn were identified as the five top ranking genetically superior ivygourd genotypes. To sum up, the results of the present study indicates that being strictly a cross pollinated crop with possibility for vegetative propagation, methods of breeding which can. be successfully followed are individual plant selection, mass selection to improve varieties, pedigree method and heterosis breeding and vegetative propagation of the heterotic combinations. Considerable variability of the crop has been observed in Kamataka, Andhra Pradesh, Tarnil Nadu and northern parts of Kerala. There is considerable scope for survey, collection and maintenance of germplasm. The study highlights the feasibility of producing commercially viable indigenous selections and hybrids which are early, producing more number of bold and tender fruits with good storability and resistance to pest and diseases.
Genetic basis of seed yield and seed quality in sesame (Sesamum indicum L.)
(Department of Plant Breeding and Genetics, College of Agriculture, Vellayani, 2002) Shajan, V R; Chandramony, D
Incompatibility studies on sweet potato (Jpomoea batalas (L) Lam)
(Division of Agricultural Botany, College of Agriculture, Vellayani, 1983) Padma Kumar, A; Chandramony, D
In a study conducted on the flowering and natural fruit setting in sweet potato (Ipomoea batatas (L.) Lam). It was observed that varietal difference did exist for the above trait. Of the thirty varieties screened for compatibility/incompatibility reactions, only one variety viz. S.378 was found to be self-compatible. Except 2, 4-D treatment and end of season pollination, all the other methods including bud pollination, surgical techniques, application of sugar solution etc failed completly to break the self - incompatibility barrier in sweet potato. The success of 2, 4-D treatment , which resulted in fruit set in 13 varieties might be due to its effect on increasing the flower life by preventing floral absisaion.
Intra and inter varietal variability analyses in cardamom (Elettarla cardamomum Maton)
(Department of Agricultural Botany, College of Agriculture, Vellayani, 1987) Gopal Radhakrishnan; 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.
Nutritional effects of calcium, magnesium, silica and sodium chloride on certain anatomical characters of rice plant related to lodging
(Kerala Agricultural University, 1975) Chandramony, D; Mary, K George
The anatomical changes induced by the application of elements like Calcium Magnesium, Silica and Sodium chloride and their relationship with lodging resistance were studied in one lodging variety. The study indicates the differential effects of Calcium and Magnesium on the anatomical characters of nee Calcium weakens the straw strength and favours lodging by producing large thin walled cells while Magnesium resist the lodging tendency by producing small but thick and compact cells. Silica and Sodium chloride also, to same extent induce anatomical changes favourable for lodging resistance.
Nutritional effects of nitrogen on certain anatomical characters of rice plant related to lodging
(Kerala Agricultural University, Vellanikara, 1968) Chandramony, D; Mary K, George; Kumara Pillai, P
Study of varietal performance of soya beans
(Kerala Agricultural University, 1975) Mary K George; Chandramony, D; Manikantan Nair, P