Browsing by Author "Sreelathakumary, I"

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Characterization and in vitro multiplication of bittergourd (Momordica charantia L.) genotypes
(Department of Olericulture, College of Agriculture, Vellayani, 2009) Resmi, J; Sreelathakumary, I
Chartacterization of landraces of ashgourd (Benincasa hispida (Tunb.) Cogn.)
(Department of Olericulture, College of Agriculture, Vellayani, 2004) Reshmi, J; Sreelathakumary, I
Development of chilli (capsicum annuum l.) hybrids with leaf curl virus resistance, high yield and quality
(Department of Vegetable Science, College of Agriculture , Vellayani, 2019) Vijeth, S; Sreelathakumary, I
Development of F1 hybrids in chilli (Capsicum annuum L.) for commercial cultivation
(Department of Olericulture, College of Agriculture, Vellayani, 2015) Mopidevi M, Nagaraju; Sreelathakumary, I
Evaluation of cabbage (Brassica oleracea L.Var.capitata) for Southern Kerala
(Department of Olericulture, College of Agriculture, Vellayani, 2013) Divya, P; Sreelathakumary, I
Evaluation of hybrids for yield and quality in chilli (Capsicum annuum L.)
(Department of Olericulture, College of Agriculture,Vellayani, 2016) Aiswarya, C S; Sreelathakumary, I
The research projec t entitled “Evaluation of hybrids for yield and quality in chilli ( Capsicum annuumL.)” was conducted at Department of Olericulture, College of Agriculture, Vellayani during 2015-16. The objective of the study was to evaluate the yield and quality characters of F1 hybrids of chilli. The experimental material consisted of five parents viz., CA 3 (P1), CA 5 (P2), CA 6 (P3), CA 8 (P4) and CA 32 (P5) and 10 F1s produced in diallel mating design excluding reciprocals. The hybrid Arka Harita and variety Vellayani Athulya were used as checks for the estimation of standard heterosis. The experiment was laid out in Randomized Block Design (RBD) with 17 treatments and three replications for two seasons viz., May 2015 to September 2015 and October 2015 to February 2016. Analysis of variance showed significant differences among the treatments for almost all characters studied. Among the hybrids P4 x P5 recorded the highest fruit weight (9.66 g), flesh thickness (2.81 mm), green fruit yield plant-1 (962.93 g), dry fruit yield plant-1 (144.05 g) and yield plot-1 (27.72 kg). Maximum fruits plant-1 was recorded in the hybrid P3 x P4(148.76), fruit length in P1 x P5(12.61 cm) and fruit girth in P3 x P5 (4.43 cm). Among the parents P5 recorded highest fruit weight (6.73 g), flesh thickness (2.61 111m), green fruit yield plant-1 (448.70 g), dry fruit yield plant-1 (79.98 g) and yield plot-1 (12.91 kg). The hybrid P2 x P5 had high quality parameters like oleoresin (18.90 %), ascorbic acid (122.66 mg/lOOg) and colour value (195.39 ASTA units). The check variety Vellayani Athulya was superior for characters such as days to first flower (23. 83 days), days to first harvest (42.96 days), fruit length (12.66 cm), fruit girth (6.27 cm), fruit weight (17.36 g) and flesh thickness (3.31 mm). No incidence of white fly, bacterial wilt, leaf curl, fruit rot and mosaic were observed in the field. The incidence of thrips and mites were less in the parents and hybrid combinations. The highest standard heterosis for green fruit yield plant'1 among the hybrids was recorded in P4 x P5 (177.23 %) followed by P3 x P5 (147.35 %), and P2 x P5 (127.24 %). For fruit weight highest standard heterosis was observed in P4 x P5 (191.09 %) followed by P3 x P5 (188.12 %) and P2 x P5 (170.30 %). Maximum standard heterosis for yield plot'1 was recorded in P4 x P5 (177.34 %), P3 x P5 (147.35 %) and P2 x P5 (127.31 %). Among the hybrids the highest standard heterosis for the quality characters such as oleoresin (36.59 %), ascorbic acid (6.05 %), and colour value (8.17 %) were recorded in P2 x P5. Correlation for different characters showed that green fruit yield plant"1 had positive correlation with the primary branches plant'1, fruits plant"1, fruit length, fruit weight, flesh thickness and seeds fruit'1. On the basis of the present study the hybrids CA 8 x CA 32 (P4 x P5), CA 6 x CA 32 (P3 x P5) and CA 5 x CA 32 (P2 x P5) were found promising for yield characters such as fruit weight, green fruit yield plant'1, yield plot'1 and quality. Among the parents CA 32 (P5) was found superior. The superior hybrids identified viz., CA 8 x CA 32 (P4 x P5), CA 6 x CA 32 (P3 x Ps) and CA 5 x CA 32 (P2 x Ps) can be subjected to multilocational trials and if found superior can be recommended for variety release.
Genetic analysis of shade tolerance in chilli (Capsicum spp.)
(Department of Olericulture, College of Agriculture, Vellayani, 2000) Sreelathakumary, I; Rajamony, L
Investigation on 'Genetic analysis of shade tolerance in chilli (Capsicum spp.)' was carried out in the Department ofOlericulture, College of Agriculture, Vellayani, during 1997 - 2000 with the objective of identifying superior genotype(s) of chilli to yield better under shade and to analyse the physiological, anatomical, biochemical and genetic basis of shade tolerance. Seventy genotypes of chilli belonging to C. annuum, C. Jrutescens and C. chinense collected from different parts of the country were initially evaluated under 25, 50 and 75 per cent shade in comparison with open condition for shade tolerance and yield. Plant height, internodal length, stem girth, leaf area, petiole length, days to first flower, node to first flower, height of node to first flower, fruits per plant, fruit length, fruit girth, fruit weight, yield and incidence of mite were found significantly different both among the genotypes and between different shade levels. High heritability combined with high GCV and expected genetic advance was observed for fruits per plant, fruit weight, fruit length, fruit girth, leaf area and yield under shade indicating the possibility of improvement of these characters through selection. A positive correlation was observed for fruits per plant, fruit length and fruit weight with yield at genotypic and phenotypic levels. CA 38 of C. annuum, CF 51 of c. Jrutescens and CC 63 of C. chinense were identified as shade tolerant and CA 39 of C. annuum, CF 46 of C. Jrutescens and CC 66 of C. chinense as shade susceptible genotypes. The shade tolerant genotypes were found to be superior in maintaining higher LAl, SLW, CGR, RGR and NAR under shade than shade susceptible ones. Genotypes grown under open had thicker leaves with more stomates per unit area. Anatomical attributes viz., upper and lower epidermal cells, palisade and spongy mesophyll cells and vascular bundle thickness were maximum in open. The increase in chlorophyll ~, h and total chlorophyll under shade was prominent in shade tolerant genotypes than that of susceptible ones. A decreasing trend was observed in chlorophyll ~ / h ratio in all the genotypes due to prominent increase of chlorophyll h fraction. The shade tolerant genotypes were found to maintain higher proline and total phenol content under shade compared to shade susceptible genotypes. Capsaicin, oleoresin and ascorbic acid content did not vary significantly due to shade. Under open condition the genotypes recorded higher carotenoid content. A polygenic system of inheritance with non-allelic interaction was revealed in shade tolerance. Duplicate type of epistasis with additive, additive x additive, dominance and dominance x dominance components of genetic variances could observe.
Genetic cataloguing of hot chilli (Capsicum chinense Jacq.) types of Kerala
(Kerala Agricultural University, Vellanikara, 2002) Manju, P R; Sreelathakumary, I
Genetic variability, heritability and genetic advance in hot chilli (Capsicum chinense Jacq.)
(Kerala Agricultural University, Vellanikara, 2002) Manju, P R; Sreelathakumary, I
Thirty-two accessions of hot chilli (Capsicum chinense Jacq.) were evaluated to estimate the variability, heritability and genetic advance in randomized block design with three replications. Higher phenotypic and genotypic coefficients of variation were observed for fruits per plant, yield per plant, seeds per fruit and fruit weight. High estimates of heritability coupled with high genetic advance were also observed for these characters, indicating that they can be effectively improved through selection.
Identification of paprika (Capsicum annuum L) genotype(s) for yield and quality characters
(Department of Olericulture, College of Agriculture,Vellayani, 2012) Lekshmi, S L; Sreelathakumary, I
The experiment entitled “Identification of paprika (Capsicum annuum L.) genotype(s) for yield and quality characters” was conducted at the Department of Olericultue, College of Agriculture, Vellayani, during the period 2011-2012. The study envisaged assessment of genetic variability in paprika and to study the influence of harvest maturity on quality parameters. Fifty three accessions of paprika were collected from different parts of country and grown in the field in RBD with three replications. The analysis of variance revealed highly significant differences among the 53 accessions of paprika for all the characters studied viz., plant height, primary branches, days to flowering, days to maturity, node to first flower, height of node to first flower, fruit length, fruit girth, fruit weight, fruits per plant, yield per plant, pedicel length, fruit: pedicel ratio, flesh thickness, seeds per fruit, flesh: seed ratio, driage, oleoresin, colour, ascorbic acid, capsaicin, bacterial wilt and leaf curl virus incidence. Among the accessions CA 6 recorded highest yield per plant (776.12 g) and CA 12 recorded maximum number of fruits (265.33). Fruit weight was highest in CA 47 (13.43 g). High phenotypic coefficient of variation and genotypic coefficient of variation were observed for yield per plant, fruits per plant, fruit weight and primary branches per plant. High heritability and high genetic advance also observed for these characters. The path analysis revealed that fruit weight, fruits per plant, plant height and primary branches had direct effect on yield per plant. Correlation and path analysis revealed that fruits per plant is the primary component as evident from the positive correlation as well as high direct and indirect effect on yield. Maximum oleoresin content was observed in CA 7 followed by CA 29 and CA 37. CA 2 recorded a high color value with pungency and CA 37 recorded a high colour with low pungency. CA 38 recorded maximum ascorbic acid content. CA 34 and CA 40 had the minimum pungency and CA 10 recorded the maximum pungency. Bacterial wilt and leaf curl virus incidence among the 53 accessions were studied. CA 33, CA 34, CA 35 and CA 47 recorded less incidence of both diseases. Based on Mahalanobis D2 analysis the current genotypes were grouped into four clusters. Cluster I was the largest with 34 accessions, followed by cluster IV with 15 accessions and cluster II with three accessions. Cluster III had only one accession. In the present study maximum divergence was observed between clusters II and IV as shown by their high intercluster distance. The minimum intercluster distance observed between the clusters I and II indicated a close relationship among the accessions. Based on selection index including both quantitative and qualitative characters CA 34 (Local, Dharwad) was ranked first followed by CA 7, CA 6, CA 33 and CA 35. The accessions were genetically catalogued and the result revealed distinct variations among the accessions for vegetative, inflorescence, fruit, seed and quality characters. Quality characters showed significant differences among the accessions and harvest maturity stages. Oleoresin, colour and capsaicin content in the paprika fruits were found to increase as the age of the fruits increased. Ascorbic acid content in the fruits increased from turning stage to red ripe and then declined. On the basis of the present study the high yielding accessions can be grouped into low pungent and pungent paprika. Among the low pungent, high yielding accessions CA 34, CA 33 and CA 35 recorded high colour value also. CA 6 and CA 7 are promising high yielding pungent paprika accessions. These accessions can be utilized for further crop improvement programmes.
Identification of photo insensitive genotypes(s) of winged bean (Psophocarpus tetragonolobus (L.) DC.)
(Department of Olericulture, College of Agriculture, Vellayani, 2014) Prasanth, K; Sreelathakumary, I
The present investigation entitled “Identification of photoinsensitive genotype(s) of winged bean (Psophocarpus tetragonolobus (L.) DC.)” was conducted at the Department of Olericulture, College of Agriculture, Vellayani, during 2013-2014. The study envisaged identification of photo insensitive, high yielding and year round fruiting genotype(s) of winged bean suitable for cultivation in Kerala. Twenty one genotypes of winged bean were collected from different parts of Kerala, state agricultural universities and available germplasm of the Department of Olericulture, College of Agriculture, Vellayani were grown in the field in RBD with three replications. Analysis of variance showed significant difference between the genotypes for almost all the characters studied. Among the genotypes, PT 21 recorded earliness for flowering, flowering commences in June (75 DAS) and had highest yield (2703.33 g) and pods per plant (154.49). This is followed by PT 14 and PT 19. Also the genotypes PT 21, PT 1 and PT 4 showed prolonged harvest up to February, irrespective of photoperiod and temperature. The genotypes PT 18 and PT 7 showed typical short day nature i.e., the flowering was recorded in October. High phenotypic and genotypic coefficients of variation were observed for most of the yield contributing characters. High heritability coupled with high genetic advance was observed for characters like primary branches per plant, days to first flowering, days to 50 per cent flowering, days to first harvest and yield per plot, pod weight, seeds per pod and 100 seed weight. The highest phenotypic and genotypic correlation with yield was observed for pods per plant. The path analysis revealed that pods per plant exhibited the highest positive direct effect on pod yield followed by pod length and pod girth. The twenty one genotypes were grouped in to five clusters based on Mahalanobis D2 analysis. Cluster III was the largest with six genotypes followed by cluster I and II with five genotypes each. Cluster IV had only one genotype and cluster V with four genotypes. The intercluster distance was maximum between cluster II and cluster V where as it was minimum between the cluster I and cluster III. The selection indices were worked out for twenty one genotypes based on yield and yield attributing characters. Genotype PT 21 (Nemom collection) was ranked first followed by PT 6 (local collection, Munnar), PT 1 (Parassala collection), PT 4 (Anchal collection) and PT 7 (local collection, Palakkad). Genotypes PT 21, PT 1, and PT 4 showed photoinsensitivity i.e., flowering and fruiting irrespective of photoperiod and had long fruiting period. On the basis of the present study PT 21, PT 1 and PT 4 were identified as the high yielding, photoinsensitive genotypes suitable for year round cultivation and can be utilized for further crop improvement programmes.
Quality characterization of hot chilli (Capsicum Chinese Jacq.) genotypes in rainy and summer seasons
(Department of Olericulture, College of Agriculture, Vellayani, 2003) Robi, R; Sreelathakumary, I
The research project “Quality chracterization of hot chilli (Capsicum chinense Jacq.) genotypes in rainy and summer seasons” was carried out in the Department of Olericulture, College of Agriculture, Vellayani during 2001 to 2003. The objectives of the study were assessing the magnitude of genetic variability in C. chinense and for identifying superior genotypes for yield and quality based on season and stage of maturity. Ten selected superior genotypes obtained from the preliminary germplasm evaluation trial were used for the study in the two seasons. Analysis of variance revealed significant difference among the genotypes for all the characters studied in both seasons. In rainy season high PCV and GCV were recorded for fruits per plant followed by oleoresin. High heritability coupled with high genetic advance was observed for fruits per plant, oleoresin content and yield per plant. Correlation studies and path coefficient analysis revealed that fruits per plant is the primary yield component as evidenced from its high positive correlation as well as high direct and indirect effects on yield. Significant variation among two seasons was observed for primary branches per plant, days to first flowering, days to harvest, fruit length and yield per plant. The genotypes were generally late in summer for flowering and harvesting. Genotype CC 13 was the earliest in flowering and CC 30 in harvesting in both the seasons. Fruits per plant and yield per plant was maximum in rainy season. In both the seasons, maximum fruits were produced by CC 3 and maximum yield by CC 30. Genotype CC 3 had maximum capsaicin, CC 28 had maximum oleoresin and CC 7 had maximum carotenoid and ascorbic acid content. Quality characters showed significant difference among genotypes, season, maturity and their interactions. Genotypes had good quality in summer. Capsaicin, oleoresin and carotenoid increased as age of fruit increased and reached the maximum at withering stage, whereas ascorbic acid was increased upto red ripe stage and then declined. Bacterial wilt was serious during summer and leaf curl disease during rainy season
Quality parameters in hot chilli (Capsicum chinense Jacq.)
(Kerala Agricultural University, Vellanikara, 2002) Manju, P R; Sreelathakumary, I
Thirty two accessions of hot chilli (Capsicum chinense Jacq.) were evaluated in a randomized block design with three replications during September 2000 to May 2001 for quality parameters namely, capsaicin, oleoresin and ascorbic acid contents. Analysis of variance revealed significant differences among the accessions. High phenotypic and genotypic coefficients of variation along with high heritability and genetic advance was observed for all the characters. Correlation studies indicated a positive association of capsaicin with oleoresin, primary branches per plant and pollen viability and a negative association with pedicel length and fruit weight.
Standardization of agrotechniques for precision farming in watermelon [Citrultus lanatus (Thunb.) Mastum. & Nakai]
(Department of Olericulture, College of Agriculture, Vellayani, 2017) Nisha, S K; Sreelathakumary, I