Browsing by Author "Abdul Vahab, M"

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Arka jyothi - a promising watermelon hybrid
(Kerala Agricultural University, 1993) Abdul Vahab, M; Devadas, V S; Peter, K V
Combining ability analysis in cowpea (Vigna unguiculata [L| walp)
(Kerala Agricultural University, 1998) Sobha, P P; Abdul Vahab, M; Krishnan, S
Combining ability was studied in a 10 x 10 diallel cross in cowpea for nine important characters. The variance due to general combining ability and specific combining ability showed both additive and non-additive gene action for plant height, primary branches, days to flowering, pod length, pod weight, pods per plant, seeds per pod, 100 seed weight and yield per plant. Among ten parental lines, Arka Garima, VU-18, Selection 2-1, Section 263, Pusa Komal and Kanakamoni were good general combiners for most of the yield components. The hybrids VU-18 x Arka Garima and Selection 2-1 x VS 389 possessed high specific combining ability effects for yield per plant.
Effect of growth regulators on the growth, yield and quality of sweet potato (Ipomoea batatas (L.) Lam)
(Department of Horticulture, College of Agriculture, Vellayani, 1980) Abdul Vahab, M; Mohanakumaran, M
An experiment was conducted with three concentrations of Ethrel (150, 300 and 450 ppm) and three concentrations of CCC (250, 500 and 1000 ppm) to study the effect of the two growth, yield and quality of a sweet potato variety Bhalrakalichola. Three foliar sprayings were given at an interval of 15 days starting from the 30th day after planting. Ethrel as well as CCC showed similarity in influencing the length of vine, number of branches, length of internode, girth of internode and leaf area. While the length of vine , length of internode and individual leaf area were significantly decreased the number of branches and girth of internode were significantly increased by the application of the growth regulators, Ethrel significantly reduced the fresh weight of top and the number of leaves. The weight of tops was not significantly affected by CCC.
Entry, movement and infection of 32p labelled ralstonia solanacearvm (smith) yabuuchietal. in chilli (capsicum annuum l.)
(Kerala Agricultural University, Vellanikara, 2001) Baby Lissy, Markose; Abdul Vahab, M; Peter, K V; Kamalam, N V; James, Mathew
Autoradiography and radioassay techniques were utilized to study entry, movement, growth and multiplication, colonisation and infection of Ralstonia solanacearum in chilli. Radioassay of the inoculated resistant and susceptible varieties of chilli revealed that radioactivity counts were more in susceptible variety than in the resistant variety labelled with 32P at 1 h as well as 24 h of inoculation. This radiotracer technique using 32P labelled bacteria in chilli is a potential tool in such plant pathological studies.
Evaluation of F1 hybrids resistant to bacterial wilt and inheritance of resistance in brinjal (Solanum melongena L.)
(Department of Olericulture, College of horticulture, Vellanikkara, 1991) Geetha Varghese; Abdul Vahab, M
The present studies "Evaluation of F hybrids resistant to bacterial wilt and inheritance of resistance in brinjal (Solanum melongena L.) were conducted during February 1990 to July 1991 in the vegetable research plots of Kerala Agricultural University, Vellanikkara. Evaluation of F1 hybrids over 4 environments revealed that all the 3 hybrids were superior to their parents for yield during all the four seasons. It also indicated significant role of genotype x environment interaction in the yielding ability of the hybrids. Considering wilt resistance the hybrids were not superior to their parents. Varietal difference was observed for plant height, fruits/ plant, fruit weight, fruiting period and productive flowers. Estimation of heterosis of three F1s over their parents revealed significant heterosis for plant height, days to flower, days to first fruitset, days to harvest, primary branches/plant, total fruits/plant, total yield/plant, average fruit weight and fruiting period. All the three hybrids viz. Surya x Pant Rituraj, SM 6-6 x SM 132, SM 6-2 x Pusa Purple Cluster were stable. Study on the nature of inheritance showed that resistance to bacterial wilt is inherited in a recessive and monogenic manner.
Evaluation of F1, hybrids resistant to bacterial wilt and inheritance of resistance in brinjal ( Solanum melongena L. )
(Department of Olericulture, College of Horticulture, Vellanikkara, 1991) Geetha Varghese; Abdul Vahab, M
The present studies "Evaluation of F hybrids resistant to bacterial wilt and inheritance of resistance in brinjal ( Solanum melongena L . ) were conducted during February 1990 to July 1991 in the vegetable research plots of Kerala Agricultural University, Vellanikkara. Evaluation of F hybrids over 4 environments revealed that all the 3 hybrids were superior to their parents for yield during all the four seasons. It also indicated significant role of genotype x environment interaction in the yielding ability of the hybrids. Considering wilt resistance the hybrids were not superior to their parents. Varietal difference was observed for plant height, fruits/ plant, fruit weight, fruiting period and productive flowers. Estimation of heterosis of three F1s over their parents revealed significant heterosis for plant height, days to flower, days to first fruit set, days to harvest, primary branches/plant, total fruits/plant, total yield/plant, average fruit weight and fruiting period. All the three hybrids viz. Surya x Pant Rituraj, SM 6-6 x SM 132, SM 6-2 x Pusa Purple Cluster were stable. Study on the nature of inheritance showed that resistance to bacterial wilt is inherited in a recessive and monogenic manner.
Evaluation of selected varieties of okra for yield and resistance to yellow vein mosaic
(Kerala Agricultural University, 1993) Sally K Mathew; Abdul Vahab, M; Devadas, V S; Anitha Cherian
Seven selected varieties of okra were evaluated foryield and YVMV disease resistance under field conditions for three years at the Department of Olericulture, College of Horticulture, Vellanikkara, Trichur. Considering yield and disease resistance, the performances of the varieties Selection-4 and Arka Anamika were promising.
Genetic and biochemical bases of resistance to bacterial wilt in chilli
(Department Of Olericulture, College Of Horticulture, Vellanikkara, 1996) Baby Lissy Markose; Abdul Vahab, M
Investigation on “Genetic and biochemical bases of resistance to bacterial wilt in chilli’ was carried out in the Department of Olericulture, College of Horticulture, Vellanikkara during 1992-96 to study the inheritance and mechanisms of bacterial wilt resistance and to develop a near isogenic line of Pusa Jwala with resistance to bacterial wilt. Pseudomonas solanacearum, the bacterial wilt pathogen was isolated from infected chilli plants and its pathogenicity was established. The resistance to this disease showed a monogenic and incompletely dominant type of inheritance. Studies on biochemical basis of resistance revealed that total phenol, OD phenol and protein content and enzyme activities had a positive association with bacterial wilt resistance. Ujwala, the resistant variety showed high protein content and had higher activities of peroxidase and polyphenol oxidase enzyme in all plant parts. Higher total phenol was found only in roots and OD phenol in roots and stems of Ujwala. All these biochemical constituents recorded an increasing trend on inoculation in both resistant and subsceptible varieties. The wilt resistant variety had higher OD phenol and protein contents on inoculation whereas the susceptible variety was higher in total phenol content. Both peroxidase and polyphenol oxidase activity were higher in resistant than in susceptible variety. The higher amount of OD phenol and their oxidation products like quinones formed by increased peroxidase and polyphenol oxidase were ascribed for resistance in Ujwala. In the protein gel electrophoresis, the resistant and susceptible genotypes possessed similar bands with identical electrophoretic mobility. The isozyme patterns of peroxidase and esterase were studied. Roots for peroxidase and leaves for esterase showed clear bands. The resistant and susceptible varieties were different in banding pattern before inoculation. Inoculation did not evince any change in the banding pattern for peroxidase and esterase enzymes. The resistant variety had a well developed secondary xylem with thick and compact piliferous layers and cortical cells compared to the susceptible variety. In the radiotracer studies, radioactivity counts were more in susceptible than in resistant variety after inoculation in both 32p and 35S labeled plants. In the autoradiography, the 35S labeled bacteria were more in susceptible plants than in resistant ones. However there was no appreciable difference between resistant and susceptible plants when 32P tagged bacteria were inoculated. A near isogenic line of Pusa Jwala, moderately resistant to bacterial wilt, was developed by crossing Ujwala with Pusa Jwala and advancing the F1s to BC2F4 generation.
Genetic variability and heterosis in cucumber (Cucumis Sativus L.)
(Department of Horticulture, College of Agriculture, Vellayani, 1997) Gayathri, K; Abdul Vahab, M
The present investigation on (Genetic variability and heterosis in cucumber (Cucumis sativus L.)' was conducted at the College of Agriculture, Vellayani, Trivandrum during 1995-97. Twenty two genotypes of cucumber collected from different parts of the country were grown in randomised block design with two replications and assessed the genetic variability of fifteen characters. The genetic parameters like variability, heritability, genetic advance, correlation coefficients and direct and indirect effects of the component traits on yield were estimated. Seven parents were selected based on selection index, crossed in all possible combinations without reciprocals in a 7x7 diallel and produced 21 Fl hybrids. These F1 hybrids were evaluated along with their parents and derived information on general and specific combining ability and heterosis. Significant differences were observed among the 22 genotypes for all the fifteen characters studied. Yield/plant, fruits/plant, average fruit weight and node to first female flower had the highest genotypic coefficient of variation with high heritability and genetic advance. Fruits/plant, average fruit weight, fruit girth and fruit diameter were highly correlated with yield. Fruit girth exerted the maximum positive effect on yield followed by average fruit weight and fruits/plant. Significant gca and sca variances were observed for all the traits. CS 12 and CS 9 were good general combiners for yield. The hybrids CS 12 x Punerikhira, CS 9 x ARC-1 and BSS 169 x ARC-1 possessed high sca effects for yield. Significant heterosis were observed for most of the traits. Relative heterosis, heterobeltiosis and standard heterosis were significant for days to first female flower opening. Punerikhira x ARC-1 and CS 9 x Punerikhira were significantly earlier than the standard variety CS 12. Relative heterosis and heterobeltiosis were observed for yield/plant. None of the hybrids exceeded the standard parent. The hybrids BSS 169 x ARC-1, CS 9 x ARC-l and Punerikhira x ARC-1 showed significant relative heterosis and heterobeltiosis for yield/plant.
Heterosis in bacterial wilt resistant hybrids of brinjal (Solanum melongena L.)
(Kerala Agricultural University, 1994) Geetha Varghese; Abdul Vahab, M
Studies on heterosis in three wilt resistant F, hybrids and their six parents for four seasons revealed that two hybrids viz., SM 6-2 x Pusa Purple Cluster and SM 6-6 x SM 132 exhibited significant relative heterosis, heterobeltiosis and standard heterosis for fruit number and yield per plant in most of the seasons.
Homeostatic analysis of components of genetic variance and inheritance of fruit colour, fruit shape and bitterness in bitter gourd (Momordica charantia L.)
(Department of Olericulture, College of Horticulture, Vellanikkara, 1989) Abdul Vahab, M; Gopalakrishnan, P K
Identification of non bolting genotypes and planting time in Amaranthus (Amaranthus tricolor L.)
(Department of olericulture, College of agriculture, Vellayani, 2014) Jacob Shemon; Abdul Vahab, M
The present investigation on “Identification of non- bolting genotypes and planting time in amaranthus (Amaranthus tricolor L.)” was conducted at Department of Olericulture, College of Agriculture, Vellayani during 2013-14. The objectives were to find out non- bolting genotype(s) of amaranthus with increased yield and acceptable quality and to arrive at best planting time in amaranthus for maximum green yield. Six separate experiments were laid out in randomized block design with 3 replications. Eleven genotypes were planted at bimonthly intervals starting from 1st March 2013 to January 2014. Analysis of variances revealed significant difference among genotypes, planting dates and their interactions for all the characters studied. Among the genotypes, Amt 1 was the highest yielder (439.67 g/plant) followed by Amt 8 (320.88g/plant) and Amt 11 (313.05 g/plant). Maximum delay in fifty per cent flowering was in Amt 1 (113.28 days) followed by Amt 8 (72.44 days) and Amt 11 (62.89 days) whereas, earliest flowering was observed in Amt 2 (20.22 days). The lowest incidence of leaf blight was observed in Amt 11 (2.28) followed by Amt 4 (2.57) and leaf webber incidence was lowest for Amt 1 (1.04) followed by Amt 10 (1.05). Among the planting dates, March planting recorded highest yield and yield attributes. It resulted in highest yield per plant (346.77 g) followed by September planting (231.49 g). The tallest plants were observed in September planting (57.52 cm) and maximum branches per plant in January planting (11.37). Fifty per cent flowering was latest in March planting (58.49 days) whereas it was earliest in November flowering (41.91 days). Lowest intensity of leaf blight was observed in March planting whereas leaf webber incidence was lowest in September planting. The interaction effects between sowing dates and genotypes were significant for all the characters. Maximum yield per plant was in Amt 1 (784.56 g/plant) planted on March 1st followed by Amt 8 (588.83 g/plant) and Amt 11(493.98 g/plant) planted in the same month. Best leaf/stem ratio was observed in Amt 1 (2.61) in January 1st planting followed by Amt 3 (2.57) in March planting. Amt 1 in March planting (146.67 days) was latest in fifty per cent flowering followed by Amt 1 in July planting (139.67 days), whereas earliest days to flowering was in Amt 2 in July planting (17.33 days) followed by Amt 2 (18 days) in September planting. The genotypes did not differ significantly for quality characters. Variability among genotypes for all characters was studied using phenotypic and genotypic coefficient of variation, heritability and genetic advance. Correlation revealed high significant positive correlation to leaf length, leaf width, days to 50 per cent flowering, days to seed maturity, leaf weight, stem weight and leaf / stem ratio with yield per plant. The study identified Amt 1 as the best genotype followed by Amt 8 and Amt 11 with respect to superiority in yield and late bolting nature and March as the best planting time followed by September. Considering season and varieties, the performance was best for the genotype Amt 1 when planted during March.
Molecular characterization of ivygrourd [Coccinia grandis (L.) Voigt]
(Department of Olericulture, College of Agriculture, Vellayani, 2004) Suresh, S; Abdul Vahab, M
Morpho-molecular characterization of cluster bean(Cyamopsis tetragonoloba(L.) Taub.).
(Department of Olericulture, College of Agriculture, Vellayani, 2011) Divya K Lekshmanan; Abdul Vahab, M
Oleoresin recovery, quality characterization and storage stability in chilly (Capsicum spp.) genotypes
(Department Of Olericulture, College Of Horticulture, Vellanikkara, 1997) Mini, C; Abdul Vahab, M
An investigation on “oleoresin recovery, quality characterisation and storage stability in chilli (Capsicum spp.) genotypes” was undertaken in the department of Olericulture, College of Horticulture, Vellanikkara during 1993 – 96 with the objective of standardising the solvent for chilli oleoresin extraction, identifying capsicum species or cultivars for maximum oleoresin yield with respect to season and stage of harvest and understanding the quality parameters of oleoresin as affected by storage. Among the six solvents tried viz. acetone, ethyl alcohol, dichloro ethane, hexane, benzene and ethyl acetate, ethyl acetate was standardised as the best solvent in respect of time and efficiency of extraction. Evaluation of nine genotypes for oleoresin under three different seasons at three stages of harvest maturity identified Arka Lohit as the highest yielder of oleoresin. Genotypes were higher in oleoresin content winter. Considering the fruit yield and oleoresin recovery together, summer was the best season for total oleoresin yield. The genotypes were on par in oleoresin yield in summer and winter when fruits were harvested at full ripe or withering stage. During rainy season, oleoresin content was maximum at withering stage. The colour and pungency increased with fruit maturity. The capsaicin content of the genotypes varied from 1.1 % to 2.2 % indicating its suitability for oleoresin required for pharmaceutical industry. Colour value was highest in the paprika type, KTPL – 19. The storage studies of oleoresin revealed that the type of container did not influence the colour loss. The oleoresin stored in dark was higher in colour value compared to samples kept open. For capsaicin, open condition of storage was better than dark storage. Delaying the harvest to withering stage and storing the oleoresin in polythene containers for eight months under open conditions can be recommended for increased pungency. Storage is not advisible for colour retention.
Response of slicing cucumber (Cucumis sativus L.) to population density, trailing systems and nutrients
(Department of Horticulture, College of Agriculture, Vellayani, 1998) Renji, C R; Abdul Vahab, M
The present investigation on "Response of slicing cucumber (Cucumis sativus L.) to population density, trailing systems and nutrients" was conducted at the Instructional Farm, College of Agriculture, Vellayani, Thiruvananthapuram during April to June, 1998. The cucumber variety 'poinsette' collected from National Seed Corporation, was raised in split plot design with four replications. Four trailing systems, five population density and two levels of nutrients were tried to find out their direct and interaction effects on morphological as well as yield attributes. Majority of the characters were significantly influenced by the direct as well as interaction effects of the trailing systems, population density and nutrient levels. Among the trailing systems, plants trailed on mulches were earlier for male and female flower opening, whereas first harvesting was in pandal grown plants which also had largest values for yield and fruit characters. In general plants grown under wider spacing were earlier in flowering. The range for days to harvest was narrow for the various population densities. Highest density of 13 ,3 3 3 plants / ha gave the highest yield / plot. The nutrient levels significantly influenced majority of the vegetative as well as productive characters. Higher levels of nutrients gave early harvest, increased vegetative growth and higher yield / plot. The interaction between trailing systems and population density revealed that plants trailed on mulches and twigs at lowest density were earlier in female flower opening. Plants trailed on pandals at the moderate levels of density and those trailed on twigs at the fourth level were earlier in first harvesting. Plant grown on pandals at closer spacmg had maximum yield / plot. Trailing systems interacted significantly with nutrient levels. Plants receiving lower nutrient level grown on mulches were earlier m first female flower opening where as harvesting was early in pandal grown plants receiving lower nutrient levels. Yield per plot was maximum in pandal grown plants at highest nutrient level. Plots with a moderate population density with higher nutrient level gave early harvesting. Maximum yield / plot was at closer spacing with higher nutrient level. The three way interaction of trailing systems, population density and nutrient was prominent for most of the characters. Plants trailed on ground with lower nutrient level at the highest population density were the earliest in first female flower opening. However harvesting was first inpandal grown plants at lower nutrient level with moderate population density. Yield per plot and per plant were" maximum in pandal grown plants at the highest level of nutrients and population density. This treatment combination also had the highest benefit: cost ratio 3.50.
Seasonal evaluation of capsicum species and cultivars for oleoresin recovery
(Kerala Agricultural University, 1999) Mini, C; Abdul Vahab, M; Indira, P
Evaluation of nine chilli genotypes for oleoresin recovery under ihree different seasons identified Arka Lohit as the highest yielderofoleuresin. Genotypes were higher in oleoresin content during winter. Considering the fruit yield and oleoresin recovery together, summer was the best season for oleoresin yield.
Seed yield and quality in amaranthus as influenced by planting systems and harvest stages
(Department of Olericulture, College of Agriculture, Vellayani, 2007) Bindu, L S; Abdul Vahab, M
The present investigation on “Seed yield and quality in amaranthus as influenced by planting systems and harvest stages” was conducted at the Department of Olericulture and the Instructional Farm, College of Agriculture, Vellayani, Thiruvananthapuram during February - May, 2006. Five planting systems viz., transplanting 25 days, 20 days, 15 days after sowing, broadcasting and line sowing were tried with four harvest stages which were 30, 40, 50 and 60 days after flowering. Majority of the characters were significantly influenced by the direct as well as interaction effects of the planting systems and harvest stages. Among the planting systems the earliest flowering was shown by seedlings transplanted 20 days after sowing. Transplanting 25 days after sowing produced the tallest plants. Maximum seed yield per plot and per plant was found in plants transplanted 20 days after sowing. Seed quality characters like seed recovery percentage, germination percentage and vigour index was also highest in plants transplanted 20 days after sowing. Among harvest stages maximum seed yield per plot and per plant were shown by plants harvested 50 days after flowering while those harvested 30 days after flowering gave the highest seed recovery percentage. Seeds from plants harvested 40, 50 and 60 days after flowering showed high germination percentages with slight differences between the values.
Standrdisation of population density in watermelon (Citrullus lanatus (Thunb.) Mansf.)
(Department of Horticulture, College of Agriculture, Vellayani, 2000) Bindukala, A R; Abdul Vahab, M