Browsing by Author "Ibrahim, K K"
Now showing 1 - 17 of 17
Results Per Page
Sort Options
ArticleItem Open Access Antholysis in pepper (Piper Nigrum L.)(Kerala Agricultural University, 1987) Sukumara Pillai, V; Sasikumaran, S; Ibrahim, K K; Unnikrishnan Nair, P K; KAUArticleItem Open Access Comparative genetic variability within the open-pollinated seedlings of certain varieties of black pepper (Piper nigrum L.)(Kerala Agricultural University, 1986) Ibrahim, K K; Sukumara Pillai, V; Sasikumaran, S; KAUArticleItem Open Access Correlated responses in yield and certain component characters in pepper (Piper nigrum L.)(Kerala Agricultural University, 1987) Ibrahim, K K; Sukumara Pillai, V; Sasikumaran, S; KAUArticleItem Open Access Expression and association of spike characters in black pepper(Kerala Agricultural University, 1988) Ibrahim, K K; Sukumara Pillai, V; Sasikumaran, SThesisItem Open Access Gametocidal properties of certain chemical in rice(Department of Plant Breeding and Genetics, College of Horticulture, Vellanikkara, 1996) Manjula, M; KAU; Ibrahim, K KA pot culture experiment was conducted at Instructional Farm, College of Horticulture, Vellanikkara, Kerala during summer 1995 to study the gametocidal properties of three chemicals viz., ethrel, maleic hydrazide and streptomycin in two varities of rice. The study aimed at induction of variable levles of male sterility using these chemicals, with minimum interactions with other factors viz., stage, concentration and variety and also without adversely affecting spikelet fertility and plant growth characters like panicle exsertion. The chemicals were sprayed at concentrations of 4000, 6000 and 8000 ppm at stage-1 (spiketet differentiation stage) or stage-2 (pollen mother cell formation stage) in Annapurna, a short duration variety and Athira, a medium duration variety. The pollen spikelet sterility were observed in main and subsequent panicles. Pollen sterility differed with chemical, concentration and variety in main panicle and with all factors including stage of application in subsequent panicles. The effect of a chemical interacted significantly for pollen sterility with other factors viz., concentration and variety in main panicle and concentration and stage in subsequent panicles. The treatments involving maleic hydrazide were the most effective inducing pollen sterility upto 99.3 per cent. Ethrel was moderately effective in inducing maximum pollen sterility of 48.9 per cent in Annapurna with 4000 ppm at stage-1. Streptomycin failed to induce pollen sterility irrespective of stages and concentrations. Maleic hydrazide produced male sterility in a dose dependent manner. It caused more sterility in main panicle in Annapurna but in susequent panicles in Athira. Pollen sterility to a large extent was due to deformed anthers containing low or no pollen production in MH treated plants. High pollen sterility induced by the chemical was aasociated with high sterility of spikelets (upto 99.7%). Besides, it adversely affected plant height, panicle emergence and panicle exsertion. MH at 4000 ppm appeared to be the most ideal treatment for population improvement programme considering its effects on not only pollen sterility but also other important characters including spikelet sterility. On the other hand, in hybrid rice programme that require almost complete male sterility, MH at 8000 ppm at stage-1 or at 6000 ppm at stage-2 appeared to be more suitable.ThesisItem Open Access Genetic variability and correlations in nine divergent varieties of coconut(Department of Plant Breeding and Genetics, College of Horticulture, Vellanikkara, 1998) Sindhumole, P; KAU; Ibrahim, K KAn experiment was conducted at Instructional Farm, College of Horticulture, Vellanikkara during 1995-96 on nine coconut varieties viz., West Coast Tall x Choughat Yellow Dwarf, West Coast Tall x Gangabondam, Laccadive Ordinary x Gangabondam.West Coast Tall, Philippines, Jawa, Cochin China, New Guinea and Laccadive Ordinary, Significant varietal variance was absent among several characters, Economic characters showed the highest genotypic coefficient of variation (16 to 22%). Among the vegetative and reproductive characters, heritability was maximum for petiole length (52%) followed by the economic characters percent oil content and nut yield (45% each). Among the four reproductive characters studied for seasonal variability viz" spadix length (SL), branches spadix' (BS), female flowers spadix" (FF) and fruit set (FS), FF showed the maximum variation, FF andFS had been low during the rainy months, SL was markedly reduced during the winter months, Phenotypic correlation coefficients were generally lower than genetic SInce environmental correlation was either less in magnitude or in opposite direction in relation to the genetic, Genotypic correlations were mostly negative where vegetative characters were involved and positive for other pairs, Only nut yield among the four economic characters was correlated with both vegetative and reproductive characters, Other economic characters were dependent only on vegetative characters. Similarly step-down regression revealed that only vegetative characters were retained in the final model for all the economic characters except nut yield. Vegetative characters also showed higher direct effects than reproductive characters on the variability of economic characters. Trunk height generally produced highest direct effects on the economic characters, but was modified by the indirect effects to large extent except in the case of oil content (%). Correlation, regression and path analyses suggested that reproductive characters had less effect on economic characters when all the characters were recorded during the 'same year. This may possibly be due to genotype x season (year) interaction for the reproductive characters.ArticleItem Open Access Genetic variability in nine cultivars of coconut (Cocos nucifera L.)(Kerala Agricultural University, 2000) Sindhumole, P; Ibrahim, K K; KAUAn experiment conducted at the Instructional Farm, College of Horticulture, Vellanikkara, Thrissur on nine coconut cultivars during 1995-96 in RED with three replications and three palms per plot revealed the absence of significant variation among most of the characters. Economic characters showed higher genotypic coefficients of variation (16 to 22 %) compared to vegetative and reproductive characters. Among all the characters, hcritability was maximum for petiole length (52 %) followed by the economic characters, per cent oil content and nut yield (45% each).ThesisItem Open Access Genotype environment interaction in selected hybrid lines of sweet potato (Ipomoea batatas (L.) Lam.)(Department of Agricultural Botany, College of Agriculture, Vellayani, 1980) Ibrahim, K K; KAU; Mary, K GeorgeArticleItem Open Access Genotype X season interaction and stability parameters in black pepper (Piper nigrum L.)(Kerala Agricultural University, 1985) Ibrahim, K K; Sukumara Pillai, V; Sasikumaran, S; KAUGenotype x season interaction and stability parameters for five varieties of pepper for yield was studied at the Pepper Research Station, Panniyur, Jjy utilizing the data recorded over five seasons from 1979-80 to 1983-84. The genotype x season interaction was observed to be significant and a larger portion of it was through the non-linear component. The stability model proposed by Eberhart and Russell (1966) was resorted to in describing the stability parameters of varieties. In this study, the variety Kuthiravaly, was found to be the most stable variety. Panniyur 1 is a high yielding variety especially suited to favourable environments, but can also be considered as more stable variety than Arakkulam Munda, Kalluvally and Balankotta.ArticleItem Open Access Genotypic and phenotypic correlations among yield and its components in black pepper (Piper nigrum L.)(Kerala Agricultural University, 1985) Ibrahim, K K; Sukumara Pillai, V; Sasikumaran, S; KAUData on 28 genotypes of pepper recorded for three seasons, at the Pepper Research Station, Panniyur was utilized to estimate genotypic and phenotypic correfation coefficients in certain quantitative characters in pepper, in general, the characters showed higher genotypic correlation as compared to phenotypic correlation. All the component characters except berry weight were found to be significantly and positively correlated with the yield. On the other hand, berry weight had significant negative association with the yield and other components except spike length. Such relationship observed between pairs of characters will be helpful in planning breeding programmes in this crop.ArticleItem Open Access Heterosis in panniyur 1 black pepper (Piper nigrum L.)(Kerala Agricultural University, 1987) Sukumara Pillai, V; Ibrahim, K K; Sasikumaran, S; KAUArticleItem Open Access N,P and K requirement of black pepper(Kerala Agricultural University, 1987) Sukumara Pillai, V; Sasikumaran, S; Ibrahim, K K; KAUAn experiment, to identify the optimum levels of N, P and K for black pepper was conducted at the Pepper Research Station, Panniyur, Kerala in 33 factorial design completely confounding NPaK2. Analysis of the data collected for eight seasons showed that the economically optimum level of nutrients was 50, 100 and 150g of N, P205 and K20 respectively per vine per annum.ArticleItem Open Access Potential of the black pepper cultivar uthirenkotta in the hybridization programme(Kerala Agricultural University, 1988) Ibrahim, K K; Sukumara Pillai, V; Sasikumaran, S; KAUArticleItem Open Access Prediction of rainfall at Taliparamba by statistical methods(Kerala Agricultural University, 1986) Ibrahim, K K; Unnikrishnan Nair, P K; Mathew Kurian; KAUArticleItem Open Access Seed germination studies in panniyur-1 black pepper(Kerala Agricultural University, 1993) Ibrahim, K K; Sukumara Pillai, V; Sasikumaran, S; KAUThesisItem Open Access Variability in morphological, physiological and biochemical characters in kalmegh (Andrographis paniculata Nees.)(Department of Plant Breeding and Genetics, College of Horticulture, Vellanikkara, 2000) Laju Paul, K; KAU; Ibrahim, K KAn experiment ID kalmegh (Andrographis panicu/ata Nees.) was conducted in the Department of Plant Breeding and Genetics, College of Horticulture, Vellanikkara during 1998-2000, with the objectives of understanding the morphological variability, growth pattern, optimum stage of harvest and the variation in different biochemical compounds among the accessions. The accessions were collected from Kerala and neighbouring states. Ten accessions were compared based on 50 morphological, 16 physiological and 3 biochemical characters. In general, accessions showed uniform root, inflorescence, flower and fruit characters. However a limited variation for habit, stem and leaf characters existed among most of the accessions. In general, accessions showed variability for characters namely total plant dry weight, stem dry weight, leaf dry weight and root dry weight when observed at 1, 2, 3 and 4 months after transplanting. Ranking of the accessions was not consistent on the various dates of harvest. Optimum stage of harvest is recommended as 3 months after transplanting. At this stage maximum herbage yield was recorded by accession Ac-4. Physiological parameters namely Leaf area and LAI showed steady increase up to three months after transplanting and thereafter it declined. LAR, RGR, CGR and NAR recorded higher values at earlier dates. Heritability (broad sense) of characters showed inconsistency at various dates of harvest. However leaf dry weight showed higher heritability on all dates. At 3 months after transplanting i.e. the optimum stage of harvest, heritability was high for all the characters relating to herbage yield and most of the physiological parameters. Biochemical studies revealed that the total phenol content and andrographolide content varied considerably among the accessions. Phenol content in the plant increased with an increase in dry weight while Andrographolide content increased with a proportionate increase in moisture content.ArticleItem Open Access Variability, heritability and genetic advance for certain quantitative characters in black pepper(Kerala Agricultural University, 1985) Ibrahim, K K; Sukumara Pillai, V; Sasikumaran, S; KAUData on 28 genotypes of pepper recorded for three seasons, at the Pepper Research Station, Panniyur was utilized to estimate genotypic and phenotypic variability, heritability and genetic advance in certain quantitative characters of pepper. Spike yield and spike number have shown maximum genotypic and phenotypic variability, but lowest values for heritability. Berry weight has shown highest value for heritability and minimum genotypic and phenotypic variability. The character, spike yield was found to produce highest advance in the expression on selection, whereas only a marginal improvement need be expected for berry weight.