Genetic variability and correlations in nine divergent varieties of coconut
| dc.contributor.advisor | Ibrahim, K K | |
| dc.contributor.author | Sindhumole, P | |
| dc.contributor.author | KAU | |
| dc.date.accessioned | 2019-05-02T06:18:08Z | |
| dc.date.available | 2019-05-02T06:18:08Z | |
| dc.date.issued | 1998 | |
| dc.description | PG | en_US |
| dc.description.abstract | An 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. | en_US |
| dc.identifier.citation | 171392 | en_US |
| dc.identifier.uri | http://krishikosh.egranth.ac.in/handle/1/5810101581 | |
| dc.keywords | Plant breeding and genetics, coconut-genetic variability, coconut-seasonal effect, coconut | en_US |
| dc.language.iso | en | en_US |
| dc.publisher | Department of Plant Breeding and Genetics, College of Horticulture, Vellanikkara | en_US |
| dc.sub | Genetics and Plant Breeding | en_US |
| dc.subject | null | en_US |
| dc.theme | Genetic variability and correlation study of coconut | en_US |
| dc.these.type | M.Sc | en_US |
| dc.title | Genetic variability and correlations in nine divergent varieties of coconut | en_US |
| dc.type | Thesis | en_US |