Hazarika, B.N.Dubey, R KSingh, Shiv MangalSingh, Vikas2018-07-102018-07-102011-08-08http://krishikosh.egranth.ac.in/handle/1/5810058701investigation was conducted during rabi 2010 at Vegetable Research Farm, College of Horticulture and Forestry, Central Agricultural University, Pasighat, Arunachal Pradesh in 20 diverse genotypes of potato. The experiment was laid out in Randomized Block Design with three replications. Genetic variability was studied for characters viz; days to 50% emergence, plant height, number of compound leaves per shoot, leaf area, shoot girth, number of shoot per plant, length of stolon, length of tuber, diameter of tuber, weight of tuber, number of tubers per plant, volume of tuber, specific gravity of tuber, reducing sugar content, dry matter content of tuber and tuber yield per plant. Data were analysed statistically for genotypic and phenotypic variance, coefficient of variation heritability, genetic advance as percent of mean, correlation coefficients and path coefficient.Name: Shiv Mangal Singh Registration No. 03(H) M-2009 Sem. And year of Degree: M.Sc. (Horticulture) Admission; 1st, 2009-10 Major: Vegetable Science Chair person: Dr. R. K. Dubey Thesis title: Studies on variability components and genetic parameters in Potato (S. Tuberosum L.) under foot hills of Arunachal Pradesh ABSTRACT The present investigation was conducted during rabi 2010 at Vegetable Research Farm, College of Horticulture and Forestry, Central Agricultural University, Pasighat, Arunachal Pradesh in 20 diverse genotypes of potato. The experiment was laid out in Randomized Block Design with three replications. Genetic variability was studied for characters viz; days to 50% emergence, plant height, number of compound leaves per shoot, leaf area, shoot girth, number of shoot per plant, length of stolon, length of tuber, diameter of tuber, weight of tuber, number of tubers per plant, volume of tuber, specific gravity of tuber, reducing sugar content, dry matter content of tuber and tuber yield per plant. Data were analysed statistically for genotypic and phenotypic variance, coefficient of variation heritability, genetic advance as percent of mean, correlation coefficients and path coefficient. Analysis of variance revealed significant differences among the genotypes for all the characters. The genotypes viz; J/96-238, J/99-48, J/99-227 and Kufri Pukhraj were promising as they have more than one desirable trait. High phenotypic and genotypic coefficients of variation (PCV and GCV), heriatability and genetic advance as percent of mean were observed for reducing sugar content, weight of tuber, diameter of tuber, volume of tuber and specific gravity of tuber, moderate to high phenotypic and genotypic coefficient of variation (PCV and GCV), heritability and genetic advance as percent of mean were observed for tuber yield per plant and length of tuber. Correlation studied indicated that tuber yield per plant was positively and significantly correlated with days to 50% emergence, plant height, length of tuber, weight of tuber, number of tuber per plant and reducing sugar content but negative and significant association was established with specific gravity and dry matter content of tuber. Maximum positive direct effect on tuber yield per plant was imposed by length of tuber,weight of tuber, length of stolon and shoot girth. However, high negative direct effect was observed for diameter of tuber, plant height, volume of tuber, number of compo9und leaves per shoot and dry matter content.ennullThesis