Studies on variability for various quantitative traits in rose (Rosa spp.)

The present investigation was conducted at Model Floriculture Centre, Govind Ballabh Pant University of Agriculture and Technology, Pantnagar, during 2004–2005 and 2005–2006. The experimental material comprised of 21 Hybrid Tea rose varieties. Under pooled year data study, all the characters under study revealed higher value of genotypic coefficient of variation compared to environment coefficient of variation but lower to phenotypic coefficient of variation indicating the influence of environmental factors. Higher degree of genotypic and phenotypic coefficient of variation was obtained for thorn density followed by length of shoot after one month of bud sprouting, number of flowers per plant, length of sprouted bud, plant spread and length of shoot after 15 days of bud sprouting. Moderate value of GCV and PCV were recorded for days taken to bud sprouting, number of flowers at first flower flush, number of petals per flower, days taken to anthesis, total shelf life and plant spread. Highest degree of environmental coefficient of variation was observed for length of flower bud followed by number of flowers at first flush. Highest heritability, genetic advance and genetic advance as per cent mean were observed for thorn density.