Studies on genetic variability in open cultivated Hybrid Tea roses (Rosa hybrida L.)
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Date
2018
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Punjab Agricultural University, Ludhiana
Abstract
The present studies entitled, “Studies on genetic variability in open cultivated Hybrid Tea roses (Rosa hybrida L.)” were carried out at the Research Farm, Department of Floriculture and Landscaping, Punjab Agricultural University, Ludhiana during the year 2016-2018. The 20 cultivars of Hybrid Tea had been evaluated to find out the genetic variability among the different vegetative and floral traits in open field condition. The cultivar ‘Taj Mahal’ ‘Snehdare’ and ‘Acapella’ produced large size of flower with good stem length and vase life whereas, the cultivars ‘Netajee’, ‘Ace of Heart’, ‘Modern Art’ and ‘Acapella’ formed less number of thorns making their suitability for cut flower purpose. The highest value of Genotypic Coefficient of Variation (GCV) was obtained for number of flowering stems (52.32 %) followed by thorn density (39.80 %), pollen viability (31.46 %) and number of shoots (28.25 %) whereas, moderate value observed for flower size (10.54 %), days to opening of flower (15.94 %), days to colour development (17.41 %) and days to bud formation (18.14 %). The highest value of Phenotypic Coefficient of Variation (PCV) was obtained for number of flowering stems (57.88 %) followed by thorn density (45.16 %), pollen viability (36.61 %) and number of shoots (34.70%), whereas moderate value of PCV observed for flower size (15.31 %) and days to opening of flower (19.74 %). The estimates of PCV were higher than the corresponding GCV values for all the traits indicated the influence of environment in the expression of these traits. The highest estimate of heritability (h2) was observed for plant height (82.69 %) followed by thorn density (82.67 %), number of flowering stems (81.71 %) and vase life (81.17 %) whereas, the highest genetic advance as per cent of mean was recorded for number of flowering stems (97.37 %) followed by and thorn density (72.05 %). The high estimation of heritability (h2) was coupled with high genetic advance for number of flowering stems and thorn density per 10 cm of stem indicating them as important traits for selection process.
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