title: Variability studies for needle and wood traits of different half sib progenies of Pinus roxburghii Sargent.
abstract: Genetic variability studies for needle and wood traits were carried out for the different half sib progenies of Chir pine, raised in 1985 at the main campus of University. There existed a significant variation for these traits among the different half sib progenies, viz., needle length (18.1-24.6 cm), needle thickness (0.53-0.71 mm), number of stomata per mm of a row (7.3-12.0), specific gravity of wood (0.36-0.46), tracheid length (1.51-1.85) and moisture content of wood (47.76-58.81). This variability was found under genetic control, as all these progenies are growing under same environment, and are of same age. Traits having high heritability and genetic gain like, needle thickness, wood specific gravity, tracheid length and others, indicate high genetic control. This variability can be exploited in tree improvement programs through selection and breeding approaches for development of advanced generations. Correlation studies for different traits at genotypic and phenotypic levels provided the basic knowledge of association to chalk out efficient breeding strategy for higher productivity through indirect selection.
authors.affiliation: Department of Tree Improvement and Genetic Resources, Dr. Y. S. P. University of Horticulture and Forestry, Nauni, Solan, 173230 HP India ; Indian Institute of Natural Resins and Gums, Namkum, Ranchi, 834010 India.
authors.forename: Sheeraz Saleem
authors.identifier: 0000-0003-3836-8479
authors.initials: SS
authors.lastname: Bhat
authors.affiliation: Dr. Y. S. P. University of Horticulture and Forestry, Nauni, Solan, 173230 HP India.
authors.forename: N B
authors.initials: NB
authors.lastname: Singh
authors.affiliation: Department of Tree Improvement and Genetic Resources, Dr. Y. S. P. University of Horticulture and Forestry, Nauni, Solan, 173230 HP India.
authors.forename: H P
authors.initials: HP
authors.lastname: Sankhyan
authors.affiliation: Network Project on HPVA of Natural Resins and Gums, Dr. Y. S. P. University of Horticulture and Forestry, Nauni, Solan, 173230 HP India.
authors.forename: K R
authors.initials: KR
authors.lastname: Sharma
keywords: Heritability; Needle; Pinus roxburghii; Principal component analysis; Tracheid length