Nature of variability and character associations for cone and seed characteristics in Pinus roxburghii Sargent plus trees.

摘要

Forty nine plus trees form the distributional range of Chir pine falling in different forest divisions of Himachal Pradesh, India were selected for growth form and high resin yield. Data were recorded on cone and seed characteristics and statistically analysed. Genetic coefficient of variation (GCV), phenotypic coefficient of variation (GCV), heritability estimates and genetic advance as percent of mean were found high for cone weight, seeds/cone and 100-seed weight. Seed length, seed thickness, seed width, cone width and cone weight reflected positive direct effect on 100-seed weight whereas, cone length and seed per cone showed negative direct and indirect effect via other traits. The seed length, seed width, seed thickness, cone length, cone width and cone weight which showed direct effect on 100-seed weight.