Evaluation of High Resin Yielders and Check Trees in Chir Pine (Pinus roxburghii Sargent) for Anatomical Characters

Studies were conducted to investigate the high resin yielder and check trees in Chir pine (Pinus roxburghii Sargent) for anatomical parameters. The data on tracheid length, diameter of resin ducts and number of resin ducts per mm² exhibited significant variation in different high resin yielders and check trees in Pinus roxburghii. High resin yielders have shown slightly longer tracheids (5.35 mm) as compared to check trees (4.81 mm). All marked high resin yielders were exhibited maximum diameter of oleoresin ducts (0.20 mm) whereas, check trees recorded minimum (0.15 mm). Maximum number of resin ducts per mm² were found in high resin yielders (0.73) while, minimum number was observed in check trees (0.33). From this study it could be concluded that the tracheid length, diameter of resin ducts and number of resin ducts influences the oleoresin yielding capacity of the tree.