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Abstract

Pinus roxburghii (F-Pinaceae) is one of the most common chirpine found in the mid-Himalayan region. The crown of this species displays two different needle colour morphotypes (Dark-Green, Light-Green). It is a well known timber and resin yielding tree. Wood exudes oleoresin which yields rosin and turpentine oil having important role in commercial industry. So, the present study was focused on the identification of superior phenotypes possessing higher quality resin yield from two morphotypes of P. roxburghii of Himachal Pradesh. Trees were selected from different areas of Himachal Pradesh with varying latitude and altitude and were tapped for one month. Needle from the same trees were collected, washed and used for section cutting to determine resin ducts. The needle colour, altitude and latitude had significant influence on these parameter.

The effect of stimulants and environmental factors on resin yield of Pinus merkusii tapping

“…Further, the pine trees that grow in stands with high average rainfall, cold temperature, or in stands with a height > 700 m asl produce less resin; whereas higher resin yields are associated with the trees that grow in stands with average rainfall of < 2,000 mm/year, temperatures between 22 to 28 °C, and 400 to 700 m asl (Perhutani 2017). Environmental factors affect the oleoresin yield in several pines (Rodriguez-Garcia et al 2015;Bhardwaj et al 2017;Gajsek et al 2018;Sharma et al 2018). However, the studies with regard to the effect of environmental factors on oleoresin yield of Pinus merkusii remain limited.…”