~ 2037 ~ International Journal of Chemical Studies 2020; 8(1): 2037-2039 P-ISSN: 2349–8528 E-ISSN: 2321–4902 IJCS 2020; 8(1): 2037-2039 © 2020 IJCS Received: 28-11-2019 Accepted: 30-12-2019 Bhupender Dutt Department of Forest Products, College of Forestry, Dr. YS Parmar University of Horticulture and Forestry, Himachal Pradesh, India Rajneesh Kumar Department of Forest Products, College of Forestry, Dr. YS Parmar University of Horticulture and Forestry, Himachal Pradesh, India Heena Department of Forest Products, College of Forestry, Dr. YS Parmar University of Horticulture and Forestry, Himachal Pradesh, India Vipasha Department of Forest Products, College of Forestry, Dr. YS Parmar University of Horticulture and Forestry, Himachal Pradesh, India Corresponding Author: Vipasha Department of Forest Products, College of Forestry, Dr. YS Parmar University of Horticulture and Forestry, Himachal Pradesh, India Assessing the potential half-sib progenies of Pinus roxburghii Sargent for oleoresin yield Bhupender Dutt, Rajneesh Kumar, Heena and Vipasha DOI: https://doi.org/10.22271/chemi.2020.v8.i1ad.8567 Abstract Pinus roxburghii (Chir Pine) belonging to family Pinaceae, is native to the tropical forests of Himachal Pradesh which is being commercially tapped for oleoresin in India. Resin industry, which use oleoresin as a raw material is one of the foremost industry thriving on this product and has got an ever increasing importance in our national economy. Keeping in view the value and importance of oleoresin, progeny trial was conducted to evaluate the oleoresin yielding potential of half-sib progenies of Chir Pine. Experiment was laid out in the main campus area of Dr Y.S. Parmar University of Horticulture and Forestry, Nauni, Solan (HP) and data was collected on oleoresin yield at the end of season. The trees of progenies having more than 30 cm dbh were segregated for oleoresin tapping experiment. In total, 22 out of 60 progenies had minimum one tree above 30 cm dbh in at least two replications. Hence, these progenies were selected for oleoresin tapping. The method employed for oleoresin collection was borehole method. The data pertaining to the oleoresin yield from different selected progenies revealed significant differences. The maximum oleoresin yield (625.00g/season) was noticed in Kaldoo- P3 and minimum in Rakni-P8 (130.00 g/season). Keywords: Pinus roxburghii, progenies and oleoresin yield Introduction Pinus is one of the most widely distributed tree-genera extending from polar region to the tropics in the Northern hemisphere. In India, four Pine species (Family-Pinaceae) viz., Pinus roxburghii, Pinus wallichiana, Pinus gerardiana and Pinus kesiya are distributed in Himalayas and in the hills of Assam. Amongst all, Pinus roxburghii (Chir Pine) is recognized for high oleoresin productivity and moderate wood quality. It is also one of the most important economical and ecological pine species in sub tropical area of Himachal Pradesh. Resin is an important produce of pine forests in the world. Being an important forest by- product, the crude oleoresin exudates is converted by steam distillation into its primary fractions of rosin (diterpenes) and turpentine (mono and sesquiterpenes), which in turn are processed into chemical products such adhesives, coatings, paper sizing, cleaners, food gums, pharmaceuticals, solvents, cleaning agents for paints and varnishes, production of flavor and fragrances in food industries, perfume, disinfectants, synthetic rubber, coatings and in production of printing inks and water-resistant/water proofing materials (Stubbs et al., 1984; FAO, 1995; Lee et al., 2001; Kelkar et al., 2006; Rodrigues et al., 2008; Odaba Ģ-Serin et al., 2014) [1, 2, 3, 4, 5, 6] . Besides these, other uses include, manufacture of linoleum, explosives, insecticides and disinfectants (Singh and Mehra, 1982; Nimkar and Sharma, 2008) [7, 8] . In addition to this, oleoresin production offers promising revenue generation and employment opportunities to the families residing in the forest vicinity. India is the second largest resin producer in Asia after China. Earlier, India used to export resin, but now consumes all its production internally through its small and large scale industries. With the increase in day by day demand of oleoresin, the dependency on the clones has increased significantly because the oleoresin production from natural stands is insufficient to meet the basic requirement of the resin based industries. To minimize the gap between the demand and supply it has now become necessary to identify pre-potent progenies through breeding programmes such as half- sib progeny evaluation.