Abstract
To better understand the genetic control of resin yield, growth traits and morphologic traits for Pinus elliottii families, genetic relationships among these traits were examined in three 27-year-old progeny trials located in Jingdezhen, Jian and Ganzhou, Jiangxi Province, China. In total, 3695 trees from 112 families were assessed at the three sites. Significant site, family and family × site effects were found for resin yield, growth traits and morphologic traits. Resin yield and growth traits were found to be under moderate genetic control for the three sites combined, with family heritability and individual narrow-sense heritability ranging from 0.41 to 0.55 and 0.11 to 0.27, respectively. The coefficient of genotypic variation (CVG) of stem volume (SV) and crown surface area (CSA) were higher than those of other traits at each site. Genetic correlation estimates indicated that selection for growth traits might lead to a large increment in resin yield (RY), and most morphologic traits had moderate to strong correlations with growth traits at each individual site. One possible strategy in tree breeding would be to maximize resin production through selection for growth traits.
Highlights
Pine resin is an important non-timber secondary forest product
At the Jingdezhen site, the crown surface area (CSA) was the highest, which was supported by the highest crown width (CW) and moderate crown length (CL) at this site, whereas at the Jian site, the CSA was the lowest
We used 3695 samples from 112 families at three sites for a genetic study in resin yield, growth and morphologic properties of P. elliottii in Jiangxi Province, China to estimate the genetic parameters and correlated response. These results are summarized as: (1) Significant site, family and family × site effects were found for resin yield, growth and morphologic traits
Summary
Pine resin is an important non-timber secondary forest product. It produces turpentine (monoterpenes and sesquiterpenes) and rosin (diterpenes). These compounds are widely used in pharmaceutical, cosmetics, food, chemical and other such industries [1,2,3]. China is the leading producer of resin in the world. During the 1990s, China annually exported a total of 200,000 tons of resin to more than. 40 countries, accounting for about 50% of the resin traded in the world [4]. Of the pine resin resources, Pinus elliottii is one of the main resin tree species in China
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