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- W2093816386 abstract "Patterns of genetic variation for adaptive and quantitative attributes in mountain hemlock (Tsuga mertensiana (Bong.)) seedlings from British Columbia were examined at the population (provenance) and family levels. The population and family levels were represented by 12 provenances and 10 families from a single location, respectively. The adaptive attributes were related to gas exchange (net photosynthesis, transpiration rate, intercellular-to-ambient CO2 concentration ratio, mesophyll conductance, stomatal conductance, and photosynthetic water use efficiency) and the quantitative traits were related to biomass allocation (height, root collar diameter, root dry weight, shoot dry weight and harvest index). Univariate and multivariate analyses of the studied attributes indicated the presence of significant differences at both, the population and family levels. Although the populations differed significantly in all studied traits, a relatively small portion (5–15%) of the total variation was attributed to among populations. On account of the observed large intra-population variation, no trends between the studied traits and geography were detected when data from individual seedlings were used; however, significant trends were detected on population means for the majority of gas-exchange attributes. Population-level analyses indicated lack of appreciable relationship between the quantitative and adaptive attributes. Intra-population analyses produced high narrow-sense heritabilities for the majority of the attributes studied. The observed high intra-population variation that is accompanied with high genetic control over the studied attributes present an opportunity for genetic improvement. On the other hand, the observed significant differences among populations represent a challenge for gene conservation efforts as well as to the methods deployed to exploit these variations." @default.
- W2093816386 created "2016-06-24" @default.
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- W2093816386 date "1999-11-01" @default.
- W2093816386 modified "2023-09-29" @default.
- W2093816386 title "Genetic variation in mountain hemlock (Tsuga mertensiana Bong.): quantitative and adaptive attributes" @default.
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- W2093816386 doi "https://doi.org/10.1016/s0378-1127(99)00046-8" @default.
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