Within-population variation in juvenile growth rhythm and growth in Quercus robur L. and Fagus sylvatica L.
2001
Baliuckas, V. (Lithuanian Forest Research Inst., Girionys (Lithuania). Department of Forest Genetics and Reforestation) | Lagerstroem, T. | Eriksson, G.
The study was conducted to evaluate the genetic parameters in adaptive and growth traits within five Swedish populations of Quercus robur L. and three populations of Fagus sylvatica L. The Quercus robur populations had 27-30 families in each, sampled at latitudes 55` 34' to 60` 12' and the Fagus sylvatica populations had 28-30 families in each, sampled at latitudes 55` 28' to 57` 33'. The 1-year old seedlings of Quercus robur were planted in nursery experiments at two distant sites at latitudes 59` 40' and 56` 38'. The 1-year old seedlings of Fagus sylvatica were planted only at the southern site. The plants were assessed yearly at ages 3-6 and some years twice for growth rhythm traits. Large and significant family effects were obtained for all traits, except for growth cessation and height in some Fagus sylvatica populations. Large coefficients of additive variation were obtained. The family ~ site interaction in Quercus robur populations was more pronounced for growth cessation and height, than for bud flushing with a larger family ~ site component for the southern populations. Stable and strong genetic correlations were obtained for bud flushing in different years and weaker, but stable correlations for growth cessation. Bud flushing and height genetic correlations showed a tendency to change with age from positive or slightly negative to negative. This trend was most pronounced in Quercus robur populations. These correlations were almost always negative in Fagus sylvatica populations. Late growth cessation was correlated with height. Thanks to the large and significant family effect, all populations in both species demonstrated high potential for adaptation and long-term breeding, which is most beneficial for gene conservation
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