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ŠUMARSKI LIST 7-8/2014 str. 29     <-- 29 -->        PDF

analysis of variance (ANOVA) with Fisher’s LSD test (post hoc analysis) were provided for each parameter in order to verify the significance of differences among provenances. In order to define the differences among the analyzed families, as well as to determine which of investigated parameters discriminate families in the highest level, canonical discriminant analysis (CDA) was performed.
Rezultati i rasprava
results of our study showed that families differ significantly in regards of intensity of transpiration (p≤0.001), stomatal conductance (p≤0.001) and water use efficiency (p≤0.001), while differences, among families, regarding net photosynthesis were not statistically significant (p≤0.124) (Table 2). As the environmental variability in nursery trials is minimized, differences in more uniform environments are likely to be the result of genetic differentiation (Meier & Leuschner 2008). Also, presence of significant differences in regards of E, gs and WUE indicate the possibility of choosing the best families for a breeding program in the climate conditions of Vojvodina province. Similar findings have been reported by Orlović et al. (1998) for poplar and by Orlović et al. (2006) for white willow, eventhough their results were based on the clone level.
The range of assimilation values recorded by our study is similar to those observed by other authors. For example, Niederleitner and Knoppik (1997) recorded net photosynthesis values of 9–17 μmol m–2 s–1 for five wild cherry clones in Germany. Transpiration rates recorded in our study were also similar to those of 4.5–5.5 mmol m–2 s–1 recorded by above mentioned authors. Also, stomatal conductance values were similar to those of 50–650 mmol m–2 s–1 reported for P. davidiana by Quilot et al. (2004).
According to Flexas et al. (2013), a key objective for sustainable forestry is to breed plants with both high carbon gain and water-use efficiency. Among the investigated families, Family 11, from the locality Jamena, was characterized by the highest rates of A, gs and WUE, and the lowest rate of E. Generally, families from lowland (1, 2, 11 and 13) showed more adaptive physiological response to prevailing climate conditions comparing to Family 7, which originates from a higher altitude (143 m a.s.l.). This is visible through the higher mean values of A and WUE in these families, as well as lower transpiration rate (Table 2). Chandra (2003) stated that the ability of plants to acclimate to different environments is directly or indirectly associated with their ability to acclimate at the level of photosynthesis, which in turn affects biochemical and physiological processes and, therefore, the growth of the whole plant.
Canonical discriminant analysis (CDA) was applied in order to estimate multivariate relationship among analyzed