Genetic variability in anatomical, physiological and growth characteristics of hybrid poplar (Populus x euramericana Dode (Guinier)) and eastern cottonwood (Populus deltoides Bartr.) clones
1998
Orlovic, S. | Guzina, V. | Krstic, B. | Merkulov, L.
Anatomical and physiological parameters of rooted cuttings of eight black poplar clones (4 Populus x euramericana, and 4 Populus deltoides) were evaluated in three field experiments on different soil types (humofluvisol, fluvisol f. loamy and fluvisol f. sandy). Measurements were taken on the thickness of assimilation tissues (palisade and spongy) on the cross section, and on net photosynthesis, dark respiration and leaf area. At the end of the vegetation period, the main plant growth elements were measured: diameter, height and biomass. The results showed a high interclonal variability for most parameters. Statistically significant differences among clones, regardless of site, indicated that the majority of study characters are controlled by genetic factors, specific to each clone. Most characteristics showed a statistically significant genotype x environmental interaction, as clone rankings at the three locations were not identical. The thickness of spongy tissue and plantheight exhibited the highest genotype x environmental interaction, while the number of stomates per mm(2) of the adaxial surface of the leaf, leaf area, and biomass showed the least sensitivity to environmental change. Strong correlations were shown between the number of stomates on leaf adaxial surface and biomass, thickness of palisade layer and biomass, leaf area and with height and biomass respectively. Leaf area, also was strongly correlated with height. The results indicate that the stomata number adaxial, thickness of palisade tissue, net photosynthesis, and leaf area can be used in the selection of nursery stock for the desired characteristics, that will result in higher biomass production. Construction of high yielding hybrids with desirable anatomical features was considered to be feasible.
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