Abstract
The morphological, biochemical, and physiological characteristics of silver birch (Betula pendula Roth), curly birch (B. pendula Roth var. carelica), and downy birch (B. pubescens Ehrh.) at early stages of ontogenesis in natural conditions were investigated. Some intra- and interspecific peculiarities of the morphophysiological properties were determined. Priority development of the underground mass for the seedlings of curly birch and that of the aboveground mass for the seedlings of silver birch and downy birch were found. The leaf of curly birch is developed more actively as compared with those in the other two species under equal potential possibility of the growth of their leaves by elongation. A high similarity of the mineral composition (C, N, P, K) of different forms and species of birches was demonstrated. For silver birch the maximum values of the stomatal conductance, rate of photosynthesis, and transpiration under similar atmospheric and soil conditions were obtained. In downy birch we found a higher efficiency of water use. The highest values of the maximum rate of ribulose 1,5-bisphosphate carboxylase/oxygenase carboxylation were found in curly birch. This may serve as an indicator of its shade tolerance, as compared with silver birch and downy birch.
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Original Russian Text © V.B. Pridacha, V.K. Bolondinskii, A.V. Olchev, T.A. Sazonova, 2017, published in Izvestiya Akademii Nauk, Seriya Biologicheskaya, 2017, No. 2, pp. 114–119.
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Pridacha, V.B., Bolondinskii, V.K., Olchev, A.V. et al. Structural and functional peculiarities of plants from the genus Betula L. at early stages of ontogenesis. Biol Bull Russ Acad Sci 44, 144–149 (2017). https://doi.org/10.1134/S1062359017020157
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DOI: https://doi.org/10.1134/S1062359017020157