Abstract
AbstractThe paper reports the results of a comparative study of the anatomical structures of the leaf blades of Waldsteinia ternata grown under different light conditions in the Siberian Botanical Garden of Tomsk State University. Waldsteinia ternata is a tertiary nemoral relict from the mountains of southern Siberia, which is found in a limited number of taiga communities due to narrow environmental tolerance to various factors. The species remains poorly studied; comprehensive studies of the anatomical features of its leaves have not been performed on the territory of Russia. Leaves of W. ternata are dorsoventral and amphistomatous with anomocytic type stomata. The plants are classified as mesophytes. The relationship between the development of the anatomical structure of leaves and light conditions was revealed. The W. ternata plants grown in the sun showed an increased number of stomata and epidermal cells, an increased thickness of the leaf and mesophyll, and an increased number of cells of the upper and lower epidermis, that is, the plants exhibited heliophytic features of plant adaptation to good light conditions. At the same time, the vascular tissues of the plants grown in the sun were less developed, which reflected their adaptation to unfavorable water conditions. A number of relative indicators, such as the stomatal index of the lower epidermis, the ratio of the palisade to spongy mesophyll, and the ratio of xylem to phloem, did not change under different growth conditions. Thus, under different light and water conditions, W. ternata acquires helioxeromorphic or sciomesomorphic features.
Highlights
Conservation of plant species as a source of biological diversity and genetic resources is an essential part of the Global Strategy for Plant Conservation adopted in 2002 at the VI International Conference of the Parties to the Convention on Biological Diversity (Jackson 2012)
The aim of this study is a comparative investigation of the anatomical structures of the leaf blades of W. ternata introduced under different light conditions in the Siberian Botanical Garden of Tomsk State University
Waldsteinia ternata grown under different light conditions were different in the external dimensions of leaves, as well as in the size and shape of their anatomical structures
Summary
Conservation of plant species as a source of biological diversity and genetic resources is an essential part of the Global Strategy for Plant Conservation adopted in 2002 at the VI International Conference of the Parties to the Convention on Biological Diversity (Jackson 2012). Waldsteinia ternata (Steph.) Fritsch (Rosaceae) is a Eurasian species with a disjunctive range and classical location in the Khamar-Daban ridge (Chepinoga et al 2019). It grows in dark coniferous, larch, poplar, birch, and mixed forests, river floodplains, bushes, and willow woods (Yamskikh 2015). The densest populations are observed on forest fringes and along forest paths (Kazanovskiy and Chepinoga 2020)
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