Page 20 - Book of Abstracts

5 International Scientific Online Conference DOI: https://doi.org/10.15414/2021.9788055224015
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BIOLOGICAL, ECOLOGICAL, ANATOMICAL-MORPHOMETRIC FEATURES OF
REPRESENTATIVES OF THE GENUS JUGLANS L.
Oleksandra Aboimova, Volodymyr Levon

M.M. Gryshko National Botanical Garden of the National Academy of Sciences of Ukraine
Kyiv, Ukraine; E-mail.: aboimovaaleksandra@gmail.com

The introduction study of plants involves the attraction of new species from different
floristic regions of the Earth. Species of the genus Juglans L. are of Holarctic origin. The natural
range of the genus is located in the countries of Asia, America, and Europe. J. nigra L., J. cinerea
L. originated from the Boreal sub-kingdom, the Atlantic-North American floral region. J.
ailanthifolia var. cordiformis Maх. belongs to the Boreal Kingdom. J. mandshurica Maxim., J.
ailanthifolia Carr. originated from the East Asian floristic region. The Madrean sub-kingdom
includes J. major Torr., J. microcarpa Berland., of the Madrean floristic region. From the Ancient
Mediterranean sub-kingdom (Iran-Turan floristic region) originated J. regia L., J. regia L. f.
fertillis Petzet Kirch.
The research aims to investigate the water regime, anatomical and morphometric features
of plant leaves of species of the genus Juglans in connection with their drought resistance.
According to the results of studies of drought resistance, no significant signs of wilting
were revealed in plants of the species of the genus Juglans in the conditions of the Right-Bank
Forest-Steppe of Ukraine. It was found that the indicators of drought resistance of plants of the
genus Juglans were 3–4 points in representatives of the East Asian (Japanese-Chinese) floral
region (J. ailantifolia var. cordiformis, J. ailantifolia, J. mandshurica). Drought resistance of plants
J. regia f. fertillis, J. regia (Iran-Turan floristic region) it was 5 points. According to the visual
scale, the indicator of drought resistance of plants from the Atlantic-North American (J. nigra, J.
cinerea) and Madrean floristic regions (J. microcarpa and J. major) was estimated at 5 points. It
was found that for 24 hours after collecting the leaves, the water loss (J. ailanthifolia) was 27.0
±1.21 % of the initial raw mass, J. mandshurica – 2.5 ±2.91 %. The lowest water loss was
recorded in plants from the Iran-Turan floristic region (J. regia 20.6 ±0.74 %). The
determination of the total water in the leaves showed that its content was highest in J. regia
(34.6 ±0.67 %). This indicator was the lowest in plants from the Japanese-Chinese floristic
region (J. ailantifolia) – 27.8 ±0.47 %. The water deficiency was highest in the leaves of plants
from the Japanese-Chinese floristic region in J. ailanthifolia (11.8 ±0.12 %). The lowest indicator
was recorded in plants from the Iran-Turan floristic region (J. regia) – 10.0 ±0.32 %.
It was found that the resistance to drought in plants of the genus Juglans is due to the
anatomical and morphological structure of the leaf. The stomatal apparatus of the leaves of the
studied species is the anomocytic. A correlative relationship between the size of stomata and
the parameters of drought resistance is established. The smallest stomatal area was noted in
the leaves of the more drought-resistant species J. regia 245.52 ±10.34 mm ; in the less drought-
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resistant species J. ailanthifolia this indicator was 305,01 ±7,61 mm . The studied species of the
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genus Juglans are characterized by the presence of trichomes that are placed on the abaxial and
adaxial surfaces of the leaves, which is a manifestation of xeromorphy. The parameters of the
thickness of the spongy parenchyma were established, which ranged from 61.92 ±1.1 (J. regia)
to 73.70 ±1.5 microns (J. mandshurica). A decrease in the thickness of the parenchyma is a
manifestation of the xeromorphy of plants.
Anatomical and morphological parameters of the leaves of the studied species indicate
that they are ecologically plastic and can adapt to arid growth conditions.

Keywords: Juglans, drought resistance, leaves, xeromorphy, parenchyma.

5 International Scientific Conference Agrobiodiversity for Improving the Nutrition, Health, Quality of Life and |19
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Spiritual Human Development
November 3 2021
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