The Impact of <i>Cameraria ohridella</i> (Lepidoptera, Gracillariidae) on the State of <i>Aesculus hippocastanum</i> Photosynthetic Apparatus in the Urban Environment
2022
Kyrylo Holoborodko | Oksana Seliutina | Anna Alexeyeva | Viktor Brygadyrenko | Iryna Ivanko | Mariya Shulman | Olexander Pakhomov | Iryna Loza | Svitlana Sytnyk | Viktoriia Lovynska | Yurii Grytsan | Liubov Bandura
The paper presents the results on resistance of <i>Aesculus hippocastanum</i> Linnaeus, 1753 trees to <i>Cameraria ohridella</i> Deschka & Dimić, 1986 (Lepidoptera, Gracillariidae) impact under conditions of a modern urban environment on the example of Dnipro city as the largest industrial city in Ukraine. Field experiments were conducted in all park areas of the city, which allowed covering the full gradient of the existing urban environment and considered the different degrees of the tree settlement by the invasive insect species. The research of the impact of <i>C.</i> <i>ohridella</i> caterpillars’ vital activity on the photosynthetic apparatus state was carried out by applying a chlorophyll fluorescence induction technique. Diagnosis of photosynthetic dysfunction of fresh <i>Ae.</i> <i>hippocastanum</i> leaves was conducted using a portable “Floratest” fluorometer manufactured in Ukraine. Interpretation of the obtained Kautsky curves showed that significant changes in their critical parameters associated with the degree of leaf damage by <i>C.</i> <i>ohridella</i> caterpillars were not detected. The influence of tree growth site conditions on the following 4 main indicators of chlorophyll fluorescence induction was established: the initial value of fluorescence induction after irradiation; the value of “plateau” fluorescence induction; the maximum value of fluorescence induction; the stationary value of fluorescence induction after light adaptation of the plant leaf. It was found that the efficiency coefficients of photochemical processes in <i>Ae. hippocastanum</i> trees growing in low terrain levels differed significantly, which can probably be interpreted as their response to the specific characteristics of the urban environment.
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