Water regime of the leaves of plants of Deutzia Thunb. genus due to their drought tolerance in the conditions of introduction in the northen part of the forest-steppe of Ukraine
DOI:
https://doi.org/10.31548/dopovidi2020.04.004Keywords:
Deutzia Thunb., leaf, water regime, drought toleranceAbstract
Deutzias are ornamental and resistant to technogenic pollution shrub plants that are widely used in landscaping. They were introduced to Ukraine in the mid-nineteenth century. Resistance to various adverse environmental factors, in paticular to drought, is important for such plants. Visual assessment of field drought tolerance of plants is not always sufficient; moreover, it does not reflect the smallest reactions of the plant at the physiological level. Therefore, it was decided to determine the degree of drought tolerance of plant species and cultivars of the genus Deutzia from the arboretum collection of the M.M. Gryshko National Botanical Garden (NBG) of the NAS of Ukraine by studying the water regime of leaves by the weight method according to M.D. Kushnirenko. The objects of our study were plants of the following species and cultivars of the genus Deutzia from the collection of the NBG arboretum: D. ×elegantissima (Lemoine) Rehd., D. gracilis Sieib. et Zucc., D. ×magnifica (Lemoine) Rehd., D. mollis Duthie, D. ×rosea (Lemoine) Rehd., D. scabra Thunb., D. schneideriana Rehd., D. scabra 'Candidissima', D. scabra 'Plena', D. longifolia 'Sessiliflora'. The age of the studied plants is about 60 years. The study was carried out in the second decade of June 2018 during the period of active growth of shoots. It was preceded by a long period without precipitation. Leaves of all stadied plants of the genus Deutzia quite intensively lose water during twenty-four hours. In two hours after the beginning of wilting the leaves of the studied plants lost from 23,8±0,22% to 52,4±2,42% of water from its content at full water saturation, and in 24 hours – from 92,3±0,3 % to 98,5±1,52 %. D. gracilis leaves lost water less intensively, and D. mollis lost water most intensively. The water content in the leaves of all studied plants was restored, althoufh to a different degrees (by 17.8±3.55–53.9±2.08% of its content when fully saturated). According to the results of this study D. gracilis and D. × elegantissima were most resistant to drought. The least resistant to drought are D. schneideriana, D. mollis and D. scabra. In general, plants of the genus Deutzia are sensitive to water deficiency in the soil, but they are able to renew water lost after prolonged drought.
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