Труды Кубанского государственного аграрного университета

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2017, № 67

UDC: 582.788.1:581.5
GSNTI: 68.35.57:34.35.15

Dependence of photosynthesis in Aucuba japonica variegata Thunb. from environmental factors under normal conditions and under soil drought conditions

Despite the wide distribution in cultivation, the Genus Aucuba Thunb. is one of the least studied. Not enough quantitative data about the needs of plants to light, heat and soil moisture. In this paper, in the framework of the more General problem of research of influence the environmental factors to the CO2 gas exchange of evergreen exotic plants was analyzed the changes in parameters of photosynthesis and water relation features of Aucuba japonica variegata Thunb. under normal conditions and under soil drought conditions. Identified optimal region and threshold values of soil moisture, temperature and light limiting photosynthesis rate in A. japonica variegata during summer-autumn period of active growth on the Southern coast of the Crimea. It was established that A. japonica variegata is a typical mesophyte and begins sense a water stress deficit during the critical period of active growth at reduce soil moisture content to 14-20%. As adaptation to summer drought and high temperatures under conditions the Southern coast of the Crimea for A. japonica variegata is the development of seasonal rhythms of active growth, giving the opportunity to use the growing season more favourable periods of the year: April-May and August-September. Optimal light and temperature conditions for intensive growth: leaf temperature from 15 to 26оC, air temperature - 13-17оC, light regime: part-shade or shade in the range 300-1250 µmol m-2s-1 (15-60% of full light) when soil moisture 70-90% full moisture-holding capacity. With increasing levels of irradiance above 1300 µmol m-2s-1 photoinhibition impairs light acclimation and can cause photodestruction of the photosynthetic apparatus of A. japonica variegata that must be considered in the cultivation of this species.
Keywords: Aucuba japonica variegata Thunb, net photosynthesis rate, soil drought, ecological characteristics of plants, environmental factors
DOI: 10.21515/1999-1703-67-102-106


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  1. Korsakova Svetlana Pavlovna, Phd. Biol. Sciences, art. Sci. Phytomonitoring laboratory worker, FSBIS «The Order of the Red Banner Nikita Botanical Gardens - National Scientific Center» RAS.