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Type of publication: Tezės kituose recenzuojamuose leidiniuose / Theses in other peer-reviewed publications (T1e)
Field of Science: Ekologija ir aplinkotyra / Ecology and environmental sciences (N012)
Author(s): Dikšaitytė, Austra;Viršilė, Akvilė;Januškaitienė, Irena;Juozapaitienė, Gintarė;Žaltauskaitė, Jūratė
Title: The joint effects of drought, heat and elevated Co2 on photosynthetic performance of Spring Oilseed Rape
Is part of: Smart Bio [elektroninis išteklius] : ICSB 3rd international conference, 02-04 May 2019, Kaunas, Lithuania : abstract book / Vytautas Magnus university. Panevėžys : UAB "Reklamos forma", 2019, Nr. 3
Extent: p. 249-249
Date: 2019
Keywords: Oilseed rape;Heatwave;Drought;Photosynthesis;Recovery
Abstract: Together with the steady rise in atmospheric CO2 concentration, extreme climatic conditions with extended drought periods and heatwaves, broadly defined as a period of consecutive days where conditions are hotter than normal, are predicted to increase in frequency and severity in many regions of the world. The aim of the present study was to determine the photosynthetic performance of spring oilseed rape (Brassica napus L.) under the 7-day drought, heatwave (HW, 21/14 vs. 33/26 ºC, day/night) and their combined treatments. Also, during the stress, a part of the plants was grown under elevated CO2 concentration (800 µmol mol−1 vs. 400 µmol mol−1 ), to investigate the possible mitigating its effect. Upon relief of the stressors and cessation of an additional CO2, plants were allowed to recover under the control growing conditions. The obtained results revealed that drought and heat acted in a different manner. At the end of the treatment, drought significantly decreased the photosynthetic rate (Asat), stomatal conductance (gs), transpiration (E) and the ratio of intercellular to ambient CO2 concentration (Ci/Ca), while increased water use efficiency (WUE). In contrast, well-watered plants grown under HW showed considerably increased the Asat, gs and E, while WUE decreased. Even so, the adverse effect of drought on gas exchange was highly exacerbated under HW with the combined stress leading to far greater reduction of Asat, gs, E and Ci/Ca. By improving WUE, CO2 enrichment alleviated the adverse effect of combination of heat and drought on Asat, during the stress, but it had no significant effect on the recovery.[...]
Affiliation(s): Aplinkotyros katedra
Gamtos mokslų fakultetas
Lietuvos agrarinių ir miškų mokslų centro filialas Sodininkystės ir daržininkystės institutas
Vytauto Didžiojo universitetas
Appears in Collections:Universiteto mokslo publikacijos / University Research Publications

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