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Type of publication: conference paper
Type of publication (PDB): 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;Januškaitienė, Irena
Title: Different growth responses of Pisum sativum and Melilotus alba to 700 and 1500 ppm of carbon dioxide
Is part of: The vital nature sign [elektroninis išteklius] : 7-th international scientific conference : abstract book. Kaunas : Vytautas Magnus university, 2013, [no. 7]
Extent: p. 69-69
Date: 2013
Abstract: The aim of this work was to determine the growth responses of C3 legume crop pea (Pisum sativum L.) and weed white melilot (Melilotus alba Medik.) at the early stage (until 27 days after sowing) under current (350 ppm) and elevated (700 and 1500 ppm) CO2, in order to assess, how will respond a crop and a weed of the same family in monoculture conditions to future elevated CO2 concentrations. Experiments were conducted in the closed environment-controlled chambers. Duration of the experiment: 10 days. Measurements of physiological plant indices – photosynthetic rate (A), stomatal conductance (gs), transpiration rate (E), water use efficiency (WUE) and the ratio of intercellular to atmospheric CO2 concentrations (ci/ca) were carried out on the last day of treatment. Biochemical analysis (foliar and roots carbohydrates) and growth response (shoots and roots dry weight) of plants were carried out at the end of experiment. 700 and 1500 ppm elevated- CO2 increased photosynthetic rate by 46 and 66 % (p < 0.05) of pea plants and reduced gs by 53 and 39 % and E by 38 and 28 % (p < 0.05), which resulted in 1.4 and 1.3 times greater WUE, respectively, compare to pea plants gown in current-CO2. Despite significant decrease in gs the ci/ca ratio increased by 14 and 28 % (p < 0.05), respectively under 700 and 1500 ppm CO2, so this indicate, that plants grown in 700 and 1500 ppm CO2 environments had a higher intercellular CO2 concentration and the decrease of gs did not limited photosynthesis. Differently gs of white melilot plants grown at 700 and 1500 ppm CO2 increased by 39 and 54 % (p < 0.05) respectively, and E and ci/ca ratio also increased by 21 and 26 %, and 34 and 59 % (p < 0.05), respectively, compare to plants grown in current CO2. Whereas A was up-regulated significantly by 15 % only at 1500 ppm CO2, and this resulted in 16 and 9 % (p < 0.05) reduce of WUE, respectively, compare to current CO2. [...]
Affiliation(s): Aplinkotyros katedra
Vytauto Didžiojo universitetas
Appears in Collections:Universiteto mokslo publikacijos / University Research Publications

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