Journal of Food, Agriculture and Environment

Interactive effects of elevated CO₂, temperature and water stress on  Apera spica-venti L. 

Author(s):

Sandra Sakalauskienė, Jurga Sakalauskaitė, Sigitas Lazauskas, Virmantas Povilaitis *, Ona Auškalnienė, Gabrielė Pšibišauskienė, Giedrė Samuolienė, Aušra Brazaitytė, Pavelas Duchovskis

Recieved Date: 2012-09-29, Accepted Date: 2013-01-19

Abstract:

Effects of elevated CO₂, temperature and water availability on Apera spica-venti plants were examined in growth chambers of controlled environment. Plants at the III – IV organogenesis stage were grown in normal (~40%) or drought (<10%) substrate and treated with investigated factor combinations: day/night temperature 21/14°C x CO₂ – 350 ppm; 30/23°C x CO₂ – 350 ppm; 21/14°C x CO₂ – 700 ppm; 30/23°C x CO₂ – 700 ppm. After 10 days treatment, leaf area, dry biomass, and the contents of photosynthetic pigments, total phenolic compounds, non-structural carbohydrates and DPPH free-radical scavenging capacity were determined. Growth and physiological traits of A. spica-venti differed in their responses to examined environmental factors and their combinations. Under ambient or elevated CO₂ and temperature conditions, substrate moisture shortage resulted in significantly lower dry biomass and leaf area of plants. Influence of investigated factors on chlorophyll a and b content was insignificant, while content of carotenoids was significantly affected by CO₂ and temperature interaction (CO₂ x T). Total non-structural carbohydrate content in A. spica-venti plants varied according to applied investigated environment factors and their interaction. Independent on temperature, moisture deficiency caused an increment of phenolic compounds at ambient CO₂. 

Keywords:

DPPH, growth indices, phenols, photosynthetic pigments, non-structural carbohydrates

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Journal: Journal of Food, Agriculture and Environment
Year: 2013
Volume: 11
Issue: 1
Category: Environment
Pages: 1121-1124

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