SodininkyStĖ ir darŽininkyStĖ 28(2)

SODININKYSTĖ IR DARŽININKYSTĖ. SCIENTIFIC ARTICLES. 2009. 28(2).The integrated impact of environmental factors on photosyntheticpigments in pea plant (Pisum sativum L.)S. Sakalauskienė, A. Brazaitytė, J. Sakalauskaitė, S. Lazauskas,A. Urbonavičiūtė, G. Samuolienė, G. Šabajevienė, P. DuchovskisSummaryThe objective of this study was to investigate integrated impact of environmental factorson photosynthetic pigments in pea plants (Pisum sativum L.). The vegetative experiments werecarried out in growth chambers of controlled environment at Laboratory of Plant Physiology,Lithuanian Institute of Horticulturae, in 2008. Pea (Pisum sativum L.) cv. ‘Gloriosa’ was chosenas the object of this study. Pea plant response to UV-B radiation and moisture regime underdifferent carbon dioxide and temperature was investigated. Photosynthetic pigments content inplant leaves depended on all the investigated environmental factors. Chlorophylls and carotenoidscontent in pea leaves varied according to the changing environment conditions. Droughtand intensifying UV-B radiation had adverse impact on chlorophyll a and carotenoids contentin pea leaves. Elevated temperature and intensifying UV-B radiation, independent of carbondioxide concentration, induced the accumulation of chlorophyll b in pea plants, which weregrown in substratum of normal (40–45 %) and moderate (20–25 %) moisture. Chlorophyll aand carotenoid content in pea plants, grown in substratum of normal (40–45 %) and moderate(20–25 %) moisture under elevated temperature and carbon dioxide concentration, varied inconsiderable,but intensifying UV-B radiation induced a greater accumulation of chlorophyll b.Key words: environmental factors, pea plant (Pisum sativum L.), photosynthetic pigments.145