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Ukr. Bot. J. 2016, 73(6): 587–592
https://doi.org/10.15407/ukrbotj73.06.587
Plant Physiology, Biochemistry, Cell and Molecular Biology

Features of seasonal dynamics of photosynthetic pigments in species of the genus Pinus (Pinaceae)

Terlyga N.S.
Abstract

Content of photosynthetic pigments and total water content in tissues of pine needles have been studied in six species of Pinus. The dynamics thereof under different humidity conditions during summer season has been demonstrated. The total pigment content in the species under investigation varied per month (June–August) from 0.83 to 2.60 mg/g of raw substance, with the highest values being recorded for representatives of the Eupitys Spach. section: in June, for P. pallasiana – 1.38 mg/g and P. sylvestris – 1.24 mg/g; in July, P. mugo – 1.45 mg/g of raw substance. With a high amount of rainfall (June), the level of chlorophyll a in the studied species was 1.2 to 2.2 times higher than that found under conditions of prolonged drought (July–August). The maximum values of the total water content of pine needle tissues in all studied species were identified at the high amount of average monthly rainfall. Under significant deficit of rainfall, the maximum decrease in total water content of pine needle tissues and the minimum content of photosynthetic pigments were observed in the needles of P. strobus and P. ponderosa.

Keywords: Pinus, chlorophyll a and b, carotenoids, pine needles, water content

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