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- Title
DROUGHT EFFECTS ON THE PHYSIOLOGICAL AND BIOCHEMICAL PARAMETERS OF AMARANTH (C-3) AND ACTINIDIA (C-4) PLANTS.
- Authors
MOTYLEVA, S. M.; GINS, M. S.; KABASHNIKOVA, L. F.; KOZAK, N. V.; TETYANNIKOV, N. V.; PANISCHEVA, D. V.; MERTVISCHEVA, M. E.; DOMANSKAYA, I. N.; PILIPOVICH, T. S.
- Abstract
Drought is one of the limiting factors affecting the environment worldwide. It adversely affects crop plant growth and development. The stressful effects of arid conditions cause changes in the morphological traits and physiological processes of plants. This study, photosynthetic pigment contents, photosynthetic system 2 (PS2) activity, antioxidant activity, and total phenolic compound (TPC) amounts were determined in the leaf extracts of two species of amaranth (with C4-type photosynthesis), namely, Amaranthus tricolor L. cultivar 'Valentina' and Amaranthus cruentus L. cultivar 'Krepysh'. The same parameters were determined in two species of actinidia (with C3-type photosynthesis), specifically, Actinidia arguta cultivar 'Taezhny Dar' and Actinidia kolomikta cultivar 'Narodnaya'. All parameters were measured before and after drought stress. The seedlings were initially grown in the laboratory, then planted in separate pots and kept in the greenhouse under a canopy to protect them from the rain. Chlorophyll (Chl) a and b, carotenoids, antioxidant activity, and phenolic compound contents were determined spectrophotometrically. PS2 activity was determined by using pulse amplitude modulation fluorometry. The functional state of PS2 was more resistant to water deficiency and drought in amaranth than in actinidia species. Certain differences were established in the resistance of PS2 to dehydration between the two species of amaranth under drought conditions, and the highest Chl fluorescence indexes were characterized in the tricolor amaranth cultivar 'Valentina'. Car content was 6.5 times higher in the leaves of A. arguta and 2.5 times higher in the leaves of A. kolomikta than in the leaves of the control plants. The highest correlation was found between Chl a and Car (r = 0.985) and Chl b and Car (r = 0.977) in the leaves of both species of amaranth. Under moisture deficit conditions, the antioxidant activity of water and alcohol extracts in the leaves of both species of amaranth increased from 1.5 time to 2.5 times. A high correlation (r = 0.77, r = 0.91) was found between the antioxidant activity of the water and alcoholic extracts and the TPC in the leaves of both amaranth species, respectively.
- Subjects
AMARANTHS; ACTINIDIA; PULSE amplitude modulation; CROPS; DROUGHTS; PHOTOSYNTHETIC pigments
- Publication
SABRAO Journal of Breeding & Genetics, 2021, Vol 53, Issue 2, p248
- ISSN
1029-7073
- Publication type
Article