Photosynthetic response of three climber plant species to osmotic stress induced by polyethylene glycol (PEG) 6000

We examined the photosynthesis response to osmotic stress in three climber plant species, Pharbitis nil (Linn.) Choisy, Lonicera japonica Thunb, and Parthenocissus tricuspidata (Sieb.et Zucc.) Planch. All climber plants were exposed to osmotic stress induced by polyethylene glycol (PEG) 6000 at 4 le...

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Bibliographic Details
Published in:Acta physiologiae plantarum 2012-09, Vol.34 (5), p.1659-1668
Main Authors: Xing, Deke, Wu, Yanyou
Format: Article
Language:English
Subjects:
Agriculture
Biomedical and Life Sciences
carbon
carbonate dehydratase
chlorophyll
fluorescence
Ipomoea nil
isotopes
leaves
Life Sciences
Lonicera japonica
Original Paper
osmotic stress
Parthenocissus tricuspidata
photosystem II
Plant Anatomy/Development
Plant Biochemistry
Plant Genetics and Genomics
Plant Pathology
Plant Physiology
polyethylene glycol
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Summary:We examined the photosynthesis response to osmotic stress in three climber plant species, Pharbitis nil (Linn.) Choisy, Lonicera japonica Thunb, and Parthenocissus tricuspidata (Sieb.et Zucc.) Planch. All climber plants were exposed to osmotic stress induced by polyethylene glycol (PEG) 6000 at 4 levels (slight, moderate, severe osmotic and the control) for 30 days. Photosynthesis response was determined by measuring leaf photosynthesis, chlorophyll fluorescence, carbonic anhydrase activity and stable carbon isotope ratios. P. nil maintained high photosynthetic activity under long-term moderate osmotic stress due to both stable photosystem II photochemical efficiency and high carbonic anhydrase activity. L. japonica maintained high photosynthetic activity under long-term moderate stress due to high carbonic anhydrase activity rather than photosystem II photochemical efficiency. P. tricuspidata tolerated only short-term moderate osmotic stress and long-term slight osmotic stress because its response was mainly stomatal limitation, with the lowest photosynthetic activity and hardly any carbonic anhydrase activity. Carbonic anhydrase activity was inversely correlated with stable carbon isotope ratios. The regulation by carbonic anhydrase was probably the reason for P. nil and L. japonica to tolerate long-term moderate osmotic stress. The selection on the species should consider the differential adaptation mechanism to osmotic stress during the development of drought-resistant plants.
ISSN:0137-5881
1861-1664
DOI:10.1007/s11738-012-0961-7