Effects of strontium on photosynthetic characteristics of oilseed rape seedlings

The threat of environmental strontium pollution led to an increased interest to elucidating the mechanisms of this metal toxicity in the organism. To investigate strontium effects on vital photosynthesis characteristics, three-leaf stage oilseed rape seedlings (Brassica napus L., cv. Mianyou No.15),...

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Bibliographic Details
Published in:Russian journal of plant physiology 2012, Vol.59 (6), p.772-780
Main Authors: Chen, M, Tang, Y. L, Ao, J, Wang, D
Format: Article
Language:English
Subjects:
absorption
Biomedical and Life Sciences
Brassica napus var. napus
carbon
chlorophyll
energy transfer
evolution
exposure duration
hydroponics
leaves
Life Sciences
oxygen
phosphoenolpyruvate carboxylase
photosynthesis
Plant Physiology
Plant Sciences
pollution
Research Papers
ribulose-bisphosphate carboxylase
roots
seedlings
strontium
toxicity
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Summary:The threat of environmental strontium pollution led to an increased interest to elucidating the mechanisms of this metal toxicity in the organism. To investigate strontium effects on vital photosynthesis characteristics, three-leaf stage oilseed rape seedlings (Brassica napus L., cv. Mianyou No.15), raised in the hydroponic culture, were provided with a nutrient solution containing 0, 10, 20, and 40 mM SrCl2. Strontium uptake and distribution in oilseed rape plants and its effect on various aspects of photosynthesis were investigated after 0, 7, 14, and 21 days of strontium treatment. Oilseed rape seedlings demonstrated a strong ability of strontium accumulation. Strontium absorbed by roots was primarily transferred to leaves and accumulated there. The leaf photosynthetic oxygen evolution rate, chlorophyll content, and Rubisco (EC 4.1.3.9) and phosphoenolpyruvate carboxylase (PEPCase; EC 4.1.1.31) activities declined progressively with increasing concentration of applied strontium and also with increasing the duration of exposure time. These results indicate that strontium accumulated in leaves damaged various processes of photosynthesis, such as energy absorption, energy transfer, and photosynthetic carbon assimilation.
ISSN:1021-4437
1608-3407
DOI:10.1134/s1021443712060052