期刊
BIOLOGIA PLANTARUM
卷 56, 期 4, 页码 711-716出版社
SPRINGER
DOI: 10.1007/s10535-012-0241-9
关键词
chlorophyll content; chlorophyll fluorescence; photosynthetic rate; photosystem II; stomatal conductance; thylakoids; transpiration rate
资金
- Sigma Xi [G200803150008]
The effects of lead toxicity on leaf gas exchange, chlorophyll content, chlorophyll fluorescence, chloroplast ultrastructure, and opening of stomata were examined in tobacco (Nicotiana tabacum L.) plants. Plants were grown in a growth chamber for 7 d in Hoagland nutrient solution supplemented with 0.0 (control), 5, 10, 25, 50, 100, 300 and 500 mu M Pb(NO3)(2). Plants treated with 5, 10, and 25 mu M Pb(NO3)(2) exhibited no abnormalities. Root and shoot growth, net photosynthetic rate and stomatal conductance were significantly reduced in plants treated with 100, 300 and 500 mu M Pb(NO3)(2). In plants treated with 500 mu M Pb(NO3)(2), the majority of stomata were closed. The effect of Pb(NO3)(2) on chlorophyll content and chlorophyll fluorescence parameters was negligible. However, in plants exposed to 100, 300, and 500 mu M Pb(NO3)(2), the mesophyll cells showed altered chloroplasts with disrupted thylakoid membranes.
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