期刊
ACTA PHYSIOLOGIAE PLANTARUM
卷 35, 期 4, 页码 1281-1289出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s11738-012-1167-8
关键词
Cadmium; Nutrients; Photosynthesis; Pigments; Rubisco
资金
- Portuguese Foundation for Science and technology (FCT) [FCT/PTDC/AAC-AMB/112804/2009]
- FCT [SFRH/BPD/41700/2007, SFRH/BD/48204/2008]
- Fundação para a Ciência e a Tecnologia [SFRH/BD/48204/2008, SFRH/BPD/41700/2007, PTDC/AAC-AMB/112804/2009] Funding Source: FCT
In this article we discuss and update some of the effects of Cd toxicity on the photosynthetic apparatus in a model crop Lactuca sativa. Seeds of L. sativa were germinated in solutions with 0, 1, 10 and 50 mu M of Cd(NO3)(2) and then transferred to a hydroponic culture medium. After 28 days, the effects of Cd on the photosynthetic apparatus of lettuce were analysed. Exposure of lettuce to 1 mu M Cd(NO3)(2) affected already plant growth (dry biomass), but, did not induce serious damages in the photosynthetic apparatus. However, increasing concentrations of this metal to 10 and 50 mu M promoted a strong reduction of the maximum photochemical efficiency of PSII and an impairment of net CO2 assimilation rate, putatively due to Rubisco activity decrease. This ultimately results in a strong inhibition of plant growth. Nutrient uptake and carbohydrate assimilation were also severely affected by Cd.
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