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Title: Cadmium toxicity affects photosynthesis and plant growth at different levels
Author: Dias, Maria Celeste
Monteiro, Cristina
Moutinho-Pereira, José
Correia, Carlos
Gonçalves, Berta
Santos, Conceição
Keywords: Cadmium
Issue Date: 2013
Publisher: Springer
Abstract: 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 μM 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 μM 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 μM 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.
Peer review: yes
DOI: 10.1007/s11738-012-1167-8
ISSN: 0137-5881
Appears in Collections:CESAM - Artigos
DBio - Artigos

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