biologia plantarum

International journal on Plant Life established by Bohumil Němec in 1959

Biologia plantarum 54:583-586, 2010 | DOI: 10.1007/s10535-010-0105-0

Changes in biomass and photosynthetic parameters of tomato plants exposed to trivalent and hexavalent chromium

F. S. Henriques1,*
1 Plant Biology Unit, Department of Life Sciences, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Caparica, Portugal

Tomato plants were treated for two weeks with different concentrations of Cr(III) or Cr(VI) compounds to compare their toxic effects. The concentration of total Cr in plant tissues increased linearly with its concentration in the growth medium and Cr accumulated largely in the roots, regardless of the form in which it was supplied to the plant. All measured plant growth parameters were negatively affected by Cr, but Cr(VI) showed much more pronounced toxic effects. Leaf net photosynthetic rate (PN) was decreased by both Cr forms, and the decrease was also greater for Cr(VI). Cr(III) caused no significant effect on leaf stomatal conductance, whereas Cr(VI) reduced it. Cr(VI) also markedly reduced the variable to maximum chlorophyll a fluorescence ratio, measured in dark-adapted leaves.

Keywords: chlorophyll fluorescence; Cr toxicity; Lycopersicum esculentum; net photosynthetic rate; stomatal conductance
Subjects: chlorophyll fluorescence; chromium; CO2 concentration, internal; growth and growth analysis; Lycopersicon esculentum; photosynthetic rate; stomatal conductance; tomato

Received: December 22, 2008; Accepted: August 11, 2009; Published: September 1, 2010  Show citation

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Henriques, F.S. (2010). Changes in biomass and photosynthetic parameters of tomato plants exposed to trivalent and hexavalent chromium. Biologia plantarum, 54(3), 583-586. doi: 10.1007/s10535-010-0105-0
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