Mycorrhizal Fungi Enhance Chromium Uptake by Sunflower Plants: Influence on Tissue Mineral Concentration, Growth, and Gas Exchange.

by Fred T. Davies, Jr., J. D. Puryear, R. J. Newton, J. N. Egilla, and J. A. Saraiva Grossi

As a potential phytoremediation system for phytoextraction of chromium (Cr), we evaluate the influence of the arbuscular mycorrhizal fungus Glomus intrardices on leaf tissue elementary composition, growth and gas exchange of sunflower (Helianthus annuus L.). Sunflower seedlings were either inoculated with mycorrhizal fungi (AM) or non-inoculated (Non-AM) and then exposed to two Cr species: {12 mmol of trivalent cation (Cr+3) [Cr(III)] or 0.1 mmol of divalent dichromate anion (Cr2O7-) [Cr(VI)]}. Both Cr species depressed plant growth, decreased stomatal conductance (g) and net photsynthesis (A).

Journal of Plant Nutrition, Vol. 25, No. 11, pp. 2389-2407, 2002.