The Possible Mechanisms of Cadmium Accumulation in Tagetes erecta L. under Macronutrient Deficiency

Abstract:

An experiment was conducted under hydroponic culture conditions to determine effects of nutrient deficiencies on cadmium (Cd) accumulation of Tagetes erecta L. and its possible mechanisms. Seedlings of similar size were pre-cultured in either N- or P- deprived nutrient solution for 7 days before exposure to 0.1 mg Cd L^-1. The control plants had normal nutrient supply before and during Cd exposure. The plants were harveste after 7 days exposure to Cd. In N-deprived plants, Cd levels in roots, stems and roots were significantly reduced, which was consistent with a decrease of phytochelatins (PCs) in roots. Cd accumulation was the lowest in N-deficient plants, corresponding to substantial decreases in organic acids. In P-deprived plants, the obvious increase of Cd content in the root and stem and decrease of Cd content in the leaf accorded with increases of citric acid in the root and malic acid in the stem, supporting the suggestion that organic acids sequester soluble Cd and reduce Cd transport into the leaf.

• Periodical: Applied Mechanics and Materials (Volumes 178-181)
• Pages: 1060-1064
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.178-181.1060
• Online since: May 2012
• Authors: Qian Feng, Pei Dong Tai, Sha Sha Fu, Pei Jun Li, Yin Qiu Zhang
• Keywords: Cd Accumulation, Nutrient Deficiency, Organic Acid, Phytochelatins, Tagetes erecta L.

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