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The response of tomato plants to long-term cadmium exposure was evaluated after a 90-days long culture in hydroponic conditions (0, 20, and 100μM CdCl(2)). Cadmium preferentially accumulated in roots, and to a lower extent in upper parts of plants. Absolute quantification of 28 metabolites was obtained through (1)H NMR, HPLC-PDA, and colorimetric methods. The principal component analysis showed a clear separation between control and Cd treated samples. Proline and total ascorbate amounts were reduced in Cd-treated leaves, whereas α-tocopherol, asparagine, and tyrosine accumulation increased, principally in 100μM Cd treated leaves. Carotenoid and chlorophyll contents decreased only in 100μM Cd-mature-leaves, which correlate with a reduced expression of genes essential for isoprenoid and carotenoid accumulations. Our results show that tomato plants acclimatize during long-term exposure to 20μM Cd. On the contrary, 100μM Cd treatment results in drastic physiological and metabolic perturbations leading to plant growth limitation and fruit set abortion.
UR Biologie et Physiologie Cellulaires Végétales, Département de Biologie, Faculté des Sciences de Tunis, El Manar, 1060 Tunis, Tunisia; UMR 619 Biologie du Fruit, Centre INRA de Bordeaux, Université de Bordeaux IBVM, BP 81, Villenave d'Ornon, F-3314
This article was published in the following journal.
Name: Ecotoxicology and environmental safety
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