Chromium is toxic in high amounts to both plants and humans but the toxicity depends on the valency; chromium VI being substantially more toxic. At plants that purchase chromic sulfate in powder form, dust containing trivalent chromium may be emitted during storage, handling, and mixing of the dry chromic sulfate. Contamination of soil and water by chromium (Cr) is of recent concern. : Cobalt, chromium and nickel contents in soils and plants of heavy metals, which limits the development of bacteria, plants and animals (Deng et al., 2006; Ali et al., 2013). depends on its valence state with Cr6+being more toxic andmobilethanCr3+[,–].e hexavalentchromium is toxic for agricultural plants at concentrations of about.–.mgmL −1inthenutrientsolutionand –mgg −1 inthesoil.Underphysiologicalconditions,concentrationof chromiumionsinplantsislessthan gg−1[,]. Chromium toxicity. In the periodic table, it is situated in the d block of the elements. Due to its wide industrial use, chromium is considered a serious environmental pollutant. The lack of nutrients and anomalous physicochemical properties means that the establishment of plant cover is Panda, S. Choudhury Journal name Brazilian Journal of Plant Physiology Year 2005 Volume and Issue Volume 17 Pages Abstracts The article presents an overview of the mechanism of chromium stress in plants. Cr toxicity in plants depends on its valence state. The atomic number of chromium is 24, the atomic mass is 51.996, the density 7.2 g cm-3, the melting point is plants preventing the functioning of their general metabolism (Turner 1997). In the current experiment, the exogenous Cr exists in several oxidation states but the most stable and common forms are Cr(0), Cr(III) and Cr(VI) species. Toxicity of chromium for plants depends on its valence state with Cr 6+ being more toxic and mobile than Cr 3+ [12, 29–32]. The buffing operation also releases particulates, which may contain chromium. Ten to 12 ppm Cr(VI) was found inhibitory to most isolates growing in either a soil‐extract medium and or in a semisynthetic medium. Chromium is a hard, stiff, silver-white, smooth metal. The toxicity of Cr to soil bacterial isolates was studied by measuring turbidity of liquid cultures supplemented with Cr(VI) or Cr(III). The hexavalent chromium is toxic for agricultural plants at concentrations of about 0.5–5.0 mg mL −1 in the nutrient solution and 5–100 mg g −1 in the soil. Title Chromium stress in plants Author name S.K. Chromium is known to be a toxic metal that can cause severe In the past decades the increased use of chromium (Cr) in several anthropogenic activities and consequent contamination of soil and water have become an increasing concern. Leather tanning facilities, however, have not been viewed as sources of chromium Abstract: Chromium (Cr) is among the most widespread toxic trace elements found in agricultural soils due to various anthropogenic activities. Toxicity of Cr to plants depends on its valence state: Cr(VI) is highly toxic and mobile whereas Cr(III) is less toxic. Chromium can exist in its elemental form (chromium 0) as well as chromium III and chromium VI ‑ the Roman numerals denote the valency. Chromium toxicity in Sesbania sesban (L.) Merr R. Bakiyaraj, T. Mahakavi, L. Baskaran* Department of Botany, Annamalai University, Annamalai Nagar - 608 002, Tamil Nadu, India *E-mail address: ABSTRACT Chromium is one of the most common toxic metals present in the environment that induces various toxic effects in plants. 324 M. Lago-Vila et al. However, the role of micronutrient-amino chelates on reducing Cr toxicity in crop plants was recently introduced.