Effect of cadmium on growth and the activity of H2O2 scavenging enzymes in Colocassia esculentum

Abstract

Cadmium is a non-essential heavy metal that can be harmful even at low concentrations to plants. Colocassia esculentum (Araceae) plant was studied to know its tolerance capability to cadmium. Colocassia esculentum plants grown in pots containing different concentrations of cadmium (Cd) were analyzed for dry matter, fresh weight and total metal content. Cadmium depressed dry matter production of the plant up to 33%. Plant accumulated larger portion of the heavy metal in the roots followed by stem and leaf. Chlorophyll content of the plant declined on treatment with heavy metal while the activity of antioxidative enzymes catalase and peroxidase increased. Colocassia esculentum also showed an increase in total protein along with greater A 250 /A 280 value suggesting an increase in metal protein complexes. Cadmium elicited anatomical changes in the root of C. esculentum. These changes under heavy metal stress indicate the adaptive properties of this plant species.Abbreviations: AAS -atomic absorption spectroscopy; DTPA-TEA -diethyltriamine penta acetic acidtriethanol amine; PVP -poly vinyl pyrrolidone

Antimony accumulation and antioxidative responses in four fern plants

“…2c-e). This was in agreement with previous reports of other plants treated with different metals/metalloids, such as As in Chinese brake fern (Cao et al 2004) and cadmium in duck weed (Spirodela polyrrhiza) (Assche & Clijsters 1990, Srivastava & Jaiswal 1990) and in Araceae (Colocassia esculentum) (Patel et al 2005). All the reports claim that increased activities of POD, CAT and APX were observed.…”

Phytoextraction of Cadmium from Contaminated Soil Assisted By Microbial Biopolymers

“…In 2004, one study in Japan estimated that an arable land area of 7327 hectares (0.16% of the total arable land) was polluted by heavy metals (Cd, Cu and/or As), in which cadmium contamination was observed across 92.6% of land [5]. Various in situ and ex situ remediation methods have been employed for restoration of soils contaminated with heavy metals, including physical/chemical/ biological techniques [6,7]. Phytoremediation has attracted much attention because it is environmental friendly and relatively cheap.…”

Cadmium stress-induced oxidative stress and role of nitric oxide in rice (Oryza sativa L.)

“…On the other hand, Brassica juncea, a metal accumulator, can develop superior antioxidative defense system (CAT, POX, SOD) to adapt to the oxidative stress (due to ROS generation) induced by Cd toxicity (Wang et al 2008). Besides, the other plant systems which were studied to investigate Cd stress are: Allium sativum (Liu and Kottke 2005), Hordeum vulgare (Finkemeier et al 2003), Cannabis sativa (Linger et al 2005), Colocassia esculentum (Patel et al 2005), Triticum aestivum (Khan et al 2007), Arabidopsis thaliana (Smeets et al 2008), Lactuca sativa (Cornu et al 2008), Nicotiana tabacum (Wang et al 2008, Solanum lycopersicon (Chamseddine et al 2008), Sorghum bicolor (Kuriakose Saritha and Prasad 2008), soybean (Luan et al 2008;Shamsii et al 2008), Vigna mungo (Molina et al 2008), Zea mays (Kumar et al 2008), etc. NO, already mentioned above as a free radical, is involved in diverse physiological processes in plants (Lamattina et al 2003). It has also been proved that NO is functional metabolite in plants (Neill et al 2002).…”