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Differential cadmium stress tolerance in wheat genotypes under mycorrhizal association

Sharma, Vinay, Parmar, Pooja, Kumari, Nilima
Journal of plant nutrition 2016 v.39 no.14 pp. 2025-2036
abiotic stress, antioxidant activity, ascorbate peroxidase, cadmium, calcium, catalase, embryophytes, fungi, genotype, glutathione-disulfide reductase, heavy metals, iron, lipid peroxidation, nutrient content, plant growth, soil, stress tolerance, superoxide dismutase, synergism, vesicular arbuscular mycorrhizae, wheat, zinc
Arbuscular mycorrhizal (AM) fungi display efficient association with the land plants and is known to protect plants against various abiotic stresses including heavy metal stress. This work reports the synergistic effects of natural genotypic variation and AM association in cadmium (Cd) stress alleviation. Two genotypes of wheat viz. RAJ 4161 (resistant) and PBW 343 (sensitive) were subjected to different concentrations of Cd (0, 100, 200 and 300 mg Cd kg ⁻¹ soil) for 30 days. Cd application resulted in increased lipid peroxidation and decreased plant growth. However, AM inoculated RAJ 4161 displayed significantly higher ascorbate peroxidase (APX), catalase (CAT), glutathione reductase (GR) and superoxide dismutase (SOD) activity and calcium (Ca), iron (Fe)and zinc (Zn) concentration in plants. The coordination of increased antioxidant activity and high nutrient content in RAJ 4161 indicated better protective mechanism as compared to PBW 343.