PJB-2020-197
EFFECTS OF ARBUSCULAR MYCORRHIZAL ASSOCIATION ON TOLERANCE ABILITY OF TWO PEARL MILLET GENOTYPES UNDER SALT STRESS
IWUALA EMMANUEL
Abstract
The symbiotic association between the plant roots and arbuscular mycorrhiza (AM) is an important ecological adaptation. This association protects many plant species under several environmental stresses, including salt and heavy metal stress. This work aims to recognize the synergistic effect of AM association with roots of two pearl millet genotypes up to seedlings stage under a simulated condition of salt (NaCl) stress. Two pearl millet genotypes viz., IP13146 and IP12520 were grown for 28 days and afterwards treated with varying concentrations of NaCl solution (ranging 0-100-200 mM). NaCl application showed significant increase in malondialdehyde content along with a reduction in plant biomass in non-inoculated AM genotype IP12520. While the genotype IP13146, inoculated with AM showed a significant higher activities of ascorbate peroxidase, superoxide dismutase, catalase along with an increase in zinc (Zn) and cadmium (Cd) concentrations. The synergistic association was found instrumental in increasing the high content of heavy metal and antioxidant activity, hence, suggested that genotype IP13146 has a better protective defense mechanism than the IP12520, and should be investigated further for its utility in future breeding and transgenic development programmes.
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