HEAVY METAL TRANSPORT IN ZEA MAYS WITH REFERENCE TO MYCORRHIZAL COLONISATIONS, SENTHILKUMAR, D. I. AROCKIASAMY, S. JOHNBRITTO AND M. SATHYANATHAN
Zea mays seedings were inoculated with Glomus ,nosseae and heavy metal stress was induced with zinc sulphate at 50, 75 and 100 mM concentrations after ensuring the colonisation of fungus. Zinc content was estimated both in leave and roots of infected and non infected seedlings. 30% of the heavy metal accumulation was found in the roots and about 70% in the leaves in both 75 and 100 mM in the absence of VAM, whereas in the VAM colonised seedlings about 5-17% was accumulated in the leaves and 83- 95% in the roots which point out to the retention of the absorbed heavy metal in the roots. The zinc content was found to be 0.26 and 0.216 mg/g d. wt. in non infected and infected seedlings which indicates the ti pt k e was not altered by the VAM but plays an important role in the transport. The present study indicates that synthesis of newer proteins that could bind the heavy metal and retain in the root may be one of the possible mechanisms of heavy metal resistance due to the presence of VAM fungi.
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