PJB-2021-631
Short term Kinetics of growth and lead accumulation in Maiz (Zea Mays) under lead Toxicity
habibakanwal
Abstract
In this study an attempt was made to determine the accumulation of Pb in maize shoot and root parts and toxicity of Pb to growth of maize. The results showed that application of increased level of Pb resulted in a substantial reduction in length, fresh and dry weight of shoot and root together with substantial reduction in root and shoot water contents in both hybrids. Under control conditions both hybrids indicated much enhanced leaf area, which was markedly reduced under Pb stress and hybrid Ev-22 was more affected as compare to hybrid Sargodha. The determination of shoot carbohydrates and free amino acids revealed that an increasing trend in both control and Pb stresses their accumulation was much lesser under Pb toxicity. Both hybrids indicated that lead stress was highly effective in reducing tissue contents over time and there was a linear tissue accumulation of Pb in shoot and root of both hybrids although hybrid Sargodha accumulated relatively lesser Pb in both parts. To ascertain the possible association of these ions with the Pb uptake the ration of potassium, lead and Ca-Pb in both parts of hybrids were declining over time. The accumulation of greater potassium and calcium in shoot and root over time is a likely reason for Pb tolerance. In conclusion, Pb is highly toxic to maize growth and development because some differences exist in both maize hybrids for tolerance to the Pb toxicity. The Sargodha hybrid of maize was more stable in growth than Hybrid Ev-22 under lead toxicity.
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