Morphological and Physiological Responses of Morning Glory ( Ipomoea lacunosa L.) Grown in a Lead- and Chelate-Amended Soil

Murty S. Kambhampati, Gregorio B. Begonia, Maria F. T. Begonia and Yolanda Bufford
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Murty S. Kambhampati: Department of Biology, Southern University at New Orleans, New Orleans, LA 70126, USA
Gregorio B. Begonia: Department of Biology, Jackson State University, Jackson, MS 39217, USA
Maria F. T. Begonia: Department of Biology, Jackson State University, Jackson, MS 39217, USA
Yolanda Bufford: Department of Biology, Jackson State University, Jackson, MS 39217, USA

IJERPH, 2005, vol. 2, issue 2, 1-5

Abstract: Lead (Pb) is one of the most toxic metals in the environment and may cause drastic morphological and physiological deformities in Ipomoea lacunosa . The goal of this research was to evaluate some morphological and physiological responses of morning glory grown on a Pb- and chelate-amended soil. Soil samples were analyzed, at Mississippi State University Soil Laboratory, for physico-chemical parameters, such as soil texture (73% sand, 23% silt, 4.4% clay), organic matter (6.24 ± 0.60%), and pH (7.95 ± 0.03), to establish soil conditions at the beginning of the experiments. Five EDTA (ethylenediaminetetraacetic acid) concentrations (0, 0.1, 0.5, 1, 5mM) and four lead (0, 500, 1000, 2000mg/L) treatments were arranged in factorial in a Randomized Complete Block (RCB) design with five replications. Duncan’s multiple comparison range test showed that the mean difference values of stomatal density were significant between 500 and 1000mg/L Pb and between 1000 and 2000mg/L Pb. Two way ANOVA (at 1% level) indicated that interaction between Pb and EDTA had a significant effect on the stomatal density and photosynthetic rates, and at 5% level Pb had a significant effect on chlorophyll concentrations. Lowest concentrations of chlorophyll were recorded at 2000mg/L Pb and 5mM EDTA and exhibited a decreasing trend specifically in the ranges of 1000 and 2000mg/L Pb and 1.0 and 5.0mM EDTA. Duncan’s multiple comparison range test confirmed that mean differences between the control treatment vs. 2000mg/L Pb, and 500mg/L vs. 2000mg/L Pb were significantly different at p>0.05. There was a decrease in leaf net photosynthetic rate with increasing concentrations of Pb from 0 to 2000mg/L. In conclusion, I. lacunosa L. plants were grown to maturity in all treatments with no significant and/or apparent morphological disorders, which indicated that this species might be highly tolerant even at 2000mg/L Pb concentrations in the soil.

Keywords: Lead; EDTA; phytoremediation; chlorophyll; stomata; photosynthesis; soil (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2005
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