Effects of diesel oil-polluted soil on emergence and growth of seedlings of Thespesia populnea (L.) Sol. Ex. Corr.
2009
Khan, D. (Government National Coll., Karachi (Pakistan). Dept. of Botany) | Shaukat, S.S. (Karachi Univ. (Pakistan). Inst. of Environmental Studies)
The effects of diesel oil pollution on Thespesia populnea (L.) Sol. Ex. Corr. were investigated in a series of artificially and freshly polluted sandy soil with 0, 0.5, 0.75, 1.0, 2.5, 4.0 and 5.0 mL diesel oil per 100g soil. Emergence of seedlings was impeded and germination losses occurred at high diesel oil concentrations. All the parameters of seedling growth viz. height, number of leaves, stem diameter, hypocotyl and epicotyls lengths, cotyledon area per seedling, area of the largest leaf, total leaf area per seedling and dry biomass of shoot, root and seedling declined progressively with increase of diesel oil concentration in the rhizosphere. Chlorophyll - a, b and total chlorophyll contents in fresh leaves declined significantly. Against control where around 10 internodes were produced, under diesel oil pollution only six or at the most seven internodes were produced. Diesel oil shortened the internodes.
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