I= INVERSTIGATION INTO THE EFFECTS OF AUTOMOBILE POLLUTANTS ON GROWTH AND METAL CONTENTS OF SOME ROADSIDE PLANTS
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Title of Thesis
INVERSTIGATION INTO THE EFFECTS OF AUTOMOBILE POLLUTANTS ON GROWTH AND METAL CONTENTS OF SOME ROADSIDE PLANTS

Author(s)
Muhammad Shafiq
Institute/University/Department Details
University Of Karachi/ Department Of Botany
Session
2002
Subject
Botany
Number of Pages
99
Keywords (Extracted from title, table of contents and abstract of thesis)
automobile, pollutants, roadside, plants, growth of plants, seed germination, metal accumulation, autoemission, toxic

Abstract
The phenology of Astonia scholaris, Pongamia pinnata, Cassia siamea and peltophorum pterocarpum was significantly (p<0.05) affected in the Karachi city polluted environment. Plants were more affected to pollutants at Gulshan-e-Iqbal, Nazimabad, Shahrah-e-Faisal and M.A Jinnah Roadm as compared to Karachi University Campus. Leaf length, width and area of A. Scholaris were found lowest in summer at M.A Jinnah Road, as compared to Shahrah-e-Faisal, Nazimabad, Gulshan-e-Iqbal and Karachi University Campus, respectively. Leaf length and area of P. pinnata were Significantly (p<0.05) reduced in autumn at the highly polluted sites of M.A Jinnah Road as compared to Karachi University Campus. Leaf width and area of C.siamea were significantly (P<0.05) reduced in autumn at the highly polluted sites of M.A Jinnah Road, as compared to Karachi University Campus. Leaf length of P. pterocarpum was also found significantly (P<0.05) reduced at M.A Jannah Road in winter as compared to other less polluted sites of the city.

Autoemission showed toxic effect on seed germination and seedling growth of plants. The seeds of P.Ptercarpum and C. siamea collected from the trees growing along the busy roads of the city showed low percentage of germination. Seedling dry weight of the plants also decreased significantly (P0.05). In pot experiments, the seed germination and seedling growth of C. siamea was badly affected in seeds collected from the polluted areas of the city as compared to Karachi University Campus.

Lead and cadmium treatment produced toxic effects on seed germination and seedling growth of Peltophorum pterocarpum and Leucaenal leucocephala. Root length of L leucocephala and P. pterocarpum was significantly (P<0.05) reduced at 50 ppm treatment of lead. The treatment of Pb at 25 ppm suppressed the seedling dry weight of P. pterocarpum. Cadmium treatment of 50 ppm produced significant (p<0.05) effects on seed germination of L. leucocephala as compared to control. The seed germination, seedling length and dry weight of C. siamea were significantly affected by 25 ppm cadmium treatments as compared to control.

The trees of all species (A. scholaris, P. siamea and P. pterocarpum) growing along the busy roads of the city showed significantly higher concentration of Pb and Cd. The concentration of Pb and Cd in leaves of all the species was quite high at M.A Jinnah Road as compared to Shahrah-e-Faisal, Nizamabad, Gulshan-e-Iqbal and Karachi University Campus. Higher level of Pb and Cd in leaves of A. scholaris and P. pinnata might be due to the large surface area that is available for exposure to any pollutant as compared to any pollutant as compared to C siamea and P. pterocarpum. Low vehicular traffic activities at the campus showed lowest Pb and Cd contents for all the tree species investigated.

In this study, pletophorum pterocarpum was found affected to automobile pollution of the city as compared to other species. It is therefore suggested that P. pterocarpum shuld be given more preference for future plantation in the city areas, particularly along the roads.

Download Full Thesis
1004.79 KB
S. No. Chapter Title of the Chapters Page Size (KB)
1 0 Contents
94.26 KB
2 1 Abstract
23.59 KB
3 2 Introduction 3
39.63 KB
4 3 Review Of Literature
104.27 KB
  Effects Of Autoemission On Growth Of Plants 7
  3.2 Effects Of Autoemission On Seed Germination And Seedling Trowth 8
  3.3 Effects Of Lead And Cadmium On Seed Germination And Growth Plants 9
  3.4 Heavy Metal Accumulation In Plants Soil And Atmosphere 12
5 4 Materials And Methods
405.36 KB
  4.1 Sites Description 20
  4.2 Selection Of Sites 21
  4.3 Collection Of Seeds And Leaf Samples 22
  4.4 Seed Germination Studies 24
  4.5 Effects Of Lead And Cadmium On Seed Germination 25
  4.6 Analysis Of Lead And Cadmium In Leaf Samples Equipment 27
6 5 Results
233.61 KB
  5.1 Effects Of Autoemissin On Leaves Of Plants 40
  5.2 Effects Of Autoemissin On Seed Germination And Seedling Growth 46
  5.3 Effects Of Lead And Cadmium On Seed Germination And Seedling Growth 52
  5.4 Lead And Cadmium In The Foliage Of Different Plants 67
7 6 Discussion 72
111.6 KB
8 7 References 85
117.1 KB
9 8 List Of Papers Published 97
28.81 KB