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Morphological and Physiological Responses of Withania somnifera to Heavy metals Ni and Cd and UV B radiation

Shodhganga@INFLIBNET

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Title Morphological and Physiological Responses of Withania somnifera to Heavy metals Ni and Cd and UV B radiation
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Contributor John, Suchit A
 
Subject Botany
Withania somnifera
 
Description At present one of he major issues of potential environmental concern is the depletion of stratospheric concern is the depletion of stratospheric ozone layer, and the consequent increase in UV-B radiation reaching the Earth surface. UV-B radiation is energetically capable of disrupting proteins, nucleic acid and other important plant pigment. Several other studies indicated that supplemental UV-B radiation can deleteriously affect physiological process and overall growth in a number of plant species. Besides enhanced UV-B radiation, a great deal of interest has been generated to study the toxic effects of heavy metals on plants during recent years. Heavy metal pollution is increasing in the environment due to mining, industrializing, transportation, waste dumping and other anthropogenic activities. Airborne heavy metals fall upon, react with, and are absorbed by plants and soils near the sites of pollutant generation. A characteristic feature of toxicities due to heavy metal is chlorosis and reduction in net photosynthetic rate leading to decreased growth and productivity. Among heavy metal pollutants, nickel (Ni) and cadmium (Cd) needs special reference for their potential harmful effect on plants. Cd is established as a biotoxic heavy metal, which enters our environment mainly due to industrial activities, use of Cd containing phosphate fertilizers and sewage sludge in agriculture and abrasion of automobile tires. Ni is consider as essential micronutrient for plants, but is strongly phytotoxic at higher concentration. Ni is produced during production of stainless steel, storage batteries, spark plugs, magnets, machinery and due to use of sewage sludge. Burning of petroleum contributes the greatest emission of vanadium and nickel.
References p. 195-233
 
Date 2013-01-23T08:51:31Z
2013-01-23T08:51:31Z
2013-01-23
n.d.
03/03/2012
2012
 
Type Ph.D.
 
Identifier http://hdl.handle.net/10603/6634
 
Language English US
 
Relation --
 
Rights university
 
Format 233p.
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None
 
Coverage Botany
 
Publisher Allahabad
Sam Higginbottom Institute of Agriculture, Technology and Sciences
Department of Biological Sciences
 
Source INFLIBNET