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Vegetos

Journal: Vegetos- An International Journal of Plant Research

Article DOI :10.5958/2229-4473.2014.00040.8
Year :2014, Volume : 27, Issue :2
First page : (245) Last page : (247)
Print ISSN : 0970-4078. Online ISSN : 2229-4473.


RESEARCH ARTICLE
A SOCIETY FOR PLANT RESEARCH PUBLICATION

Inhibition of Photosynthetic Electron Transport Activities in Maize Seedlings by Treatment with Toxic Concentrations of Zinc

Adam S, Murthy S D S*

Department of Biochemsitry, SRI Venkateswara University, Tirupati-517502, A.P., India

*Corresponding author Email: sdsmurthy@rediffmail.com

The effect of zinc at high concentration (60–180μM) has been investigated in maize seedlings in controlled environment. Zinc treatment caused inhibition in whole chain electron transport and Photosystem (PS) -II catalyzed electron transport by 48% at 120 μM concentration. Further rise to 180 μM concentration caused damage and inhibited PS-II activity. But at the same concentration, 29% loss was noted in PS-I catalyzed electron transport activity. Light intensity alterations clearly demonstrate that the inhibition was at light saturating conditions (416Wm−2) rather than the light limiting conditions (24Wm−2) which concludes that LHC-II of PS-II is the main target for zinc stress.




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