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    • Expression of 5-amino levulinic acid induced photodynamic damage to the thylakoid membranes in dark sensitized by brief pre-illumination

      N Chakraborty B C Tripathy

      Volume 15 Issue 3 September 1990 pp 199-204

    • Fulltext

       

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/jbsc/015/03/0199-0204

    • Keywords

       

      5-Amino levulinic acid; thylakoid membrane; photosystem

    • Abstract

       

      The 5-amino levulinic acid treated cucumber (Cucumis sativus L., CV. Pointsette) plants upon exposure to light (≃30,000 lux) wilted within 6 h and died after 36 h due to photodynamic reactions. Thylakoid membranes, the site of accumulation of porphyrins, were damaged due to photodynamic reactions leading to the inhibition of membrane linked functions of photosystem II, photosystem I and the whole chain electron transport. Photosystem II was more susceptible to photodynamic damage than photosystem I. The exogenous electron donors Mn2+, diphenyl carbazide and NH2OH failed to donate electrons to photosystem II suggesting that the damage has taken place close to P680. The 5-amino levulinic acid treated plants exposed to 30 min of light did not show any damage to the thylakoid membranes. However, when the above plants were transferred to dark for 12 h there was substantial damage to the thylakoid membrane system.

    • Author Affiliations

       

      N Chakraborty1 B C Tripathy1

      1. School of Life Sciences, Jawaharlal Nehru University, New Delhi - 110 067, India

    • Dates

       
      Published
      September 1990

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