The role of thylakoid lipids in the photodamage of photosynthetic activity |
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Authors: | Prabhat Kumar Sharma Gauri S. Singhal |
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Affiliation: | Dept of Botany, Goa Univ., P. O. Bambolim, Goa 403 202, India;School of Life Sciences, Jawaharlal Nehru Univ., New Delhi 110 067, India. |
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Abstract: | The effect of excess light at 10 or 30°C under aerobic or low O2 condition on peroxidation of thylakoid lipids and primary photochemistry of photoinsynthesis was studied in wheat ( Triticum aestivum L. cv. HD 2329). Photoinhibitory damage to photosythesis was directly proportional to the peroxidation of thylakoid lipids. Photoinhibitory treatment given under low O2 conditions resulted in significantly less peroxidation of the primary photochemistry of photosythesis measured using chlorophyll fluorescence and photosythetic electron trasport. Short term recovery of Fv/Fm ratio was fast while thylakoid lipids did not show much recovry. However, recovery (of Fv/Fm ratio and thylakoid lipids) was almost complete within 12 h after photoinhibition treatment. A possible relationship between peroxidation of thylakoid lipids and photodamage to photosynthesis is discussed. |
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Keywords: | Chlorophyll fluorescence electron transport photoinhibition photoperoxidation recovery thylakoid lipids Triticum aestivum wheat |
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