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Senescence induced structural reorganization of thylakoid membranes in Cucumis sativus cotyledons; LHC II involvement in reorganization of thylakoid membranes

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Abstract

We report the formation and appearance of loosely stacked extended grana like structures along with plastoglobuli in the chloroplasts isolated from 27-day old senescing cucumber cotyledons. The origin and the nature of these extended grana structures have not been elucidated earlier. We isolated Photosystem I complexes from 6-day-old control and 27-day-old senescing cotyledons. The chlorophyll a/b ratio of the isolated Photosystem I complex obtained from 6-day cotyledons was 5–5.5 as against a ratio of 2.9 was found in Photosystem I complexes obtained from 27-day-old senescing cotyledons. We also found that the presence of LHC II in the Photosystem I complexes isolated from 27-day cotyledonary chloroplasts. The presence of LHC II in Photosystem I complexes in senescing and not in control samples, clearly suggest the detachment and diffusion of LHC II complexes from stacked grana region to Photosystem I enriched stroma lamellar region thereby, forming loose disorganized extended grana structures seen in the transmission electron microscope. Furthermore, we show that under in vitro condition the senescing cotyledon chloroplasts exhibited lower extent of light induced phosphorylation of LHC II than the control samples suggesting a possible irreversible phosphorylation and diffusion of LHC II in vivo during the progress of senescence in Cucumis cotyledons. From these findings, we suggest that the senescence induced phosphorylation of LHC II and its migration towards Photosystem I may be a programmed one some how causing the destruction of the thylakoid membrane. The released membrane components may be stored in the plastoglobuli prior to their mobilization to the younger plant parts.

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Authors and Affiliations

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

    J.S.S. Prakash & Prasanna Mohanty

  2. Department of Biochemistry, Jamia Hamdard, New Delhi, 110 062, India

    J.S.S. Prakash & M.A. Baig

  3. Center for Cellular and Molecular Biology, W-112, Uppal Road, Hyderabad, 500 007, Andhra Pradesh, India

    J.S.S. Prakash

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  1. J.S.S. Prakash
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  2. M.A. Baig
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  3. Prasanna Mohanty
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Prakash, J., Baig, M. & Mohanty, P. Senescence induced structural reorganization of thylakoid membranes in Cucumis sativus cotyledons; LHC II involvement in reorganization of thylakoid membranes. Photosynthesis Research 68, 153–161 (2001). https://doi.org/10.1023/A:1011876412537

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