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Acclimation of clusterbean cotyledon to UV-B radiation in the presence of UV-A: partial restoration of photosynthetic energy balance and redox homeostasis

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Abstract

The photosynthetic responses of clusterbean (Cyamopsis tetraganoloba) cotyledons exposed to UV-A, UV-B or UV-A + UV-B radiation for 1 h daily until day 10 have been compared. The loss in the rate of O2 evolution and CO2 assimilation (P n) are incommensurate with each other in both UV-A and UV-B exposed samples indicating the occurrence of loss in photostasis of photosynthesis by these two radiation bands. The alteration in redox status of Q A further suggests about a loss in redox homeostasis in the photosynthetic electron transport chain. However, both photochemical efficiency of PS II and P n are well maintained in UV-A + UV-B exposed cotyledons in spite of reduction in water-use efficiency. The acclimatization of clusterbean cotyledon to UV-B radiation in the presence of UV-A has been attributed to accumulation of flavonoids, increase in stomatal conductance (g s) and reduction in functional size of PS II.

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Acknowledgments

We thank Prof. U.C. Biswal for going through the manuscript and constructive suggestions. We also thank Dr. N.K. Ramaswamy (NABD, BARC, Mumbai) and Dr. R.K. Iyer (MBAD, BARC, Mumbai) for providing facilities to carry out TL studies. The work is supported by UGC, New Delhi, and DST, New Delhi.

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Authors and Affiliations

  1. Anchal College, Padampur, Rajborasambar, Bargarh, 768036, Odisha, India

    Padmanava Joshi, Sasmita Gartia, Manoj Kumar Pradhan, Srikanta Panigrahi & Lalitendu Nayak

  2. School of Life Sciences, Sambalpur University, Jyotivihar, Sambalpur, 768019, Odisha, India

    Sasmita Gartia & Basanti Biswal

Authors
  1. Padmanava Joshi
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  2. Sasmita Gartia
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  3. Manoj Kumar Pradhan
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  4. Srikanta Panigrahi
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  5. Lalitendu Nayak
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  6. Basanti Biswal
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Correspondence to Padmanava Joshi.

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Communicated by K. Trebacz.

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Joshi, P., Gartia, S., Pradhan, M.K. et al. Acclimation of clusterbean cotyledon to UV-B radiation in the presence of UV-A: partial restoration of photosynthetic energy balance and redox homeostasis. Acta Physiol Plant 35, 2323–2328 (2013). https://doi.org/10.1007/s11738-013-1245-6

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  • DOI: https://doi.org/10.1007/s11738-013-1245-6

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