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Photosynthetic electron transport and carbon-reduction-cycle enzyme activities under long-term drought stress in Casuarina equisetifolia Forst. & Forst.

Photosynthesis Research volume 52, pages 255–262 (1997)Cite this article

Abstract

The inhibition of photosynthetic electron transport and the activity of photosynthetic carbon reduction cycle (PCR) enzymes under long-term water stress after slow dehydration was studied in non-nodulated Casuarina equisetifolia Forst. & Forst. plants. Initially, drought increased the fraction of closed Photosystem II (PS II) reaction centres (lowered qP) and decreased the quantum yield of PS II electron transport (ΦPSII) with no enhancement of non-radiative dissipation of light energy (qN) because it increased the efficiency of electron capture by open PS II centres (F′v/F′m). As drought progressed, F′v/F′m fell and the decrease in ΦPSII was associated with an increased qN. The kinetics of dark relaxation of fluorescence quenching pointed to an increase in a slowly-relaxing component under drought, in association with increased contents of zeaxanthin and antheraxanthin. Total NADP-dependent malate dehydrogenase activity increased and total stromal fructose-1,6-bisphosphatase activity decreased under drought, while the activation state of these enzymes remained unchanged. Water stress did not alter the activity and the activation state of ribulose bisphosphate carboxylase oxygenase.

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Authors and Affiliations

  1. Instituto de Recursos Naturales y Agrobiología de Salamanca, CSIC. Apartado 257, E-37071, Salamanca, Spain

    J. Sánchez-Rodriguez, R. Martínez-Carrasco & P. Pérez

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  1. J. Sánchez-Rodriguez
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  2. R. Martínez-Carrasco
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  3. P. Pérez
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Sánchez-Rodriguez, J., Martínez-Carrasco, R. & Pérez, P. Photosynthetic electron transport and carbon-reduction-cycle enzyme activities under long-term drought stress in Casuarina equisetifolia Forst. & Forst.. Photosynthesis Research 52, 255–262 (1997). https://doi.org/10.1023/A:1005878307607

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  • DOI: https://doi.org/10.1023/A:1005878307607

  • chlorophyll fluorescence
  • fructose bisphosphatase
  • NADP-malate dehydrogenase
  • Photosystem II
  • ribulose bisphosphate carboxylase
  • water stress

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