Thermoluminescence studies on the function of photosystem II in the desiccation tolerant lichen Cladonia convoluta

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Abstract

The effect of desiccation and rehydration on the function of Photosystem II has been studied in the desiccation tolerant lichen Cladonia convoluta by thermoluminescence. We have shown that in functional fully hydrated thalli thermoluminescence signals can be observed from the recombination of the S(2(3))Q(B)/- (B band), S2Q(A)/- (Q band), Tyr- D+Q(A)/- (C band) and Tyr-Z+(His+)Q(A)/- (A band) charge stabilization states. These thermoluminescence signals are completely absent in desiccated thalli, but rapidly reappear on rehydration. Flash-induced oscillation in the amplitude of the thermoluminescence band from the S(2(3))Q(B)/- recombination shows the usual pattern with maxima after 2 and 6 flashes when rehydration takes place in light. However, after rehydration in complete darkness, there is no thermoluminescence emission after the 1st flash, and the maxima of the subsequent oscillation are shifted to the 3rd and 7th flashes. It is concluded that desiccation of Cladonia convoluta converts PS II into a nonfunctional state. This state is characterized by the lack of stable charge separation and recombination, as well as by a one-electron reduction of the water-oxidizing complex. Restoration of PS II function during rehydration can proceed both in the light and in darkness. After rehydration in the dark, the first charge separation act is utilized in restoring the usual oxidation state of the water-oxidizing complex.

Original languageEnglish
Pages (from-to)205-212
Number of pages8
JournalPhotosynthesis Research
Volume48
Issue number1-2
Publication statusPublished - 1996

Fingerprint

Cladonia
Desiccation
Lichens
Thermoluminescence
Photosystem II Protein Complex
Fluid Therapy
rehydration
desiccation (plant physiology)
photosystem II
lichens
Genetic Recombination
Darkness
thallus
oscillation
Water
Light
Restoration
Stabilization
thermoluminescence
water

Keywords

  • desiccation tolerance
  • lichen
  • Photosystem II
  • thermoluminescence

ASJC Scopus subject areas

  • Plant Science

Cite this

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title = "Thermoluminescence studies on the function of photosystem II in the desiccation tolerant lichen Cladonia convoluta",
abstract = "The effect of desiccation and rehydration on the function of Photosystem II has been studied in the desiccation tolerant lichen Cladonia convoluta by thermoluminescence. We have shown that in functional fully hydrated thalli thermoluminescence signals can be observed from the recombination of the S(2(3))Q(B)/- (B band), S2Q(A)/- (Q band), Tyr- D+Q(A)/- (C band) and Tyr-Z+(His+)Q(A)/- (A band) charge stabilization states. These thermoluminescence signals are completely absent in desiccated thalli, but rapidly reappear on rehydration. Flash-induced oscillation in the amplitude of the thermoluminescence band from the S(2(3))Q(B)/- recombination shows the usual pattern with maxima after 2 and 6 flashes when rehydration takes place in light. However, after rehydration in complete darkness, there is no thermoluminescence emission after the 1st flash, and the maxima of the subsequent oscillation are shifted to the 3rd and 7th flashes. It is concluded that desiccation of Cladonia convoluta converts PS II into a nonfunctional state. This state is characterized by the lack of stable charge separation and recombination, as well as by a one-electron reduction of the water-oxidizing complex. Restoration of PS II function during rehydration can proceed both in the light and in darkness. After rehydration in the dark, the first charge separation act is utilized in restoring the usual oxidation state of the water-oxidizing complex.",
keywords = "desiccation tolerance, lichen, Photosystem II, thermoluminescence",
author = "L. Sass and Z. Csintalan and Z. Tuba and I. Vass",
year = "1996",
language = "English",
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journal = "Photosynthesis Research",
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T1 - Thermoluminescence studies on the function of photosystem II in the desiccation tolerant lichen Cladonia convoluta

AU - Sass, L.

AU - Csintalan, Z.

AU - Tuba, Z.

AU - Vass, I.

PY - 1996

Y1 - 1996

N2 - The effect of desiccation and rehydration on the function of Photosystem II has been studied in the desiccation tolerant lichen Cladonia convoluta by thermoluminescence. We have shown that in functional fully hydrated thalli thermoluminescence signals can be observed from the recombination of the S(2(3))Q(B)/- (B band), S2Q(A)/- (Q band), Tyr- D+Q(A)/- (C band) and Tyr-Z+(His+)Q(A)/- (A band) charge stabilization states. These thermoluminescence signals are completely absent in desiccated thalli, but rapidly reappear on rehydration. Flash-induced oscillation in the amplitude of the thermoluminescence band from the S(2(3))Q(B)/- recombination shows the usual pattern with maxima after 2 and 6 flashes when rehydration takes place in light. However, after rehydration in complete darkness, there is no thermoluminescence emission after the 1st flash, and the maxima of the subsequent oscillation are shifted to the 3rd and 7th flashes. It is concluded that desiccation of Cladonia convoluta converts PS II into a nonfunctional state. This state is characterized by the lack of stable charge separation and recombination, as well as by a one-electron reduction of the water-oxidizing complex. Restoration of PS II function during rehydration can proceed both in the light and in darkness. After rehydration in the dark, the first charge separation act is utilized in restoring the usual oxidation state of the water-oxidizing complex.

AB - The effect of desiccation and rehydration on the function of Photosystem II has been studied in the desiccation tolerant lichen Cladonia convoluta by thermoluminescence. We have shown that in functional fully hydrated thalli thermoluminescence signals can be observed from the recombination of the S(2(3))Q(B)/- (B band), S2Q(A)/- (Q band), Tyr- D+Q(A)/- (C band) and Tyr-Z+(His+)Q(A)/- (A band) charge stabilization states. These thermoluminescence signals are completely absent in desiccated thalli, but rapidly reappear on rehydration. Flash-induced oscillation in the amplitude of the thermoluminescence band from the S(2(3))Q(B)/- recombination shows the usual pattern with maxima after 2 and 6 flashes when rehydration takes place in light. However, after rehydration in complete darkness, there is no thermoluminescence emission after the 1st flash, and the maxima of the subsequent oscillation are shifted to the 3rd and 7th flashes. It is concluded that desiccation of Cladonia convoluta converts PS II into a nonfunctional state. This state is characterized by the lack of stable charge separation and recombination, as well as by a one-electron reduction of the water-oxidizing complex. Restoration of PS II function during rehydration can proceed both in the light and in darkness. After rehydration in the dark, the first charge separation act is utilized in restoring the usual oxidation state of the water-oxidizing complex.

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