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Comparative measurements of chlorophyll a fluorescence, acid accumulation and gas exchange in exposed and shaded plants of Clusia minor L. and Clusia multiflora H. B. K. in the field

Grams, T. E. E. ; Haag-Kerwer, A. ; Olivares, Elizabeth ; Ball, Erika ; Arndt, Stefan ; Popp, Marianne ; Medina, Ernesto ; Lüttge, Ulrich

Trees, 1997, Vol.11(4), pp.240-247 [Periódico revisado por pares]

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  • Título:
    Comparative measurements of chlorophyll a fluorescence, acid accumulation and gas exchange in exposed and shaded plants of Clusia minor L. and Clusia multiflora H. B. K. in the field
  • Autor: Grams, T. E. E. ; Haag-Kerwer, A. ; Olivares, Elizabeth ; Ball, Erika ; Arndt, Stefan ; Popp, Marianne ; Medina, Ernesto ; Lüttge, Ulrich
  • Assuntos: Key words Chlorophyll a fluorescence ; Clusia ; Crassulacean acid metabolism (CAM) ; Electron transport rate through photosystem II ; Malate decarboxylation
  • É parte de: Trees, 1997, Vol.11(4), pp.240-247
  • Descrição:  Changes in chlorophyll a fluorescence during the day and diurnal-changes of net CO 2 -exchange and organic acid contents were determined in two species of the genus Clusia during the dry season in Venezuela. The investigations included plants of the C 3 /CAM intermediate species Clusia minor and the C 3 species C. multiflora growing at exposed and shaded sites. Both species showed a C 3 pattern of net CO 2 -exchange at the exposed site. In the shade under extreme drought stress C. minor showed a weak expression of CAM without CO 2 -uptake during the afternoon (phase IV of CAM). C. multiflora growing in the shade exhibited a C 3 -pattern of net CO 2 -exchange and a small but significant nocturnal accumulation of citrate. Shaded plants of C. minor were able to double their light utilisation for electron transport and to reduce non-photochemical quenching during phase III compared to phase II of CAM. Furthermore, increase of electron transport rate through photosystem II in phase III of CAM is correlated to decarboxylation of malate. At the exposed site C. multiflora was less negatively affected by high PPFD than C. minor . This was shown by a lower reduction of potential electron quantum yield (F v /F m ) and higher light utilisation of electron transport of C. multiflora compared to C. minor . At the exposed site C. minor did not make use of the CAM option to increase light utilisation of electron transport and to reduce non-photochemical quenching as did the plants growing in the shade.
  • Idioma: Inglês

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