skip to main content

Lateral diffusion of CO 2 in leaves of the crassulacean acid metabolism plant Kalanchoë daigremontiana Hamet et Perrier

Duarte, Heitor ; Jakovljevic, Ivona ; Kaiser, Friedemann ; Lüttge, Ulrich

Planta, 2005, Vol.220(6), pp.809-816 [Periódico revisado por pares]

Texto completo disponível

Citações Citado por
  • Título:
    Lateral diffusion of CO 2 in leaves of the crassulacean acid metabolism plant Kalanchoë daigremontiana Hamet et Perrier
  • Autor: Duarte, Heitor ; Jakovljevic, Ivona ; Kaiser, Friedemann ; Lüttge, Ulrich
  • Assuntos: Chlorophyll fluorescence imaging ; CO-signalling ; Crassulacean acid metabolism ; Kalanchoë ; Leaf lateral CO diffusion ; Photosystem II activity
  • É parte de: Planta, 2005, Vol.220(6), pp.809-816
  • Descrição: Dynamic patchiness of photosystem II (PSII) activity in leaves of the crassulacean acid metabolism (CAM) plant Kalanchoë daigremontiana Hamet et Perrier, which was independent of stomatal control and was observed during both the day/night cycle and circadian endogenous oscillations of CAM, was previously explained by lateral CO 2 diffusion and CO 2 signalling in the leaves [Rascher et al. (2001) Proc Natl Acad Sci USA 98:11801–11805; Rascher and Lüttge (2002) Plant Biol 4:671–681]. The aim here was to actually demonstrate the importance of lateral CO 2 diffusion and its effects on localized PSII activity. Covering small sections of entire leaves with silicone grease was used for local exclusion of a contribution of atmospheric CO 2 to internal CO 2 via transport through stomata. A setup for combined measurement of gas exchange and chlorophyll fluorescence imaging was used for recording photosynthetic activity with a spatiotemporal resolution. When remobilization of malic acid from vacuolar storage and its decarboxylation in the CAM cycle caused increasing internal CO 2 concentrations sustaining high PSII activity behind closed stomata, PSII activity was also increased in adjacent leaf sections where vacuolar malic acid accumulation was minimal as a result of preventing external CO 2 supply due to leaf-surface greasing, and where therefore CO 2 could only be supplied by diffusion from the neighbouring malic acid-remobilizing leaf tissue. This demonstrates lateral CO 2 diffusion and its effect on local photosynthetic activity.
  • Idioma: Inglês

Buscando em bases de dados remotas. Favor aguardar.