skip to main content
Idioma:
Primo Search
Clear Search Box
Search in: Busca Geral
Busca Avançada
Busca por Índices

Chlorophyll Fluorescence and Organic Acid Oscillations during Transition from CAM to C3-photosynthesis inClusia minor L. (Clusiaceae)

de Mattos, Eduardo A. ; LÜttge, Ulrich

Annals of botany, 2001-09, Vol.88 (3), p.457-463 [Periódico revisado por pares]

Oxford: Elsevier Science Ltd

Texto completo disponível

Citações Citado por
  • Título:
    Chlorophyll Fluorescence and Organic Acid Oscillations during Transition from CAM to C3-photosynthesis inClusia minor L. (Clusiaceae)
  • Autor: de Mattos, Eduardo A. ; LÜttge, Ulrich
  • Assuntos: C3-photosynthesis ; CAM ; Clusia minor ; Gas exchange ; Gas exchange, organic acid, vacuoles, photoinhibition, C3-photosynthesis, CAM, Clusia minor ; organic acid ; photoinhibition ; vacuoles
  • É parte de: Annals of botany, 2001-09, Vol.88 (3), p.457-463
  • Notas: ark:/67375/HXZ-KQ97BSKW-Z
    Received: 31 January 2001 ; Returned for revision: 28 February 2001 . Accepted: 21 May 2001
    istex:43032664E91F9B1C0A6A2B6CE42122595A0ACC02
    local:880457
  • Descrição: In species of Clusia, switching from C3-photosynthesis (C3-PS) to crassulacean acid metabolism (CAM) may be a means of optimizing water use, plant carbon balance and photon utilization during periods of stress. We ask whether, in perennial species of Clusia, the switch from CAM back to C3-PS is also of ecophysiological significance. Our objective was to investigate the performance of C. minor L. during a short-term shift from CAM to C3-PS. During the transition from CAM to C3-PS, nocturnal malate and citrate accumulation decreased whereas CO2uptake increased during the daytime. However, after 7d, marked nocturnal accumulation of citrate and 24h CO2uptake occurred. In contrast to C3-like photosynthesis, a pronounced reduction in the effective quantum yield of photosystem II, ▵F/F′m, together with a sharp increase in non-photochemical quenching were observed during CAM at the beginning and end of the day. After 7d, integrated CO2uptake over 24h approximately doubled; however, water use efficiency was reduced three-fold due to increased rates of daytime transpiration. Despite very similar maximum ▵F/F′mbetween CAM and C3-PS, the results suggest that daily photon utilization increases when there is unrestricted CO2uptake directly from the atmosphere. Thus, under well-watered conditions and with increased rates of transpiration, C. minor performing C3-like photosynthesis may overcome the limitations of the storage capacity of the vacuole for overnight organic acid accumulation, improving its daily carbon balance.
  • Editor: Oxford: Elsevier Science Ltd
  • Idioma: Inglês
Voltar para lista de resultados

  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

Buscando em bases de dados remotas. Favor aguardar.