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Photosynthetic activity of stems in two Clusia species

Kocurek, Maciej ; Kornas, Andrzej ; Pilarski, Jan ; Tokarz, Krzysztof ; Lüttge, Ulrich ; Miszalski, Zbigniew

Trees (Berlin, West), 2015-08, Vol.29 (4), p.1029-1040 [Periódico revisado por pares]

Berlin/Heidelberg: Springer Berlin Heidelberg

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  • Título:
    Photosynthetic activity of stems in two Clusia species
  • Autor: Kocurek, Maciej ; Kornas, Andrzej ; Pilarski, Jan ; Tokarz, Krzysztof ; Lüttge, Ulrich ; Miszalski, Zbigniew
  • Assuntos: Agriculture ; Biomedical and Life Sciences ; Forestry ; Life Sciences ; Original Paper ; Plant Anatomy/Development ; Plant Pathology ; Plant Physiology ; Plant Sciences
  • É parte de: Trees (Berlin, West), 2015-08, Vol.29 (4), p.1029-1040
  • Descrição: Key message In stems of Clusia, CO 2 concentrated in the xylem sap in CAM trees can be fixed by PEPC and Rubisco, while in C 3 trees only Rubisco is engaged. The photosynthetic characteristics of 7–8-year-old stems of two tropical trees representing the Clusiaceae family were compared: Clusia multiflora Kunth. described as an obligate C 3 and Clusia rosea Jacq. as an obligate CAM plant. Photosynthetic gas exchange, xylem CO 2 concentration, chlorophyll distribution, 13 C discrimination, daily malate and citrate fluctuations and the abundance of Rubisco (ribulose-1,5-bisphosphate carboxylase/oxygenase) and PEPC (phospho enol pyruvate carboxylase) proteins were measured in leaves and stems. In stems of both species a low CO 2 efflux (in the range of 0.05–0.1 µmol m −2  s −1 ) was observed as a result of extremely low cork conductance for water vapor (0.15–0.2 mmol m −2  s −1 ). This led to the CO 2 concentration in xylem sap reaching 5.2 (CO 2 *) mmol l −1 . The substantial amount of chlorophyll in the outer part of the bark and light-induced decrease of CO 2 concentration within the xylem can be explained by photosynthetic activity in this tissue. Moreover, Western blotting analyses proved the presence of Rubisco in the stems of both Clusia species; however, PEPC was only found in C. rosea . Additionally, daily fluctuations in the concentration of citrate and malate (higher than in leaves) and significant enrichment in 13 C in C. rosea stems were observed. These facts allow us to conclude that the examined stems of C. rosea and C. multiflora represent specific types of photosynthetic metabolism.
  • Editor: Berlin/Heidelberg: Springer Berlin Heidelberg
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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