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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, 8/2015, Vol.29(4), pp.1029-1040 [Periódico revisado por pares]

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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: Photosynthesis – Physiological Aspects ; Photosynthesis – Analysis ; Plant Biochemistry – Physiological Aspects ; Plant Biochemistry – Analysis ; Chlorophyll – Physiological Aspects ; Chlorophyll – Analysis ; Resveratrol – Physiological Aspects ; Resveratrol – Analysis
  • É parte de: Trees, 8/2015, Vol.29(4), pp.1029-1040
  • Descrição: To access, purchase, authenticate, or subscribe to the full-text of this article, please visit this link: Byline: Maciej Kocurek (1), Andrzej Kornas (2), Jan Pilarski (1), Krzysztof Tokarz (3,4), Ulrich Luttge (5), Zbigniew Miszalski (3,6) Keywords: [beta]-Carboxylation; Citrate; 13.sup.C discrimination; Malate; Corticular photosynthesis; Stems Abstract: Key message In stems of Clusia, CO .sub.2 concentrated in the xylem sap in CAM trees can be fixed by PEPC and Rubisco, while in C .sub.3 trees only Rubisco is engaged. Abstract 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.sub.3 and Clusia rosea Jacq. as an obligate CAM plant. Photosynthetic gas exchange, xylem CO.sub.2 concentration, chlorophyll distribution, 13.sup.C discrimination, daily malate and citrate fluctuations and the abundance of Rubisco (ribulose-1,5-bisphosphate carboxylase/oxygenase) and PEPC (phosphoenolpyruvate carboxylase) proteins were measured in leaves and stems. In stems of both species a low CO.sub.2 efflux (in the range of 0.05--0.1 A[micro]mol m.sup.-2 s.sup.-1) was observed as a result of extremely low cork conductance for water vapor (0.15--0.2 mmol m.sup.-2 s.sup.-1). This led to the CO.sub.2 concentration in xylem sap reaching 5.2 (CO.sub.2*) mmol l.sup.-1. The substantial amount of chlorophyll in the outer part of the bark and light-induced decrease of CO.sub.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.sup.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. Author Affiliation: (1) Institute of Biology, Jan Kochanowski University, ul. AwiAtokrzyska 15, 25-406, Kielce, Poland (2) Institute of Biology, Pedagogical University, ul. PodchorAA1/4ych 2, 30-084, Krakow, Poland (3) The Franciszek Gorski Institute of Plant Physiology of the Polish Academy of Sciences, ul. Niezapominajek 21, 30-239, Krakow, Poland (4) Institute of Plant Biology and Biotechnology, Unit of Botany and Plant Physiology, al. 29 Listopada 54, 31-425, Krakow, Poland (5) Department of Biology, Technical University Darmstadt, Schnittspahnstra[sz]e 3-5, 64287, Darmstadt, Germany (6) Malopolska Center of Biotechnology, Jagiellonian University, ul. Gronostajowa 7A, 30-387, Krakow, Poland Article History: Registration Date: 04/03/2015 Received Date: 24/11/2014 Accepted Date: 27/02/2015 Online Date: 13/03/2015 Article note: Communicated by H. Pfanz.
  • Idioma: Inglês

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