Počet záznamů: 1

Photosynthetic induction in broadleaved Fagus sylvatica and coniferous Picea abies cultivated under ambient and elevated CO2 concentrations

  1. 1.
    0333853 - UEK-B 2010 RIV CZ eng J - Článek v odborném periodiku
    Košvancová, Martina - Urban, Otmar - Šprtová, Miroslava - Hrstka, M. - Kalina, J. - Tomášková, Ivana - Špunda, V. - Marek, Michal V.
    Photosynthetic induction in broadleaved Fagus sylvatica and coniferous Picea abies cultivated under ambient and elevated CO2 concentrations.
    Plant Protection Science. Roč. 177, - (2009), s. 123-130 ISSN 1212-2580
    Grant CEP: GA MŠk OC08022; GA AV ČR IAA600870701
    Výzkumný záměr: CEZ:AV0Z60870520
    Klíčová slova: gas exchange * photosynthetic limitations * photosynthetic down-regulation * Rubisco specific activity * stomatal conductance
    Kód oboru RIV: ED - Fyziologie

    The hypothesis that elevated CO2 leads to a faster induction of photosynthesis was tested using seedlings of Fagus sylvatica and Picea abies exposed to ambient (385 ppm; AC) and elevated CO2 (700 ppm; EC). The presumptions were: EC (1) reduces the content of Rubisco in leaves, (2) decreases stomatal conductance, and (3) has no effect on the rates of stomatal opening and Rubisco activation upon illumination. Reductions of Rubisco and light-saturated stomatal conductance were observed in both EC treated tree species; however, the presumption of constant induction rates was not confirmed. Thus, EC treatment led to the stimulation of the initial phase of induction demonstrated by the higher induction state 60s after leaf illumination. In contrast, the stimulation of the secondary phase of induction, reflecting stomatal opening and described by the time required to reach maximum steady-state photosynthesis, was only 5-15% in F. sylvatica and 21-28% in P. abies.
    Trvalý link: http://hdl.handle.net/11104/0178743