Počet záznamů: 1

Dynamic changes of canopy-scale mesophyll conductance to CO(2) diffusion of sunflower as affected by CO(2) concentration and abscisic acid

  1. 1.
    0367247 - BC-A 2012 RIV GB eng J - Článek v odborném periodiku
    Schaufele, R. - Šantrůček, Jiří - Schnyder, H.
    Dynamic changes of canopy-scale mesophyll conductance to CO(2) diffusion of sunflower as affected by CO(2) concentration and abscisic acid.
    Plant Cell and Environment. Roč. 34, č. 1 (2011), s. 127-136 ISSN 0140-7791
    Grant CEP: GA ČR GA206/08/0787
    Výzkumný záměr: CEZ:AV0Z50510513
    Klíčová slova: carbon isotope discrimination * water-stress * in-vivo
    Kód oboru RIV: EF - Botanika
    Impakt faktor: 5.215, rok: 2011

    Leaf-level measurements have shown that mesophyll conductance (g(m)) can vary rapidly in response to CO(2) and other environmental factors, but similar studies at the canopy-scale are missing. Here, we report the effect of short-term variation of CO(2) concentration on canopy-scale g(m) and other CO(2) exchange parameters of sunflower (Helianthus annuus L.) stands in the presence and absence of abscisic acid (ABA) in their nutrient solution. g(m) was estimated from gas exchange and on-line carbon isotope discrimination (Delta(obs)) in a 13CO(2)/12CO(2) gas exchange mesocosm. The isotopic contribution of (photo)respiration to stand-scale Delta(obs) was determined with the experimental approach of Tcherkez et al. Without ABA, short-term exposures to different CO(2) concentrations (C(a) 100 to 900 mu mol mol-1) had little effect on canopy-scale g(m).
    Trvalý link: http://hdl.handle.net/11104/0201991