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Primerjalni vplivi stresnih dejavnikov na hormonsko regulacijo rasti korenin in mikorize pri mladem in odraslem drevju = Comparative impacts of stress factors on hormonal regulation of roots and ectomycorhrizae in young and adult trees
Kraigher, Hojka ; Grebenc, Tine ; Hanke, David E.
Troposferni ozon (O3) je sekundarni onesnaževalec, ki nastaja na svetlobi iz dušikovih oksidov in hlapnih organskih spojin. O3 inducira fiziološke spremembe v listju, ki vplivajo na nastanek ...produktov fotosinteze (asimilatov)in s tem na "source-sink" odnose v rastlini. Zmanjšana proizvodnjaasimilatov, povečan metabolizem zaradi reparacijskih mehanizmov in zmanjšanje prenosa asimilatov po floemu vplivajo na zmanjšan dotok asimilatov v koreninski del ter s tem na spremembe v rasti korenin, razvoju simbioz, rizodepozicijo, kvaliteto in kvantiteto opada in posledično na vso prehranskoverigo v tleh (Andersen 2003). Razmerja med izvorom in ponorom ogljika oziroma funkcionalno ravnovesje med koreninami in nadzemnimi poganjki predstavljajo primarne dejavnike v stalnem prilagajanju rasti korenin in nadzemnih delov (Tingey et al. 1996), kar lahko poteka na podlagi prenosa dražljajev med koreninami in poganjki in hormonske regulacije rasti korenin. Vtem primeru je lahko vpliv prepihovanja bukev z ozonom na vsebnost citokininov (CK) (Winwood et al. 2007) odvisno od spremenjene sestave mikorizne združbe (Grebenc in Kraigher 2006), ki povratno vpliva na spremembe v vsebnosti citokininov v mikorizni rastlini (Kraigher et al. 1991, 1993). Vplivi ozona na rast in razvoj korenin in mikorize pri odraslih (Grebenc in Kraigher 2006) in mladih rastlinah bukve (Železnik et al. 2007) so bili različni, torej je odziv bukve odvisen od fiziološkega stanja rastline, ki se s starostjo in velikostjo rastline močno spreminja.
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