Seedlings of durum wheat [Triticum turgidum subsp. durum (Desf.) Husn] were exposed to zinc nutrition and to ozone (O3) in a factorial combination: adequate (+Zn treatment) or no Zn (−Zn) in the nutrient solution, followed by exposure to either ozone-free air (filtered air, FA) or to 150 nL L−1 ozone (O3) for 4 h. Although omitting Zn from the nutrient solution failed to impose a genuine Zn deficiency, −Zn*FA durum wheat seedlings showed a typical deficiency behaviour, i.e. Zn mobilisation from root to shoot. Such interorgan Zn redistribution, however, did not occur in −Zn*O3 plants. Exposure to each stress singly decreased the activity and the protein amount of foliar plasma membrane H+- ATPase, but not stress combination, which even increased the H+-ATPase expression with respect to control. In the −Zn*O3 plants, moreover, the foliar activities of the plasma membrane-bound NAD(P)H-dependent superoxide synthase and of Cu,Zn-superoxide dismutase, and the transcripts abundance of the luminal binding protein and of the protein disulphide isomerase, were also stimulated. It is proposed that, even in the absence of actual Zn starvation, the perception of deficiency conditions could trigger changes in redox homoeostasis at the plasma membrane level, helpful in compensating an O3-dependent oxidative damage.
|Titolo:||On the interactions among zinc availability and responses to ozone stress in durum wheat seedlings.|
|Data di pubblicazione:||2018|
|Appare nelle tipologie:||1.1 Articolo in rivista|
File in questo prodotto:
|De_Biasi_2018_Environ_Sci_ Pollut_ Res_On_the_Interaction_editor.pdf||Versione Editoriale (PDF)||Tutti i diritti riservati (All rights reserved)||Administrator Richiedi una copia|