In leaves of barley plants separately infested with CCN or WCM the activity of the GSNOR was increased by 1.6-fold upon CCN and 1.3-fold upon WCM infection in relation to the C plants, whereas in N + WCM plants the 0.6-fold reduction of the GSNOR activity was noted in comparison with both N and WCM plants (Fig. 2i). This evidence concerns the gene ADH5 and infection.