Abstract
To study the possible differences in tropospheric ozone (O3) tolerance of oat (Avena sativa L.) and wheat (Triticum aestivum L.), two oat and two wheat cultivars were exposed to 0, 50, or 100 nL·L–1O3concentrations in growth chambers. Measurements on volatile organic counpound emission and physiological, biochemical, and leaf structural characteristics were conducted with 2- and 4-week-old seedlings. Neither of the studied species was particularly O3sensitive, but O3sensitivity should rather be defined on the basis of the characteristics of the cultivars within species. Visible leaf injuries increased with leaf age and with increasing O3concentration. Net photosynthesis (Pn), stomatal conductance (gs), and chlorophyll fluorescence (Fv/Fm) of 2-week-old seedlings were more detrimentally affected by O3compared with older seedlings. Wheat generally invested more in photosynthesis and related processes, such as gs, Fv/Fm, concentrations of Rubisco, chlorophylls and carotenoids, and synthesis of starch compared with oat. O3increased Rubisco concentration in 2-week-old and carotenoid concentration in 4-week-old seedlings, especially in wheat. Lower extent of O3-caused visible leaf injuries in the other oat cultivar can supposedly be explained by its low stomatal conductance and high monoterpene production.
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