Pigment Concentrations and Ratios of Aleppo Pine Seedlings Exposed to Ozone
Abstract
Two-year-old Aleppo pine (Pinus halepensis Mill.) seedlings were exposed to ambient air+50 ppb O3 in open-top chambers (24 hours/day, 7 days/week) during May-October 1997 and to ambient air+70 ppb O3 from May 1998 onwards. One growing season fumigation with ozone did not affect the pigment concentrations of the current-year (c) needles, nor were there any differences in photosynthesis or stomatal conductance. In May 1998, however, a marked carry-over effect was seen in the chlorophyll a and b and total carotenoid concentrations of the O3-fumigated one-year-old (c+l) needles. The chlorophyll a and b and total carotenoid concentrations of newly flushed needles of the O3-fumigated seedlings also seemed to be slightly decreased, as was their net photosynthesis when compared to the values of the filtered-air control needles. The chlorotic mottle and the changes in chloroplast pigments and photosynthesis of the c and/or c+l needles of the NFA+O3 seedlings in May 1998 indicate that frequent episodes of ozone concentrations of ≥ 100 ppb, especially when they also occur during the evening and night hours, as in some areas in southern Europe, may result in visible needle damage on Aleppo pine.
Keywords
Pinus halepensis chlorophyll carotenoid net photosynthesis visible damagePreview
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