XVI International Botanical Congess

Photosyntetic apparatus of plant react sensitively to stress affect of different toxicants. The influence of HF on the content of chlorophyll Aa@, Ab@, on the sum of chlorophylls Aa+b@ and on the sum of carotenoids in leaves Sorbus aucuparia L., Quercus robur L., Ulmus pinnato-ramosa Dieck. ex Koechne, Aesculus hippocastanum L., Acer platanoides L. has been studied. Shoots were fumigated HF (0.02 mg/m3, 0.2 mg/m3, 1.0 mg/m3) for 4, 8 and 24 h. The stress affect HF leads to considerable changes of quantity of pigments in leaves. The content of main pigments of photosynthes is decreasing. The most decreasing was marked for chlorophyll Ab@ in S. aucuparia, Q. robur, U. pinnata-ramosa (more than in 2 times), while in A. hippocastanum and A. platanoides in 19-26%. In leaves of all studied species the quantity of chlorophyll Aa@ is decriasing in 5-12%. These data showed us the more stability of chlorophyll Aa@. In leaves of A. platanoides, U. pinnato-ramosa, S. aucuparia the quantity of carotenoids under stress affect is increasing in1.6-7.3 times, in A. hippocastanum is decreasing in 1.5-2.3 times.