THE EFFECT OF AIR POLLUTANTS FROM BORZESTI INDUSTRIAL CENTER (BACAU DISTRICT) UPON PHYSIOLOGICAL PROCESSES OF WOODEN ANGYOSPERMES

(20.872 mg/g) and in August (20.659 mg/g). 1.IVANESCU LACRAMIOARA, TOMA C., GOSTIN

IRINA, TOMA O. (2001) In the polluted leaves of the tree closest to the source, this content is minimum in Responses of the plants to the action of atmospheric pollutants. Proceedings of the August (59.63%) and maximum in May (88.10%). The minimum value is caused by the International Conference Ecological Protection of the Planet Earth,

Xanthi, Greece, 5-8 considerable decrease of the chlorophyll “a” (51.37%) and of the chlorophyll “b” June 2001, vol.II : 981 -986 (64.10%) and the less important decrease of the carotenoidic pigments (93.52%). In the 2.IVANESCU

LACRAMIOARA, TOMA C. (2003) Influenta poluarii leaves of the tree located farther from the polluting source, the minimum value is 2.66% atmosferice asupra structurii plantelor. Ed. Fundatiei “Andrei Saguna” Constanta. (as compared with 4.05 in the control leaves) in August; it is determined by the low 3.MANESCU S., CUCU M., DIACONESCU M.L. (1994) Chimia sanitara a content of chlorophyll “a” (53.75%) in relation with the chlorophyll “b” (81.80%), mediului. Ed.

Medicala, Bucuresti compared with the control value. 4.YUNUS M., IQBAL M. (1996) Plant response to air pollution. John Wiley & The ratio chlorophylls a+b/carotenoidic pigments (a+b/c) in the polluted leaves

Sons, Chichester. New York. Brisbane. Toronto. Singapore of the tree closer to the polluting source is minimum in August (3.4 as compared to 5.9 in the control sample), because of the slightly low content of carotenoidic pigments Table no. 1-The variation of water and dry matter content in leaves of some wooden (93.52%). In the leaves of the tree located farther from the polluting source, this ration angiosperms is minimum in May (3.8 as compared to 5.1 in the control sample), because of the lower from Borzesti industrial area (g%) content of chlorophyll “a” (84.57%); as to the chlorophyll “b” and the carotenoidic pigments, their values surpass the control value, being of 106.21% and 116.27%, Month Taxon Control leaves (C) Distanc Polluted leaves respectively. Water Dry e from Water % Dry % content matter the toxic content Contro matter Control CONCLUSIONS content source l content Populus 69.84 30.16 ~100 m 56.27 80.56 43.73 144.99  The species investigated react to the aggression of the polluting agents, and their tremula ~900 m 58.13 83.23 41.87 138.82 reactions are conditioned by a multitude of factors (genetic, pedoclimatic, natural Tilia 70.36 29.64 ~250 m 66.23 94.13 33.77 113.93 MAY habitat, acclimation degree, distance and position in relation to the polluting source, tomentosa ~800 m 6719 95.49 32.81 1 10.69 age, physiological status etc.). AUGUST Populus 67.22 32.78 ~100 m 50.87 75.67 49.13 149.87  The leaf necroses identified on the ligneous species investigated represent the tremula ~900 m 51.35 76.39 48.65 148.41 concrete manifestation of a profound physiological modification that influences the Tilia 68.83 31.17 ~250 m 61.73 89.68 38.27 122.77 medium water and dry substance content in the plants affected by the aggression of tomentosa ~800 m 62.23 90.41 37.77 121.17 the polluting agents in the air. SEPTEMBER Populus 63 19 3681 ~100 m 44.36 70.20 55.64 151.15 tremula ~900 m 48.83 77.27 51.17 139.01  The high dry substance content is not always related to the distance from the Tilia 67.09 32.91 ~250 m 52.63 78.44 47.37 143.93 polluting source. This content is not always directly related to the macroscopically tomentosa ~800 m 58.47 87.15 41.53 126.19 visible necroses, fact which suggests that, in certain cases, the perturbation of some physiological functions is directly followed by defoliation and drying, and in other Tabel nr. 2b-The total medium content of assimilating pigments (a+b+c), the ratio Tabel nr. 2a-The variation of medium content of assimilating pigmentst in leaves of „a”chlorophyll/”b”chlorophyll (a/b) and the ratio chlorophylls and carotenoidic some wooden angiosperms from Borzesti industrial area (mg/g fresh matter) pigments (a+b/c) in leaves of some wooden angiosperms from Borzesti industrial area Taxon Month Distance a+b+c a/b a+b/c from the LC % LP % LC LP LC LP toxic source Populus tremula ~ 100m 11.014 78.30 2.39 4.1 May ~ 900m 14.065 100 13.295 94.52 2.74 2.43 7.1 5.1 ~ 100 10.697 62.94 2.47 2.2 August ~ 9m00m 16.95 100 15.326 90.40 2.56 2.41 7.2 3.0 ~ 100m 3 10.572 62.20 2.45 2.1 Septem ~ 900m 16.995 100 13.879 81.66 2.46 2.31 6.8 2.9 Tilia tomentosa ber ~ 250m 16.256 88.10 3.42 4.2 May ~800m 18.451 100 17.314 93.83 4.53 3.54 5.1 3.8 ~ 250m 12.320 59.63 3.24 3.4 August ~ 800m 20.659 100 13.032 63.08 4.05 2.66 5.9 4.1 ~ 14.194 68.00 2.85 3.7 Septem ~2 58000m m 20.872 100 13.416 64.27 3.99 3.33 5.4 4.3 ber Lc=control leaves, LP=polluted leaves Lc=control leaves, LP=polluted leaves