Psidium guajava 'Paluma' (the guava plant) as a new bio-indicator of ozone in the tropics |
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Authors: | Furlan C M Moraes R M Bulbovas P Domingos M Salatino A Sanz M J |
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Institution: | Departamento de Botanica, Instituto de Biociências, Universidade de S?o Paulo, CP 11461, S?o Paulo, SP, Brazil. furlancm@yahoo.com.br |
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Abstract: | Psidium guajava 'Paluma' saplings were exposed to carbon filtered air (CF), ambient non-filtered air (NF), and ambient non-filtered air+40ppb ozone (NF+O(3)) 8h per day during two months. The AOT40 values at the end of the experiment were 48, 910 and 12 895ppbh(-1), respectively for the three treatments. After 5 days of exposure (AOT40=1497ppbh(-1)), interveinal red stippling appeared in plants in the NF+O(3) chamber. In the NF chamber, symptoms were observed only after 40 days of exposure (AOT40=880ppbh(-1)). After 60 days, injured leaves per plant corresponded to 86% in NF+O(3) and 25% in the NF treatment, and the average leaf area injured was 45% in NF+O(3) and 5% in the NF treatment. The extent of leaf area injured (leaf injury index) was explained mainly by the accumulated exposure of ozone (r(2)=0.91; p<0.05). |
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