Stomatal Response and Leaf Injury of Pisum sativum L. with SO2 and O3 Exposures 12: II. INFLUENCE OF MOISTURE STRESS AND TIME OF EXPOSURE
AUTOR(ES)
Olszyk, David M.
RESUMO
Stomatal response during exposure to SO2 and O3 and subsequent leaf injury were examined in plants of Pisum sativum L. `Alsweet' grown in a peat-vermiculite medium in controlled environment chambers. Plants developing under moisture stress, induced by drying the medium to 50% of field capacity, exhibited greater stomatal closure during exposures and less than one-fourth the necrosis compared to plants developing in a medium maintained at field capacity. Plants under moisture stress had only a slightly more negative plant water potential (≃−4.0 bars) than at field capacity (≃−3.4 bars). Plants exposed to pollutants for 2 hours near the beginning or end of a 16-hour light period had greater stomatal closure during exposures and less leaf necrosis than plants exposed during the middle of the light period.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=425722Documentos Relacionados
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