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Alteracoes fisiologicas em Phaseolus vulgaris L., cv. Negrito- 897 submetido a diferentes doses de dioxido de enxofre

By: Contributor(s): Material type: ArticleArticleLanguage: Portuguese Description: 1(1):19-24Subject(s): LOC classification:
  • 37340
Online resources: In: Revista Brasileira de Fisiología VegetalSummary: Se fumigaron plantas de frijol con SO2 a 8 mas o menos 1 ppm durante 15, 30, 45 y 60 min para estudiar algunas alteraciones fisiologicas durante las primeras 96 h siguientes a la exposicion al gas. Se evaluaron los efectos del SO2 mediante determinaciones del contenido relativo de agua (CRA), la resistencia estomatica a la difusion de vapor de agua y la asimilacion de CO2. La fotosintesis fue el proceso mas afectado por el gas, presentando tasas reducidas despues de 15 min de exposicion al contaminante, y una reduccion de 71 por ciento despues de 60 min de exposicion. La reduccion que se observo en las tasas fotosinteticas no se relaciona con las respuestas de los estomas a SO2. El cierre parcial de los estomas se observo por primera vez despues de 30 min de exposicion. Con 60 min de exposicion al gas, la resistencia estomatica aumento en 44 por ciento. El CRA foliar no fue un parametro altamente sensible a la accion del SO2. Este parametro disminuyo solo en 1.17 por ciento con 60 min de exposicion. (RA- CIAT)Summary: Bean plants were fumigated with SO2 at 8 plus or minus 1 ppm, for 15, 30, 45 and 60 minutes to study some physiological alterations during the first 96 hours after exposure to the gas. The effects of SO2 were evaluated by determining the relative water content (RWC), the stomatal resistances to the diffusion of water vapour, and the assimilation of CO2. Photosynthesis was the process more affected by the gas presenting reduced rates after 15 minutes of exposure to the pollutant, and a reduction of 71 percent after 60 minutes of exposure. The depression which was observed in the photosynthetic rates seems not to be strongly related with the responses of stomata to SO2. Partial stomatal closure was first observed after 30 minutes of exposure. With 60 minutes of exposure to the gas the stomatal resistance was increased by 44 percent. The leaf RWC did not represent a parameter of high sensitivity to the action of the SO2. This parameter decreased only in 1.17 percent with 60 minutes of exposure. (AS)
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Journal Article Journal Article CIAT Library Document collection CINFOS Document Collection CINFOS 37340 (Browse shelf(Opens below)) c.1 Short Loan 100056743
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Se fumigaron plantas de frijol con SO2 a 8 mas o menos 1 ppm durante 15, 30, 45 y 60 min para estudiar algunas alteraciones fisiologicas durante las primeras 96 h siguientes a la exposicion al gas. Se evaluaron los efectos del SO2 mediante determinaciones del contenido relativo de agua (CRA), la resistencia estomatica a la difusion de vapor de agua y la asimilacion de CO2. La fotosintesis fue el proceso mas afectado por el gas, presentando tasas reducidas despues de 15 min de exposicion al contaminante, y una reduccion de 71 por ciento despues de 60 min de exposicion. La reduccion que se observo en las tasas fotosinteticas no se relaciona con las respuestas de los estomas a SO2. El cierre parcial de los estomas se observo por primera vez despues de 30 min de exposicion. Con 60 min de exposicion al gas, la resistencia estomatica aumento en 44 por ciento. El CRA foliar no fue un parametro altamente sensible a la accion del SO2. Este parametro disminuyo solo en 1.17 por ciento con 60 min de exposicion. (RA- CIAT)

Bean plants were fumigated with SO2 at 8 plus or minus 1 ppm, for 15, 30, 45 and 60 minutes to study some physiological alterations during the first 96 hours after exposure to the gas. The effects of SO2 were evaluated by determining the relative water content (RWC), the stomatal resistances to the diffusion of water vapour, and the assimilation of CO2. Photosynthesis was the process more affected by the gas presenting reduced rates after 15 minutes of exposure to the pollutant, and a reduction of 71 percent after 60 minutes of exposure. The depression which was observed in the photosynthetic rates seems not to be strongly related with the responses of stomata to SO2. Partial stomatal closure was first observed after 30 minutes of exposure. With 60 minutes of exposure to the gas the stomatal resistance was increased by 44 percent. The leaf RWC did not represent a parameter of high sensitivity to the action of the SO2. This parameter decreased only in 1.17 percent with 60 minutes of exposure. (AS)

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