About this Agricultural and Biological Sciences article

Effects of air pollutants on proton and sucrose transport at the plasma membrane of Ricinus communis by C. E. RUSSELL; J. PITTMAN; N. M. DARRALL; L. E. WILLIAMS; J. L. HALL is a Agricultural and Biological Sciences article available to read on EtoBox.

The effects of the air pollutants O~3~, SO~2~ and NO~2~ on aspects of sucrose/proton cotransport across the plasma membrane of __Ricinus communis__ plants have been investigated. The H^+^‐ATPase hydrolytic activity in cotyledon plasma membrane vesicles purified by phase partitioning showed small stimulations by Na~2~SO~3~ or NaNO~3~ added separately or together to the assay medium. ATPase activity from plants pretreated by fumigation with SO~2~ or O~3~ also showed an increase, the effect of O~3~ being quite marked. Plasma membrane H^+^‐pumping in KI‐treated microsomal fractions and medium acidification by intact cotyledons both showed small decreases in the presence of Na~2~SO~3~ or NaNO~2~. Both Na~2~SO~3~ and NaNO~2~ at high concentrations (2 mol m^–3^) had significant effects on sucrose uptake by intact cotyledons, although sucrose efflux was unaffected. No significant effects on sucrose uptake or efflux by intact cotyledons were observed in plants pretreated by fumigation with SO~2~ or O~3~. Proton‐coupled sucrose transport in isolated plasma membrane vesicles was inhibited in the presence of Na~2~SO~3~ or NaNO~2~. However, both pollutants also significantly inhibited the uptak

Author

C. E. RUSSELL; J. PITTMAN; N. M. DARRALL; L. E. WILLIAMS; J. L. HALL

Publisher

John Wiley and Sons; Wiley (Blackwell Publishing); Blackwell Publishing Inc.; Wiley (ISSN 0140-7791)

Published

1999

Language

EN

Field

Agricultural and Biological Sciences (Life Sciences)