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Induction of the Na+/Pi cotransport system in the plasma membrane of Chara corallina requires external Na+ and low levels of Pi by T. Mimura; R. J. Reid; Y. Ohsumi; F. A. Smith is a Agricultural and Biological Sciences article available to read on EtoBox.

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## Abstract It was shown in previous studies that the giant freshwater alga __Chara corallina__ does not control its Na^+^‐dependent Pi uptake by monitoring the internal Pi concentration and it was hypothesized that __Chara__ may instead detect changes in Pi supply from the environment. The present work investigated the conditions that control the induction and inactivation of high affinity Na^+^/Pi influx in __Chara__. Withdrawal of Pi from the external medium resulted in a gradual increase in the rate of uptake measured immediately after Pi was resupplied. The increase continued for at least 7 d of starvation. In the initial stages, 0·5 or 1 __μ__m Pi were more effective at inducing transport activity than no Pi, suggesting that low levels of Pi are actually required for induction. The high Na^+^‐dependent Pi uptake observed in Pi‐starved cells was inactivated by treatment with as little as 1 __μ__m Pi over 6 d. External Na^+^ plays a major role in controlling the capacity for Na^+^/Pi cotransport activity, and in the absence of Na^+^, both induction and inactivation were either delayed or abolished. Na^+^ starvation stimulated Na^+^ uptake even though there were no measurable ch

Who reads Induction of the Na+/Pi cotransport system in the plasma membrane of Chara corallina requires external Na+ and low levels of Pi?

Author

T. Mimura; R. J. Reid; Y. Ohsumi; F. A. Smith

Publisher

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

Published

2002

Language

EN

Field

Agricultural and Biological Sciences (Life Sciences)