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A substrate cycling model for nitrate uptake byPisum sativum seedlings: A key to sensitivity of response of net flux to substrate and effectors?

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Summary

Net nitrate uptake (J) intoPisum sativum L. seedlings has been investigated. J was high initially, but declined with time as NO −3 efflux (E) approached that of NO −3 influx (I). Both I and E were higher in plants which had been grown without N. J could be reversibly and immediately inhibited by 5 mmol m−3 NH +4 , although plants grown in the presence of nitrate were less sensitive. A theoretical model which involves substrate cycling across the plasmalemma is shown to increase the sensitivity to substrate and effectors. It predicts that during growth of Pisum in N free media the cycling rate (E/I) is increased and the sensitivity of net flux of inhibition by NH +4 is highest. The model also provides a means for control of cytoplasmic nitrate pool size [NO −3 ] c.

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Authors and Affiliations

  1. Botany Department, Science Site, Durham University, Durham, UK

    Celia E. Deane-Drummond

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  1. Celia E. Deane-Drummond
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Deane-Drummond, C.E. A substrate cycling model for nitrate uptake byPisum sativum seedlings: A key to sensitivity of response of net flux to substrate and effectors?. Plant Soil 91, 307–311 (1986). https://doi.org/10.1007/BF02198113

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  • DOI: https://doi.org/10.1007/BF02198113

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