Abstract
Despite numerous considerations of the importance of proton extrusion to plant mineral nutrition, measurements of net H+ efflux rates in photo-autotrophic plants growing in complete medium are rare, and the rates of efflux reported are considerably lower than that typical of low-salt seedlings. We present here the first report of short term net proton efflux from roots of a halophyte. and the highest rate of net efflux reported to date for any higher plant, in both low-salt and complete nutrient media. We also show responses of that efflux to a variety of treatments, including NaCl fusicoccin, shoot excision and darkness.
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