Rapid Induction of Na+/H+ Exchange Activity in Barley Root Tonoplast 1

AUTOR(ES)

Garbarino, Joan

RESUMO

Na+/H+ exchange activity in barley (Hordeum vulgare cv CM-72) root tonoplast was induced by Na+ even in the presence of inhibitors of protein synthesis. Induction occurred with a half-time of only 15 minutes. When salt-treated roots were transferred to a nutrient solution containing no Na+, the activity disappeared with a similar time course. The data suggest that Na+/H+ exchange was due to activation of an existing protein rather than to de novo protein synthesis.

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