Interrelations of Ammonium Toxicity and Ethylene Action in Tomato

in HortScience
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  • 1 Department of Plant and Soil Sciences, University of Massachusetts, Amherst, MA 01003

Inhibitors of ethylene synthesis and action were used to alleviate ammonium toxicity in tomato (Lycopersicon esculentum Mill. `Heinz 1350') grown on ammonium-based nutrient solutions. Aminooxyacetic acid and Ag+ were effective in reducing ammonium toxicity, whereas Co+2 and salicylic acid were not. A hypothesis was developed to integrate ammonium accumulation and ethylene biosynthesis into a mechanism for expression of plant injury from environmental stresses.

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