Ethylene Evolution by Tomato Plants under Nutrient Stress

Abstract
Ethylene evolution was determined for tomato (Lycopersicon esculentum Mill.) plants grown under nutrient-deficient (N, P, K, Ca, Mg, S) conditions or under full nutrition with NH4+ or NO3 in sand culture. Ethylene evolution increased for plants deficient in K, Ca, or Mg relative to that of plants grown on nutritionally complete solutions with NO3. Deficiency of N, P, or S did not stimulate ethylene evolution relative to that detected from plants grown with complete nutrition with NO3. Physiological stress from NH4+ nutrition produced enhancements in ethylene evolution that exceeded those due to deficiencies of macronutrients.

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