RESPIRATORY RATE AND ENZYME ACTIVITY AS RELATED TO THE HARDENED CONDITION OF PLANTS

Abstract

Winter wheat and cabbage plants were grown in the greenhouse in sand cultures under various nutrient conditions. Plants high in carbohydrates, capable of hardening when kept at 2[degree]C in the dark, and plants low in carbohydrates, and in-capable of so hardening, were compared in regard to respiratory rate and enzyme activity. Over a period of 2 weeks at 2[degree]C, all samples gradually decreased in respiratory rate, until the final output of CO2 per gm. dry matter was about