Abstract
1. Hormones of the spikes of wheat extracted at four different stages,viz., (a) Young spikes enclosed within the leaf-sheath, (b) Pre-anthesis (c) Anthesis, (d) Post-anthesis,i.e., 15 days after pollination, were injected into the leaves, of ages synchronising with the 4 stages of the plant. 2. The injections of the extracts at the first two stages did not bring about any significant difference in their respiratory activity. But the extracts at the two subsequent stages,viz., Anthesis and Post-anthesis had a marked effect; with this difference that the extract at stage 3 brought an immediate enhancement of the respiratory activity while at the 4th stage it reached its maximal at the end of 24 hours. 3. The hormone extract increases the hydrolysis facility of both the proteins and carbohydrates.
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