Studies on the change of the respiratory system in roots in relation to the growth of plants V. Effect of root pruning terminal oxidase activity in roots of cereal crops :

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This experiment studies the comparative activities of terminal oxidases (Fe-containing oxidases, Cu-containing oxidases and CN-resistant oxidases) in roots of rice and wheat seedlings and the effect of root pruning on these terminal oxidases in the roots of those crops. Data indicate that (i) excepting a change in the activity of Cu-containing oxidases no appreciable difference in respiration or in Fe-containing and CN-resistant oxidases was noticed in the two types of seedling roots and (ii) root pruning did not produce any noticeable change in terminal oxidase activities in roots of wheat seedlings. A drastic change in terminal oxidase activities in roots of rice seedlings was observed, suggesting that a close relationship exists between CN-resistant oxidase and transplanting time.

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