Effect of Benzoic Acid and its Derivatives on Plant Metabolism' VIII. Effect of Amino Derivatives of Benzoio Acid on Respiration of Starved and Suorosewfed Etiolated Barley Leaves
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In a previous paper (Naguib 1962) the author reviewed the literature on the classification of benzoic acid derivatives into growthwinhihiting and growth-promoting substances. Salama (1959) discussed the effects of p.aminobenzoic acid on the respiration of the fungal mats of Rhizoctonia solani and concluded that very low concentrations of this substance (0�4 and 3� 2 p.p.m.) caused inhibition of respiration, despite the fact that this substance was regarded as a growth promoter for lower organisms and a constituent in the biological synthesis of folic acid (Hotson 1952).