PLANT HORMONES, GROWTH AND RESPIRATION

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Abstract
A review, covering; the growth of sections of oat coleoptiles and pea stems in auxin solns.; the inhibition of this growth by iodoacetate, arsenite and certain organic mercurials; evidence that growth is limited by an enzyme system of sulfhydryl nature; the promotion of growth by di- and tri-car-boxylic acids and the amts. of these acids present in the plant material; and metabolic changes occurring when growth is inhibited. It is concluded that the inhibition of growth in presence of auxin is not the same as the mere absence of growth; "it is a positive process and leads to the diversion of sugar metabolism into other pathways." Furthermore it is suggested that the action of auxin "may be that of a switch, causing the metabolism to go via the growth-promoting system instead of by another.".