Experimental Coupling of Indoleacetic Acid to Pea Root Protein In Vivo and In Vitro.

that the molecular structure of an auxin may control its activity in growth by influencing the reaction reported here. On the basis of these experiments it is proposed that auxin may act in plant growth and metabolism at least in part by reacting with coenzyme A. It may be assumed that the reaction product is a high-energy ester like the thiol-esters of other acids with coenzyme A. From its position as an ester with coenzyme A, it is further suggested that auxin may act to control the wide variety of synthetic and metabolic reactions in plants which are known to require coenzyme A, and that in this manner the growth hormone may regulate plant growth.