AMINO ACIDS IN THE NUTRITION OF EXCISED TOMATO ROOTS

Abstract

A preliminary study of the growth-promoting materials obtainable from yeast and essential for the nutrition of excised tomato roots (10) has shown that all of these materials are soluble in 85 per cent, ethyl alcohol, insoluble in ether, and stable in boiling trichloroacetic acid. They can be further divided into two fractions by extracting with absolute alcohol. Both fractions are essential for satisfactory growth. The present paper deals with results of an analysis of that fraction which is soluble in 85 per cent, alcohol and insoluble in 100 per cent, alcohol and ether. The basic nutrients, cultural methods, and materials used have been the same as those previously described.