Stem Internode Elongation in the Japanese Morning Glory (Pharbitis nil Choisy) in Relation to an Inhibitor System of Auxin Destruction

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Abstract
Further investigations on a wild‐type strain of the Japanese morning glory (Pharbitis nil Choisy) to ascertain the relationship between stem internode maturation, decreasing rate of internode elongation, and increasing auxin destruction, have established the following: There exists in young, elongating, internode tissue, substances which prevent the destruction of indoleacetic acid by enzymes normally found in stem tissue. Almost all of the protecting activity can be attributed to two substances, one of them possessing an apparent molecular weight in the 5000 to 10,000 g/mol range, the other, in the 1500–5000 g/mol range. Both are water soluble, and heat labile, at least in vitro. It is further suggested that associated with Japanese morning glory stem maturation, is the loss of these auxin‐protecting substances, and as a consequence of this loss, the loss of further endogenous auxin‐induced elongation.

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