ROOT INITIATION: A SURVEY OF CURRENT LITERATURE1
John J. McGuire
Initiation of adventitious roots results from the interaction of numerous interrelated physiological and anatomical factors. In a summary of the subject in 1974, Snyder (32) reported that such an event depends upon the presence of cells capable of dividing and differentiating as root initials as well as the presence of favorable internal and external environments. In other words, a cell must be living and undifferentiated.
It has been known for many years that auxin (IAA) or one of its derivatives is a major controlling factor, but we still do not know specifically how auxin exerts this control over cell function. We know it stimulates root initiation in a manner similar to cytokinin, polyphenols, gibberellins, carbohydrate, boron, nitrogen and a host of other compounds. We know also that it is not the absolute amount of plant hormone that exerts this action rather the relative amounts of each in proportion to the other. Most recently it has been suggested auxin may be just another cofactor
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