SPECIFIC FACTORS OTHER THAN AUXIN AFFECTING GROWTH AND ROOT FORMATION

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Abstract
In expts. with etiolated pea seedlings (Pisum sativum) more information was collected concerning the effects of various growth factors on growth in length of stems, auxin swellings and root formation. By applying unphysiologically high concns. of indole acetic acid other internal factors involved in these processes became limiting and could be studied. Thus it was found that to produce growth in length of stems (or lateral buds) and auxin swellings in addition to auxin a factor coming from the roots, named caulocaline, is required. This factor only moves through living cells, and cannot cross a cut surface. For leaf growth a factor (phyllocaline), stored in the cotyledons, is necessary. And root formation only occurs in the presence of both auxin and rhizocaline, which factor is supplied by the cotyledons as well. Especially in the case of rhizocaline it could be shown that auxin causes a redistribution of the rhizocaline in the plant. Thus the specificity in development is explained on the basis of the presence of specific growth factors, the calines, which have to be considered as a new group of plant hormones.

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