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- W2081580905 abstract "THAT A voluminous literature has already been accumulated concerning auxins, or plant hormones, and various plant growth-promoting chemicals may be gathered from the work of Boysen-Jensen (1936) on this subject. Careful investigation has been made of the action of growth-stimulating chemicals on stems, shoots, and roots of various plants, and two interesting conclusions have been drawn therefrom. The first is that the growth of stems and shoots of various plants and the formation of roots in cuttings is remarkably stimulated by application of various chemicals, a finding of considerable practical value in horticultural propagation, as the work of Went (1929), Thimann (1934), Koepfli (1935), and their coworkers and the researches of Zimmerman, Hitchcock, and Wilcoxon (1935,1936) of the Boyce Thompson Institute for Plant Research have strikingly demonstrated. The second remarkable finding is the curious difference between the effect of growthstimulating chemicals and auxins on stems and their action on the growth of primary roots, for it has been asserted by most of those writing on this subject that while these chemicals promote the elongation of stems and shoots, they inhibit growth of primary roots. This was first shown by Nielsen in 1930 and later by Kogl, Haagen-Smit, and Erxleben (1934), Hitchcock and Zimmerman (1936) and others. This extraordinary finding has given rise to much speculation and consderable experimentation in an endeavor to elucidate the mechanism of plant-hormone action on the two different tissues. Thus Thimann (1936) concluded that the magnitude of auxin effect depends largely upon the direction in which it is applied. Marmer (1937), studying the effects of growth-stimulating chemicals on wheat seedlings, found that while the primary root is inhibited, the number of secondary roots is increased and there is change in effectiveness of these compounds at an alkaline pH. Robbins and Jackson (1937) on the basis of their experiments with growth-promoting drugs applied in the form of an ointment with a lanolin base concluded that these chemicals increase the extensibility of the stem cells and decrease the extensibility of the root cells and thus explain the difference in the action of auxin on the respective tissues. Leonian and Lilly (1937) concluded from their studies on the effect of plant-growth-promoting hormones on algae and on roots and shoots of germinated corn that indole acetic acid (heteroauxin) is to be regarded as a growth-inhibiting rather than a growthpromoting substance. In a recent paper by Amlong (1936), however, the question concerning the action on roots of growth-promoting substances is answered" @default.
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- W2081580905 date "1937-07-01" @default.
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- W2081580905 title "INFLUENCE OF INDOLE ACETIC, INDOLE BUTYRIC, AND NAPHTHALENE ACETIC ACIDS ON ROOTS OF LUPINUS ALBUS SEEDLINGS" @default.
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- W2081580905 doi "https://doi.org/10.1002/j.1537-2197.1937.tb09130.x" @default.
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