. Auxins and plant growth. Auxin; Plant growth promoting substances. 108 Fundamentals of Auxin Action pold and Guernsey (1953) who have demonstrated that various carbo- hydrates, amino acids, and organic acids applied to pea seedlings in minute amounts could quantitatively inhibit flower formation, and application of auxins would in the same manner quantitatively inhibit flower formation. The criterion of flowering, or earliness, was taken UJ O o 13. ^ • >^ Arginine Plus ^>^ Auxin f 10 -8 10- 10 -6 10-^ M. CONG. OF ARGININE Fig. 49. The inhibition of flowering in the pea by arginine and
. Auxins and plant growth. Auxin; Plant growth promoting substances. 108 Fundamentals of Auxin Action pold and Guernsey (1953) who have demonstrated that various carbo- hydrates, amino acids, and organic acids applied to pea seedlings in minute amounts could quantitatively inhibit flower formation, and application of auxins would in the same manner quantitatively inhibit flower formation. The criterion of flowering, or earliness, was taken UJ O o 13. ^ • >^ Arginine Plus ^>^ Auxin f 10 -8 10- 10 -6 10-^ M. CONG. OF ARGININE Fig. 49. The inhibition of flowering in the pea by arginine and the reversal of its effect by the addition of auxin, naphthaleneacetic acid (Leopold and Guernsey, unpublished). to be the node of first flower. However, as figure 49 indicates, the inhibitory action of the carbohydrates, amino acids, or organic acids, could be erased by the concomitant addition of auxin. The interesting subject of the influence of auxins on flowering is discussed in more detail in chapter XIV. FRUIT DEVELOPMENT The classic researches of Gustafson (1936 et seq.) have established that auxins are capable of causing the commencement of fruit develop- ment in many species without pollination. Indeed it appears that the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Leopold, A. Carl (Aldo Carl), 1919-. Berkeley, University of California Press
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