. Auxins and plant growth. Auxin; Plant growth promoting substances. Occurrence and Role of Growth Hormones 63 from which to produce free auxin), then it would seem Hkely that the adjoining young leaves, rich in bound auxin, may be the primary source of the free auxin which appears at the stem Free Auxin Bound Auxin Fig. 30. Diagram of the distribution of free and bound auxin in the vegetative pineapple plant. Figures represent microgram equivalents of indoleacetic acid per kg. fresh weight (van Overbeek et al, 1947). Surveys of auxin distributions in other plants have been made and the
. Auxins and plant growth. Auxin; Plant growth promoting substances. Occurrence and Role of Growth Hormones 63 from which to produce free auxin), then it would seem Hkely that the adjoining young leaves, rich in bound auxin, may be the primary source of the free auxin which appears at the stem Free Auxin Bound Auxin Fig. 30. Diagram of the distribution of free and bound auxin in the vegetative pineapple plant. Figures represent microgram equivalents of indoleacetic acid per kg. fresh weight (van Overbeek et al, 1947). Surveys of auxin distributions in other plants have been made and the highest auxin concentrations found in some of these are listed in table 5. It seems evident that the greatest quantities of auxin charac- TABLE 5 Some Examples of Auxin Concentrations Found in Plants Species Greatest cone. found (/xg lAA equivalents/kg. fr. wt.) Organ or tissue Reference Corn 105,000 endosperm Berger & Avery, 1944 14,800 whole kernel Haagen-Smit et al, 1946 Lily (white trumpet) 83,900 stem tip Stewart & Stuart, 1942 Wheat 22,000 endosperm Haagen-Smit et al, 1942 170 endosperm Avery et al, 1941 Oat 1,000 grain Avery et al, 1941 Rice 250 endosperm Avery et al, 1941 Turnip 250 seed Avery et al, 1941 Sunflower 74 stem Henderson & Bonner, 1952 Beet 50 seed Avery et al, 1941 Pineapple 11 young leaf van Overbeek et al, 1947 Bean 8 young leaf Shoji et al, 1951 Macrocystis pyrifera terminal blade van Overbeek, 1940. 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
Size: 2374px × 1053px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookpublisherberkeleyuniversityofcaliforniapre
