. Auxins and plant growth. Auxin; Plant growth promoting substances. 204 Auxins in Agriculture cuttings with sugars and nitrogenous compounds. In figure 87 it can be seen that there is a cjuantitative increase in roots formed in red hibiscus cuttings with the presence of leaves, and that the promotive effect can be entirely replaced by sucrose plus ammonium sulphate. It can also be seen that without the addition of auxin (indolebutyric acid) rooting is essentially absent whether these nutrients are pro- vided or not. These same workers convincingly demonstrated that leaves do, in fact, supply
. Auxins and plant growth. Auxin; Plant growth promoting substances. 204 Auxins in Agriculture cuttings with sugars and nitrogenous compounds. In figure 87 it can be seen that there is a cjuantitative increase in roots formed in red hibiscus cuttings with the presence of leaves, and that the promotive effect can be entirely replaced by sucrose plus ammonium sulphate. It can also be seen that without the addition of auxin (indolebutyric acid) rooting is essentially absent whether these nutrients are pro- vided or not. These same workers convincingly demonstrated that leaves do, in fact, supply the cutting with the same types of nutrient materials which had been added in the experiment described, namely sugars and soluble nitrogenous materials. Chemical analysis of cuttings with various numbers of leaves revealed that the content of reducing and non-reducing sugars and of soluble nitrogenous materials in the cutting was dependent upon the number of leaves. The nutritive effects of leaves are illustrated in figure 88. Van Overbeek et al (1946) stated that organic forms of nitrogen e> V- O (T UJ Q- q: o h- o o. Auxin + Sucrose +{NHJ,SOa Sucrose + (NH4)2S04 Control NUMBER OF LEAVES Fig. 87. The effect of leaves on cuttings of red hibiscus in permitting stimula- tion of root formation by auxin (2000 indolebutyric acid). The promotive effects of leaves can be entirely replaced by supplying 4 per cent sucrose and per cent ammonium sulphate (van Overbeek et al, 1946).. 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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