Abstract
Soil drenches containing 250 μg of paclobutrazol or uniconazol (50 ml of a 17 μM solution) reduced the height of both corn (Zea mays L. cv. How.Sweet It Is) and soybean (Glycine max (L.) Merr. cv. A2) seedlings. With corn, uniconazol was considerably more active than paclobutrazol in reducing height whereas with soybean both compounds had similar dwarfing effects. The compounds increased foliar chlorophyll content and leaf thickness in soybean but had no effect on these parameters in corn. The increase in leaf thickness with soybean was due primarily to an increase in the thickness of the palisade cell layer. Chloroplast size and ultrastructure of both species were unaffected by the compounds. The growth regulators increased root diameter in both corn and soybean because of increased size of cortical parenchyma cells and particularly in soybean because of radial rather than longitudinal growth of the first few layers of the cortical parenchyma.
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Bassi, P. K., Abernathy, S. M., Glazier, D. E.: Comparative efficacy of XE-1019D with other plant growth regulators. Proc. Plant Growth Reg. Soc. Amer.13: 54–61, 1986.
Bausher, M. G., Yelenosky, G.: Morphological changes in Citrus associated with relatively high concentration of paclobutrazol. J. Plant Growth Regul.5: 139–147, 1987.
Dalziel, J., Lawrence, D. K.: Biochemical and biological effects of kaurene oxidase inhibitors, such as paclobutrazol. - In:Menhenett, R.,Lawrence, D. K. (ed.): Biochemical Aspects of Synthetic and Naturally Occurring Plant Growth Regulators. Pp. 43–57, British Plant Growth Regulator Group, Monograph No. 11, Wantage 1984.
Davis, T. D., Sankhla, N.: Altered diurnal leaf movements in soybean seedlings treated with triazole growth regulators. Plant Cell Physiol.28: 1345–1349, 1987.
Davis, T. D., Sankhla, N., Upadhyaya, A.: Paclobutrazol: A promising plant growth regulator. In:Purohit, S. S. (ed.) Hormonal Regulation of Plant Growth and Development. Vol. III. Pp. 311–331. AgroBotanical Publishers, Bikaner 1986.
Davis, T. D., Steffens.G. L., Sankhla, N.: Triazole plant growth regulators. In:Janick, J. (ed.): Horticultural Reviews. Vol. 10. Pp. 63–105. Timber Press, Portland 1988.
Fletcher, R. A., Hofstra, G., Gao, J.: Comparative fungitoxic and plant growth regulating properties of triazole derivatives. Plant Cell Physiol.27: 367–371, 1986.
Hiscox, J. D., Israelstam, J. F.: A method for the extraction of chlorophyll from leaf tissue without maceration. Can. J. Bot.57: 1332–1334, 1979.
Jaggard, K. W., Lawrence, D. K., Biscoe, P. V.: An understanding of crop physiology in assessing a plant growth regulator on sugar beet. In:McLaren, J. S. (ed.): Chemical Manipulation of Crop Growth and Development. Pp. 139–150. Butterworth, London 1982.
Sankhla, N., Davis, T. D., Upadhyaya, A., Sankhla, D., Walser, R. H., Smith, B. N.: Growth and metabolism of soybean as affected by paclobutrazol. Plant Cell Physiol.26: 913–921, 1985.
Sankhla, N., Davis, T. D., Jolley, V. D., Upadhyaya, A.: Effect of paclobutrazol on the development of iron chlorosis in soybeans. J. Plant Nutr.9: 923–934, 1986.
Spurr, A. R.: A low viscosity epoxy resin embedding medium for electron microscopy. J. Ultrastruct. Res.26: 31–43, 1969.
Steffens, G. L., Byun, J. K., Wang, S. Y.: Controlling plant growth via the gibberellin biosynthesis system. I. Growth parameter alterations in apple seedlings. Physiol. Plant.63: 163–168, 1985.
Wang, S. Y., Faust, M.: Effect of growth retardants on root formation and polyamine content in apple seedlings. J. amer. Soc. hort. Sci.111: 912–917, 1986.
Wieland, W. F., Wample, R. L.: Effect of paclobutrazol on growth, photosynthesis, and carbohydrate content of “Delicious” apples. Scientia Hort.26: 139–147, 1985.
Williamson, J. G., Coston, D. C., Grimes, L. W.: Growth responses of peach roots and shoots to soil and foliar-applied paclobutrazol. HortScience21: 1001–1003, 1986.
Wood, B.W.: Influence of paclobutrazol on selected growth and chemical characteristics of young pecan seedlings. HortScience19: 837–839, 1984.
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Barnes, A.M., Walser, R.H. & Davis, T.D. Anatomy ofZea mays andGlycine max seedlings treated with triazole plant growth regulators. Biol Plant 31, 370–375 (1989). https://doi.org/10.1007/BF02876355
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DOI: https://doi.org/10.1007/BF02876355