The influence of mechanical impedance on the growth of maize roots
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Maize roots were grown between 1 mm glass beads on which a pressure of 40 kPa was applied. The roots were supplied with a constant flow of aerated nutrient solution. Compared with roots grown in a nutrient solution, the impeded crown roots showed a reduction in length of about 75%, whereas the diameter was about 50% increased.
These changes in root morphology have been attributed to changes in cell wall structure of the cortex cells, which also occur as a result of the influence of ethylene.
It is suggested that ethylene acts as an intermediate factor in the effect of mechanical impedance on root growth.
Key wordsCell wall structure Ethylene Maize Mechanical impedance Root growth
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- 1.Barley K P 1963 Influence of soil strength on growth of roots. Soil Sci. 96, 175–180.Google Scholar
- 2.Barley K P 1965 The effect of localized pressure on the growth of the maize radicle. Aust. J. Biol. Sci. 18, 499–503.Google Scholar
- 3.Burg S P and Burg E A 1968In Biochemistry and Physiology of Plant Growth Substances. Eds. F Wightman and G. Setterfield pp 1275–1294 Runge Press, Ottawa.Google Scholar
- 4.Gill W R and Bolt G H 1955 Pfeffer's studies of the root growth pressures exerted by plants. Agron. J. 47, 166–168.Google Scholar
- 5.Gill W R and Miller R D 1956 A method for study of the influence of mechanical impedance and aeration on the growth of seedling roots. Soil Sci. Soc. Am. Proc. 20, 154–157.Google Scholar
- 6.Goeschl J D, Rappaport L and Pratt H K 1966 Ethylene as a factor regulating the growth of pea epicotyls subjected to physical stress. Pl. Physiol. 41, 877–884.Google Scholar
- 7.Goss M J 1977 Effects of mechanical impedance on root growth in barley. I. Effects on elongation and branching of seminal roots. J. Exp. Bot. 28, 96–111.Google Scholar
- 8.Kays S J, Nicklow C W and Simons D H 1974 Ethylene in relation to the response of roots to physical impedance. Plant and Soil 40, 565–571.Google Scholar
- 9.Morgan P W and Hall W C 1964 Accelerated release of ethylene by cotton following application of indolyl-3-acetic acid. Nature London 201, 99.Google Scholar
- 10.Pfeffer W 1896 Druck und Arbeitsleistung durch wachsende Pflanzen. Abh. Sächs. Ges. Wiss. 33, 235–474.Google Scholar
- 11.Ridge I 1973 The control of cell shape and rate of cell expansion by ethylene: effects on microfibril orientation and rate of cell expansion by ethylene: effects on microfibril orientation and cell wall extensibility in etiolated peas. Acta Bot. Neerl. 22, 144–158.Google Scholar
- 12.Russell R S 1971In Potential crop production. Ed. P F Wareing and J P Cooper. pp 100–116 Heineman Educational Books Ltd, London.Google Scholar
- 13.Russell R S and Goss M J 1974 Physical aspects of soil fertility — The response of roots to mechanical impedance. Neth. J. Agric. Sci. 22, 305–318.Google Scholar
- 14.Sargent J A, Atack A and Osborne D J 1973 Orientation of cell growth in etiolated pea stem. Effect of ethylene and auxin on cell wall deposition. Planta Berlin 109, 185–192.Google Scholar
- 15.Taylor H M and Ratliff L F 1969 Root growth pressures of cotton, peas and peanuts. Agron. J. 61, 398–402.Google Scholar
- 16.Veen B W 1970 Orientation of microfibrils in parenchynia cells of pea stem before and after longitudinal growth. Proc. Kon. Ned. Akad. Wet. C 73, 113–117.Google Scholar
- 17.Veen B W 1970 Control of plant cell shape by cell wall structure. Proc. Kon. Ned. Akad. Wet. C 73, 118–121.Google Scholar
- 18.Wilson A J, Robards A W and Goss M J 1977 Effects of mechanical impedance on root growth in barley. II. Effects on cell development in seminal roots. J. Exp. Bot. 28, 1216–1227.Google Scholar