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This article in AJ

  1. Vol. 73 No. 2, p. 383-385
     
    Received: May 21, 1980


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doi:10.2134/agronj1981.00021962007300020034x

Temperature Effect on the Inclination of Lateral Roots of Soybeans1

  1. T. C. Kaspar,
  2. D. G. Woolley and
  3. H. M. Taylor2

Abstract

Abstract

Genetic and environmental factors influence the size and shape of soybean (Glycine max (L.) Merr. root systems. Ten soybean lines were grown in sand culture at four different sand temperatures (10.0, 15.6, 21.1, and 26.7 C) to determine if temperature affects the angle of inclination of soybean lateral roots. The plants were grown in a growth chamber set for a constant air temperature (± 2.4 C) equal to the treatment temperature. The treatments were imposed until the unifoliate leaves had spread apart and unfolded. The sand was then washed from the roots, and a tracing on acetate was made of the root sysem, which was suspended in water at the time. The inclination of the lateral roots of each plant was determined from the acetate tracings by averaging the measured angles between the horizontal and the 10 up permost lateral roots. The effects of temperature, lines, and the interaction of temperature and lines were significant. The maximum angles of inclination occurred at either 26.7 or 21.1 C, and the minimum values at 10.0 C for most of the lines. ‘Hawkeye’ was not affected by temperature and had the largest angle of inclination averaged over the four temperature treatments. ‘Clark 63’ had the largest increase in the angle of inclination with an increase in temperature.

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