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This article in AJ

  1. Vol. 61 No. 2, p. 202-204
     
    Received: June 15, 1968


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doi:10.2134/agronj1969.00021962006100020009x

Root Porosity and Growth Responses of Rice and Maize to Oxygen Supply

  1. R. J. Luxmoore and
  2. L. H. Stolzy2

Abstract

Abstract

Rice (Oryza sativa L.) and maize (Zea mays L.) plants were grown in Hoagland solution culture maintained at 7.5 ppm and 0.7 ppm oxygen under artificial illumination.

Adventitious roots were generally more porous than the primary root system and were the larger proportion of the roots after about 30 days growth, indicating that adventitious roots could have considerable significance in internal aeration.

No effect of solution O2 concentration on root porosity of rice or maize was observed, suggesting that gas space development may be less dependent on anaerosis than has been supposed in the literature.

For rice, the dry weight was higher at the lower O2 concentration, whereas growth analysis of maize showed that at the lower O2 concentration the dry weight was lower; this was associated with decreases in both leaf area duration and net assimilation rate.

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