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

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.

Key Words: Internal plant aeration • Root porosity • Leaf area duration • Net assimilation rate

² Rescarch Assistant and Professor of Soil Physics, Department of Soils and Plant Nutrition, University of California, Riverside 92502.

Received for publication June 15, 1968.