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Influence of Temperature, Light Intensity, and Aeration on Growth and Root Porosity of Wheat, Triticum aestivum¹

Synopsis: Influence of three energy levels and two oxygen concentrations on the growth and root porosity of. ‘Sonora 64’ and ‘Naineri’ wheats wag studied in an environmental control chamber. Energy levels included three temperatures and three light intensities.

The dry weights of shoot and root, volume of roots, and number of tillers were adversely affected by low oxygen supply and low energy input. Increased root porosity under low O₂ supply suggests that gas space development in wheat is closely related to anaerosis. An increase in gas space development occurred under conditions of higher rates of growth. When temperatures were high, low oxygen supply was more detrimental toshoot and root growth.

Optimum temperature was 25 C for both varieties, although Naineri variety was more responsive to temperature and light intensity. Amounts of water consumed was higher when high temperature and light intensity prevailed. Water use was higher under low oxygen supply than under well-aerated plants. Water use also appears to be related to gas space in roots.

Key Words: Root growth • Oxygen

² Lecturer, Indian Institute of Technology, Kharagpur, India Professors of Soil Physics, Department of Soils and Plant Nutrition.

Received for publication December 2, 1969.