Abstract
AbstractIntact tobacco roots growing in nutrient solution spray in a sealed chamber were treated with mixtures of O2, N2, and CO2 gases. Oxygen and water uptake by roots and plant stem diameter were recorded.Anaerobic treatments produced by flushing roots with N2 or N2 plus 21% CO2 gases for 6 hours decreased water uptake 50% or more, but restoration of air to roots caused a rapid recovery of water uptake. Root injury was caused by both treatments, as evidenced by reduced oxygen uptake following each treatment. Gases with 1% or more oxygen had little or no effect on water uptake. Treatment gases containing up to 21% CO2 had the same effect on water uptake as treatment gases without CO2. Oxygen deficiency appears to be the primary cause of the initial decrease in water uptake and wilting of tobacco subjected to poor root aeration.
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