Abstract
Morphological plasticity of wheat root systems for different soil moisture were examined with reference to their water absorption. Wheat seeds were planted in acrylic tubes filled with fertilized soil having different water contents. At 28 days after planting, plants in the lower soil moisture plots had shorter but more branched seminal roots, and the ratio of total root length to total leaf area was larger. The transpiration rate per unit leaf area after rehydration was positively correlated to the ratio of total root length to total leaf area. However, the transpiration rate of plants in the driest condition was relatively small in spite of developed root branching. The morphological response of wheat roots to soil moisture should be significantly adaptable for water uptake except when subjected to severe drought stress.
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