Young plants of 5 woody-plant species ( Fouquieria splendens, Parkinsonia aculeata, Prunus persica, Robinia pseudoacacia, and Rosa sp.) were grown in soil in clear, polyvinyl tubes. Roots were exposed to 30°–60°C soil temperatures for 4- or 6-hr once or on 2 or 4 successive days. Five stages of plant response occurred. A given response did not vary more than 5°C for the 5 species. These plant responses to high soil temperatues could account for the loss of roots in metal nursery containers exposed to the sun.
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Wong et al. (1971) studied this question.
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