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Prevention of Chilling Injury to Seedling Cotton with Anti-Transpirants¹

Emerged cotton (Gossypium hirsutum L.) seedlings are severely damaged or killed by temperatures below 10 C. Prolonged chilling induces severe foliar water deficit as a consequence of root water uptake inhibition which causes cotyledonary necrosis, growth retardation or death of seedlings. We tested, under controlled environment, the efficacy of antitranspirant treatments in maintenance of seedling water status, and preventation of chilling injury by high humidity or by antitranspirant treatments. The antitranspirant treatments reduced seedling water loss to approximately 40%. Maintenance of seedling watex status by ambient high humidity or antitranspirant sprays reduced seedling death and cold stress inhibition of subsequent growth. Field experimentation with antitranspirants is suggested to provide means of reducing farm loss of cotton stands.

Key Words: Gossypium hirsutum L. • Desiccation • Cold stress

² Plant physiologists.

Received for publication April 24, 1978.