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Chilling Injury in Cotton Seedlings: Changes in Permeability of Cotyledons¹

Chilling at 5C caused cotton seedlings (Gossypium hirsutum L.) to wilt and apparently increased permeability of cotyledonary membranes. Chilling greatly increased the amounts of reducing sugars, ninhydrin-positire material, and ionic material which subsequently leached from cotyledons when they were floated in 0.2M mannitol after the chilling treatment. Permeability did not increase until seedlings were chilled for at least 3 hr. Moisture stress, caused by decreased water uptake at low root temperature, may have affected permeability of cotyledons. Cold-hardened seedlings, upon chilling, showed less visible injury and less leakage from cotyledons than control seedlings.

Key Words: Cold-hardening • Dehydration • Desiccation • Leakage • Membranes

² Plant Physiologist, Crops Research Division. Present address: Western Cotton Research Laboratory, 4135 E. Broadway, Phoenix, Az. 85040.

Received for publication July 24, 1970.