Abstract
Mefluidide, a synthetic plant growth regulator, has been reported to protect chilling-sensitive plants from chilling damage and enhance the freezing tolerance of certain winter-hardy herbaceous plants. The potential of mefluidide to enhance the freezing tolerance of nonhardened and dehardening cabbage (Brassica oleracea L. Capitata Group) leaf tissue was investigated. Mefluidide at 0 to 60 mg·L–1 was tested on `Brunswick' and `Golden Acre' cabbage in five experiments. Leaf tissue freezing tolerance was measured 3 to 9 days postapplication by electrolyte leakage assay. The interval between application and freeze testing had no effect on leaf freeze tolerance. The effect of mefluidide at low rates on leaf freeze tolerance was small and inconsistent. At 30 and 60 mg·L–1, leaf freeze tolerance was decreased consistently. Chemical name used: N-{2,4-dimethyl-5-[[trifluromethyl)sulfonyl]amino]phenyl}acetamide (mefluidide).
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