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Amelioration of Chilling Injury in Rice Seedlings by Mefluidide¹

Rice (Oryza sativa L.) seedlings at two to three leaf stage were used for testing mefluidide (/V-[2,4-dimethyl-5-[[(trifluoromethyl)- sulfonyl)amino]phenyl]acetamide) protection of chilled plants. After 8-days exposure to 6°C, seedlings sprayed with 3, 5,10, and 15 mg mefluidide L^–1 had 29,30,29, and 31% injury, respectively. Controls showed > 65% damage. During the 8-day chilling period, consistent levels of about 30% electrolyte leakage were observed among the mefluidide-treated plants, whereas controls showed an increase in leakage from 30 to 70%. It appears that mefluidide may alter plasma membrane properties and thus lead to increased tolerance to chilling stress. Significant protection was apparent 6 h after mefluidide treatment. Protection can last for at least 72 h after treatment. Chilled, mefluidide-treated plants grew taller and flowered 5 to 10 days earlier than chilled controls. Although high concentrations of mefluidide can stunt plant growth, at concentrations of 5 to 10 mg L^–1 rice plants did not exhibit any adverse growth and development characteristics. A 5 mg mefluidide L^–1 application appeared to stimulate plant growth in a nonstressed environment.

Key Words: Oryza sativa L. • Chilling protection • Electrolyte leakage • Plasma membrance properties

² Visiting scientist from Chinese Academy of Agric. Sci., Jilin, China; professor, and graduate assistant, respectively, of the Dep. of Horticultural Science and Landscape Architecture, Univ. of Minnesota, Correspondence should be addressed should addressed to second author.

Received for publication August 14, 1986.