Amelioration of Chilling Injury in Rice Seedlings by Mefluidide1
- L. X. Zhang,
- P. H. Li and
- M. J. Tseng2
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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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