Abstract
The effect of temperature variation on the metabolic activity of simetryn [2, 4-bis (ethylamino)-6-methylthio-1, 3, 5-triazine] in rice cultivars Nihonbare (japonica-type, tolerant) and IR-8 (indica-type, susceptible) was investigated.Although the cultivar Nihonbare metabolized simetryn effectively to water-soluble and methanol-insoluble compounds, little difference was observed in the percentage of metabolic products between plants treated at a high temperature (32°C day and 27°C night) and at a low temperature (25°C day and 20°C night).The metabolic activity of cultivar IR-8 was much inferior to that of cultivar Nihonbare. There was also little difference in the percentage of metabolites in cultivar IR-8 between high and low temperature treatments.Temperature variation had little effect on the metabolic activity of the cultivars. It was concluded that the increased phytotoxicity of simetryn when the temperature was raised was the result of the increased absorption and translocation of the herbicide.
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