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Influence of Environment on Metabolism of Propanil in Rice

Published online by Cambridge University Press:  12 June 2017

Richard H. Hodgson
Richard H. Hodgson*
Affiliation:
Metabolism and Radiation Research Laboratory, Crops Res. Div. Agr. Res. Ser., U. S. Dep. of Agr., Fargo, North Dakota 58102
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Abstract

The metabolism of 3′,4′-dichloropropionanilide (propanil) to 3,4-dichloroaniline (hereinafter referred to as 3,4-DCA) and N-(3,4-dichlorophenyl)glucosylamine (hereinafter referred to as 3,4-DCAG) was quantitatively modified in rice (Oryza sativa L. ‘Nato’) by temperature and day length. The propanil, 3,4-DCA, and 3,4-DCAG content of rice was determined 1, 2, 5, and 8 days after root treatment with 92 μM propanil. Plants were grown and treated under long-day (16 hr) and short-day (12 hr) conditions with day temperatures of 32, 27, or 21 C and night temperatures of 21 C. Absorption and metabolism of propanil were most rapid under high temperature and long day conditions. A mean value of 0.75 μmoles total of aniline equivalent per plant was obtained. Greater quantities of 3,4-DCA and 3,4-DCAG were recovered from plants in high temperature, long day environments. An average of 47% of the propanil plus water-soluble metabolites in rice was in root tissue. Conditions favoring high growth rates and transpiration increased the percentage in the shoots. Because of the increased tissue mass at high temperatures, mean concentrations of propanil plus water-soluble metabolites in plant tissue were reduced from 0.18 to 0.12 μmoles/g dry weight.

Type
Research Article
Information
Weed Science , Volume 19 , Issue 5 , September 1971 , pp. 501 - 507
Copyright
Copyright © Weed Science Society of America 

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