Basis for Antagonism by Sodium Bentazon of Tritosulfuron Toxicity to White Bean (Phaseolus vulgaris L.)

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• 作者：Tsafrir Weinberg ; Gerald R. Stephenson ; Michael D. McLean ; Norbert M. Satchivi ; J. Christopher Hall
• 刊名：Journal of Agricultural and Food Chemistry
• 出版年：2007
• 出版时间：March 21, 2007
• 年：2007
• 卷：55
• 期：6
• 页码：2268 - 2275
• 全文大小：882K
• 年卷期：v.55,no.6(March 21, 2007)
• ISSN：1520-5118

文摘

White bean (Phaseolus vulgaris L.) was used to study the antagonism caused by Na-bentazon onthe phytotoxic action of the sulfonylurea (SU) herbicide tritosulfuron. After 168 h, uptake andtranslocation of [¹⁴C]tritosulfuron were reduced by 60 and 89%, respectively, when Na-bentazon wasadded to the mixture. Addition of (NH₄)₂SO₄ or replacement of Na-bentazon with NH₄-bentazoncompletely eliminated the negative effects on [¹⁴C]tritosulfuron uptake but not on its translocation.Scanning electron microscopy revealed that a mixture of Na-bentazon plus tritosulfuron plus DASHHC (0.156%) formed a rough layer of grain-like crystals on the leaf surface, whereas the addition of(NH₄)₂SO₄ or replacement of Na-bentazon with NH₄-bentazon resulted in amorphous deposits thatmay be more easily absorbed. The antagonism of tritosulfuron's phytotoxicity by Na-bentazon involvestwo separate processes, chemical (uptake effect) and biochemical (translocation effect).