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首页> 外文期刊>Weed Science >Absorption, Translocation, and Metabolism of Imazethapyr in Common Ragweed (Ambrosia artemisiifolia) and Giant Ragweed (Ambrosia trifida)
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Absorption, Translocation, and Metabolism of Imazethapyr in Common Ragweed (Ambrosia artemisiifolia) and Giant Ragweed (Ambrosia trifida)

机译：甲草胺在普通豚草（Ambrosia artemisiifolia）和巨型豚草（Ambrosia trifida）中的吸收，转运和代谢。

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Common and giant ragweed are important weeds of soybeans in Indiana. These two weeds respond differently to imazethapyr POST treatments with common ragweed demonstrating more tolerance than giant ragweed. Both plants show initial susceptibility to imazethapyr, but common ragweed can regrow 10 to 14 days following herbicide application. Laboratory studies were conducted to determine the factors that contribute to the differential control of common and giant ragweed with imazethapyr. Differential absorption was observed at 72 h, with common ragweed absorbing 52% of the applied ~(14)C-imazethapyr and giant ragweed absorbing 39%. The absorption of radioactivity was the same for both species by 672 h. Imazethapyr exhibited both xylem and phloem mobility by translocating both acropetally and basipetally from a treated leaf in giant and common ragweed. A higher percentage of the absorbed radioactivity accumulated in the lower foliage and roots of giant ragweed than common ragweed by 336 h. The rate of imazethapyr metabolism in common ragweed was greater than in giant ragweed. At 336 h, 81 and 68% of the identified radioactivity in the treated leaf was imazethapyr metabolites in common and giant ragweed, respectively. A higher level of the inactive glucose conjugate metabolite was found in the lower plant and root tissues of common ragweed than in giant ragweed. The differential control of common and giant ragweed with foliar applications of imazethapyr was attributed to differences in both translocation and metabolism. Nomenclature: Imazethapyr, 2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-5-ethyl-3-pyridinecarboxylic acid; common ragweed, Ambrosia artemisiifolia L. #~3 AMBEL; giant ragweed, Ambrosia trifida L. # AMBTR.
机译：普通豚草和巨型豚草是印第安纳州重要的大豆杂草。这两种杂草对常见的豚草对咪唑乙烟后处理的反应不同，表现出比大型豚草更大的耐受性。两种植物均显示出对咪唑乙烟的初始易感性，但普通豚草在施用除草剂后可再生长10至14天。进行了实验室研究，以确定有助于与咪唑乙烟碱对普通豚草和巨型豚草进行差异控制的因素。在72 h时观察到差异吸收，普通豚草吸收了〜（14）C-咪唑吡虫的52％，巨型豚草吸收了39％。到672小时，两种物质的放射性吸收相同。咪唑乙烟通过从处理过的叶片中的杂草和杂草中进行顶位和底位转移，从而表现出木质部和韧皮部的活动性。到336小时时，在大型豚草的下叶和根中积累的吸收放射性百分比高于普通豚草。普通豚草的咪唑乙烟碱代谢速率大于大型豚草。在336 h，处理过的叶片中发现的81和68％的放射性分别是普通豚草和巨型豚草中的咪唑乙烟碱代谢产物。在常见豚草的下部植物和根部组织中，发现的非活性葡萄糖结合物代谢物水平高于大型豚草。叶状喷施咪唑乙烟对普通豚草和巨型豚草的差异控制归因于易位和代谢的差异。命名：咪唑乙烟碱，2- [4,5-二氢-4-甲基-4-（1-甲基乙基）-5-氧代-1H-咪唑-2-基] -5-乙基-3-吡啶羧酸；豚草，Ambrosia artemisiifolia L.＃〜3 AMBEL;巨型豚草，Ambrosia trifidaL。

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