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首页> 外文期刊>Journal of Agricultural and Food Chemistry >Effects of isoxazole herbicides on protoporphyrinogen oxidase and porphyrin physiology.
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Effects of isoxazole herbicides on protoporphyrinogen oxidase and porphyrin physiology.

机译：异恶唑除草剂对原卟啉原氧化酶和卟啉生理的影响。

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摘要

The biochemical and physiological effects of 10 isoxazoles were investigated in Ipomoea spp., Abutilon theophrasti, Echinochloa crus-galli and barley. The amount of protoporphyrin IX caused to accumulate by the compounds correlated well with their herbicidal activity. Protoporphyrinogen oxidase (Protox) was inhibited competitively in the proximity of the catalytic site. However, the Protox I50 values of the methyl esters and acid chloride derivatives were lower than expected on the basis of their in vivo herbicidal activity. The results suggest that some tolerance mechanism, other than differential absorption and translocation, may protect the plants against these compounds. The molecular properties of 9 isoxazoles and 2 other well-known inhibitors of different herbicide groups were compared to those of protoporphyrinogen (Protogen). The most active compounds have similar bulk, electronic, and energy properties that approximate half of the Protogen molecule. Furthermore, these compounds have atoms/groups on the ring that generate distinct negative electrostatic potential fields that may mimic the reactive part of the Protogen molecule.
机译：研究了10种异恶唑的生物化学和生理学效应，它们分别存在于番薯属，Ab麻、,菜和大麦中。该化合物导致积累的原卟啉IX的量与其除草活性紧密相关。原卟啉原氧化酶（Protox）在催化位点附近受到竞争性抑制。但是，基于其体内除草活性，甲酯和酰氯衍生物的Protox I50值低于预期。结果表明，除差异吸收和转运以外，某些耐受机制还可以保护植物免受这些化合物的侵害。比较了9种异恶唑和2种其他已知的不同除草剂抑制剂的分子特性与原卟啉原（Protogen）的分子特性。活性最高的化合物具有相似的体积，电子和能量性质，大约是原分子的一半。此外，这些化合物在环上具有原子/基团，该原子/基团产生独特的负静电势场，其可以模仿原始分子的反应性部分。

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