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Hypoxic Treatment Decreases the Physiological Action of the Herbicide Imazamox on Pisum sativum Roots.
Plants ( IF 4.658 ) Pub Date : 2020-08-03 , DOI: 10.3390/plants9080981
Miriam Gil-Monreal 1 , Mercedes Royuela 1 , Ana Zabalza 1
Affiliation  

The inhibition of acetolactate synthase (ALS; EC 2.2.1.6), an enzyme located in the biosynthetic pathway of branched-chain amino acids, is the target site of the herbicide imazamox. One of the physiological effects triggered after ALS inhibition is the induction of aerobic ethanol fermentation. The objective of this study was to unravel if fermentation induction is related to the toxicity of the herbicide or if it is a plant defense mechanism. Pea plants were exposed to two different times of hypoxia before herbicide application in order to induce the ethanol fermentation pathway, and the physiological response after herbicide application was evaluated at the level of carbohydrates and amino acid profile. The effects of the herbicide on total soluble sugars and starch accumulation, and changes in specific amino acids (branched-chain, amide, and acidic) were attenuated if plants were subjected to hypoxia before herbicide application. These results suggest that fermentation is a plant defense mechanism that decreases the herbicidal effect.

中文翻译:

缺氧处理会降低除草剂Imazamox对豌豆(Pisum sativum)根的生理作用。

乙酰乳酸合酶(ALS; EC 2.2.1.6)(一种位于支链氨基酸生物合成途径中的酶)的抑制作用是除草剂咪唑胺的目标位点。ALS抑制后触发的生理效应之一是诱导好氧乙醇发酵。这项研究的目的是弄清发酵诱导是否与除草剂的毒性有关,或者是否是植物防御机制。豌豆植物在施用除草剂之前要经历两次不同的缺氧时间以诱导乙醇发酵途径,并在碳水化合物和氨基酸水平上评估了施用除草剂后的生理反应。除草剂对总可溶性糖和淀粉积累以及特定氨基酸(支链,酰胺,如果在施用除草剂之前对植物进行了低氧处理,则其减弱。这些结果表明发酵是降低除草作用的植物防御机制。
更新日期:2020-08-03
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