A herbicide antidote (safener) induces the activity of both the herbicide detoxifying enzyme and of a vacuolar transporter for the detoxified herbicide

FEBS Letters

Kreuz, Klaus²  Martinoia, Enrico³  Amrhein, Nikolaus¹  Gaillard, Cécile³  Tommasini, Roberto¹  Dufaud, Annie³ 

[1] Institute of Plant Sciences, Swiss Federal Institute of Technology, Zürich CH-8092 Zürich, Switzerland;Ciba Crop Protetction, Weed Control, Plant Biochemistry, CH-4002 Basel, Switzerland;Institut de Biologie de Beau Site Unité Associée CNRS 574, Université de Poitiers, 25 Rue du Faubourg Saint Cyprien, 86 000 Poitiers, France

关键词: Detoxification;    Herbicide;    Glucoside;    Glutathione;    Safener;    Transport;    Vacuole;    GST;    glutathione-S-transferase;    HPS-G;    hydroxy-primisulfuron-glucoside;    MOC-GS;    metolachlor-glutathione;   

DOI  :  10.1016/0014-5793(94)00961-9

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

In plants potentially toxic compounds are ultimately deposited in the large central vacuole. In this report we show that isolated barley mesophyll vacuoles take up the glucoside conjugate of the herbicide derivate [5-hydroxyphenyl]primisulfuron. Transport is stimulated by Mg-ATP and is distinct from that previously described for glutathione conjugates. Treatment of barley with different herbicide antidotes (safeners) revealed that the safener cloquintocet-mexyl doubles the vacuolar transport activities for both the glutathione and glucoside conjugates. Stimulation of the uptake of the metolachlor—glutathione conjugate was the result of an increased uptake velocity whereas the K _m remained unaltered, suggesting that the higher activity was due to a higher expression of the transporter. These results indicate that modulation of vacuolar transport activities are an integral part of the detoxification mechanism of plants.

【 授权许可】

Unknown