Trifoliin — Rhizobium trifolii interaction and its inhibition by herbicides and their corresponding metabolites

Sigmund J. Huber, Peter R. Wallnöfer
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引用次数: 1

Abstract

The effect of the phenylurea herbicides linuron, monolinuron, metobromuron, and the phenoxyalkanoic acid herbicides 2,4-D and 2,4,5-T as well as their corresponding aromatic metabolites 3,4-dichloro-, 4-chloro-, 4-bromoaniline, 2,4-dichloro-, and 2,4,5-trichlorophenol on the agglutination of Rhizobium trifolii was tested with a trifoliin containing seed extract of white clover (Trifolium repens).

The herbicides tested did not effect the agglutination up to concentrations as high as their water solubility. However, the chloro-or bromoanilines showed an inhibitory effect on agglutination at concentrations ranging from 16 to 25 mM. 2,4-Dichloro- and 2,4,5-trichlorophenol inhibited the agglutination even in concentrations of 2 and 1 mM, respectively. All metabolites were effective after preincubation of the seed extract, since they damaged the glycoprotein trifoliin. The compounds did not influence the lectin-binding polysaccharide formation at the cell surface. HgCl2 treated cells, cells harvested in the stationary and log phase or grown in the presence of 0.2 mM 2,4-dichlorophenol and 0.1 mM 2,4,5-trichlorophenol, respectively, agglutinated without any differences in the test system used.

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三叶草苷与三叶草根瘤菌的相互作用及其对除草剂及其代谢物的抑制作用
以含有三叶草种子提取物的白三叶草(Trifolium repens)为原料,研究了苯脲类除草剂linuron、monolinuron、metobromuron和苯氧烷酸类除草剂2,4-d和2,4,5-t及其芳香代谢物3,4-二氯-、4-氯-、4-溴苯胺、2,4-二氯-和2,4,5-三氯苯酚对三叶草根瘤菌的凝集作用。所测试的除草剂对凝集的影响并没有达到其水溶性的浓度。然而,氯苯胺和溴苯胺在16 ~ 25 mM的浓度范围内对凝集有抑制作用,2,4-二氯和2,4,5-三氯苯酚在2和1 mM的浓度范围内对凝集也有抑制作用。所有代谢物在种子提取物预孵育后都有效,因为它们破坏了糖蛋白三叶磷脂。这些化合物不影响细胞表面凝集素结合多糖的形成。HgCl2处理的细胞,在固定期和对数期收获的细胞,或分别在0.2 mM 2,4-二氯苯酚和0.1 mM 2,4,5-三氯苯酚存在下生长的细胞,在使用的测试系统中没有任何差异。
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