Abstract：
:The evolution of resistant weed populations in response to intensive herbicide selection pressure is a global issue. Resistance to post-emergence herbicides is widespread, whereas soil-applied pre-emergence herbicides can often remain effective. For example, in Australia pyroxasulfone is a new pre-emergence soil-applied herbicide which provides control of Lolium rigidum populations resistant to multiple post-emergence herbicide modes of action. A fundamental knowledge of the genetic basis of metabolic resistance in weeds is important for understanding plant evolution pathways under herbicide selection and sustaining long-term weed resistance management. In this study we define the mechanistic basis of resistance to pyroxasulfone in a L. rigidum population. TLC provides evidence that pyroxasulfone resistance is metabolism-based with approximately 88% of parental [14C]-labelled pyroxasulfone metabolized in resistant plants 24 h after the herbicide treatment. HPLC-MS allowed identification of several metabolites of pyroxasulfone formed via a glutathione (GSH) conjugation pathway in pyroxasulfone-resistant L. rigidum plants. However, the initial pyroxasulfone-glutathione conjugate was not found likely due to its labile nature. The observed constitutive over-expression from six to nine-fold of two putative resistance-endowing GST genes was associated with the pyroxasulfone resistance phenotype. The most logical conclusion, based on the data thus far available, is that rapid detoxification of pyroxasulfone mediates pyroxasulfone resistance in L. rigidum plants. Future research is warranted to confirm the hypothesis advanced by this study of rapid pyroxasulfone metabolism due to GSH conjugation mediated by GST over-expressed in pyroxasulfone-resistant plants which similarly leads to the production of distinctive GSH-pyroxasulfone metabolites in L. rigidum and wheat.
journal_name
Pestic Biochem Physioljournal_title
Pesticide biochemistry and physiologyauthors
Busi R,Porri A,Gaines TA,Powles SBdoi
10.1016/j.pestbp.2018.03.017subject
Has Abstractpub_date
2018-06-01 00:00:00pages
74-80eissn
0048-3575issn
1095-9939pii
S0048-3575(17)30452-2journal_volume
148pub_type
杂志文章abstract：:Anthracnose disease in the cotton plant caused by fungal pathogen Colletotrichum gossypii. It is supposed to be most critical diseases in the cotton crop as it causes infection and leads to complete damaging of the cotton crop by infecting the leaves, stems, and bolls in the field. The disease control is challenging d...
journal_title：Pesticide biochemistry and physiology
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journal_title：Pesticide biochemistry and physiology
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pub_type： 杂志文章
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更新日期：2016-06-01 00:00:00
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journal_title：Pesticide biochemistry and physiology
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journal_title：Pesticide biochemistry and physiology
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journal_title：Pesticide biochemistry and physiology
pub_type： 杂志文章,评审
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更新日期：2019-06-01 00:00:00
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journal_title：Pesticide biochemistry and physiology
pub_type： 杂志文章,评审
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journal_title：Pesticide biochemistry and physiology
pub_type： 杂志文章
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更新日期：1996-05-01 00:00:00
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journal_title：Pesticide biochemistry and physiology
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journal_title：Pesticide biochemistry and physiology
pub_type： 杂志文章
doi：10.1016/j.pestbp.2014.07.010
更新日期：2014-10-01 00:00:00
abstract：:The two-spotted spider mite Tetranychus urticae is a serious pest of many agricultural crops and ornamental plants. The sublethal effects of a new chemical, spinetoram, on T. urticae were investigated by treating adult females and eggs with LC10 and LC20 in the laboratory. The data were assessed based on age-stage, tw...
journal_title：Pesticide biochemistry and physiology
pub_type： 杂志文章
doi：10.1016/j.pestbp.2016.02.002
更新日期：2016-09-01 00:00:00
