No apparent fitness costs associated with phytoene desaturase mutations conferred resistance to diflufenican and picolinafen in oriental mustard (Sisymbrium orientale L.)

文献类型： 外文期刊

第一作者： Hue Thi Dang

作者： Hue Thi Dang;Malone, Jenna Moira;Preston, Christopher;Gill, Gurjeet;Long, Weihua

作者机构：

关键词： Diflufenican resistance; CAPS; Single dominant gene; Fitness cost; Phytoene desaturase; PDS gene

期刊名称：PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY （ 影响因子：3.963； 五年影响因子：4.454 ）

ISSN： 0048-3575

年卷期： 2019 年 155 卷

页码：

收录情况： SCI

摘要： Two mutations Leu498 and Glu425 in the PDS gene were identified as the main cause conferring resistance to diflufenican and picolinafen in two oriental mustard populations P3 and P40. As mutations are suspected to affect fitness, this study was designed to test this hypothesis using the F-2 of two crosses P3.2 (P3 male x S female) and P40.5 (P40 male x S female) of oriental mustard. The F-2 plants, which segregated for target-site point mutations of PDS gene (Leu498 and Glu425) grown in monoculture and under competition with wheat in pot-trials and evaluated for growth and fecundity. All F2 individuals were genotyped by using Cleaved Amplified Polymorphic Sequence (CAPS) technique. Regression analysis showed no fitness cost in the resistant plants because no significant difference was identified in seed and biomass production within RR, RS and SS individuals. The absence of measurable negative effects on fitness associated mutations suggests that the frequency of the PDS resistance alleles will not decline in the absence of selection pressure of PDS-inhibitors.

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