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通过在立即可遗传变异范围内进行低剂量除草剂选择，使硬叶狗尾草产生进化的多基因除草剂抗性。

Evolved polygenic herbicide resistance in Lolium rigidum by low-dose herbicide selection within standing genetic variation.

机构信息

Australian Herbicide Resistance Initiative, School of Plant Biology, UWA Institute of Agriculture, University of Western Australia Crawley, WA, Australia.

出版信息

Evol Appl. 2013 Feb;6(2):231-42. doi: 10.1111/j.1752-4571.2012.00282.x. Epub 2012 Jul 12.

DOI:10.1111/j.1752-4571.2012.00282.x
PMID:23798973
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC3689349/
Abstract

The interaction between environment and genetic traits under selection is the basis of evolution. In this study, we have investigated the genetic basis of herbicide resistance in a highly characterized initially herbicide-susceptible Lolium rigidum population recurrently selected with low (below recommended label) doses of the herbicide diclofop-methyl. We report the variability in herbicide resistance levels observed in F1 families and the segregation of resistance observed in F2 and back-cross (BC) families. The selected herbicide resistance phenotypic trait(s) appear to be under complex polygenic control. The estimation of the effective minimum number of genes (N E), depending on the herbicide dose used, reveals at least three resistance genes had been enriched. A joint scaling test indicates that an additive-dominance model best explains gene interactions in parental, F1, F2 and BC families. The Mendelian study of six F2 and two BC segregating families confirmed involvement of more than one resistance gene. Cross-pollinated L. rigidum under selection at low herbicide dose can rapidly evolve polygenic broad-spectrum herbicide resistance by quantitative accumulation of additive genes of small effect. This can be minimized by using herbicides at the recommended dose which causes high mortality acting outside the normal range of phenotypic variation for herbicide susceptibility.

摘要

环境与受选择遗传特征的相互作用是进化的基础。在这项研究中，我们调查了经过低剂量（低于推荐标签剂量）的除草剂二甲四氯甲酯反复选择的高度特征化的最初对除草剂敏感的硬羊茅种群中除草剂抗性的遗传基础。我们报告了在 F1 家系中观察到的除草剂抗性水平的可变性以及在 F2 和回交（BC）家系中观察到的抗性分离。所选的除草剂抗性表型特征似乎受到复杂的多基因控制。根据所用除草剂剂量估算的有效最小基因数 (N E ) 表明，至少有三个抗性基因已经得到了富集。联合比例检验表明，加性-显性模型最能解释亲本、F1、F2 和 BC 家系中的基因相互作用。对六个 F2 和两个 BC 分离家系的孟德尔研究证实，涉及多个抗性基因。在低除草剂剂量下进行选择的异花授粉硬羊茅可以通过小效应加性基因的定量积累快速进化为多基因广谱除草剂抗性。通过使用推荐剂量的除草剂可以将其最小化，因为推荐剂量的除草剂会导致高死亡率，作用超出了除草剂敏感性的表型变异正常范围。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6ace/3689349/821c1ff7e87a/eva0006-0231-f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6ace/3689349/7c7a09ed8aa8/eva0006-0231-f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6ace/3689349/0257d49cd0f1/eva0006-0231-f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6ace/3689349/821c1ff7e87a/eva0006-0231-f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6ace/3689349/7c7a09ed8aa8/eva0006-0231-f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6ace/3689349/0257d49cd0f1/eva0006-0231-f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6ace/3689349/821c1ff7e87a/eva0006-0231-f3.jpg

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