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Inheritance and linkage of metabolism-based herbicide cross-resistance in rigid ryegrass (Lolium rigidum)

  • Christopher Preston (a1)

The inheritance and linkage of enhanced metabolism-based herbicide cross-resistance was examined in a multiple resistant population of rigid ryegrass. F1 hybrids between resistant and susceptible populations showed an intermediate response to all the four herbicides tested, with no indication of maternal inheritance. Segregation of F2 families fitted a single-gene model for resistance to simazine, chlorotoluron, and chlorsulfuron. But there was more than the expected mortality from the low dose of tralkoxydim. Segregating F2 populations were selected by high rates of each of the four herbicides to create selected F2 families. Analysis of the response of these families demonstrated that simazine resistance is linked to chlorotoluron resistance. No other herbicide resistances were linked. Therefore, in this population of rigid ryegrass, at least three separate genes are responsible for metabolism-based cross-resistance. This study shows that multiple herbicide resistance in rigid ryegrass is the result of accumulation of a number of different resistance genes.

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P. Boutsalis , J. Karotam , and S. B. Powles 1999. Molecular basis of resistance to acetolactate synthase-inhibiting herbicides in Sisymbrium orientale and Brassica tournefortii. Pestic. Sci. 55:507516.

B. Chauvel and J. Gasquez 1994. Relationships between genetic polymorphism and herbicide resistance within Alopecurus myosuroides Huds. Heredity 72:336344.

I. Heap and R. Knight 1986. The occurrence of herbicide cross-resistance in a population of annual ryegrass, Lolium rigidum, resistant to diclofop-methyl. Aust. J. Agric. Res. 37:149156.

I. M. Heap and R. Knight 1990. Variation in herbicide cross-resistance among populations of annual ryegrass (Lolium rigidum) resistant to diclofop-methyl. Aust. J. Agric. Res. 41:121128.

C. Preston , F. J. Tardif , J. T. Christopher , and S. B. Powles 1996a. Multiple resistance to dissimilar herbicide chemistries in a biotype of Lolium rigidum due to enhanced activity of several herbicide degrading enzymes. Pestic. Biochem. Physiol. 54:123134.

C. Preston , F. J. Tardif , and S. B. Powles 1996b. Multiple mechanisms and multiple herbicide resistance in Lolium rigidum. Pages 117129 In T. M. Brown , ed. Molecular Genetics and Evolution of Pesticide Resistance. Washington, DC: American Chemical Society.

F. J. Tardif , C. Preston , J.A.M. Holtum , and S. B. Powles 1996. Resistance to acetyl-coenzyme A carboxylase-inhibiting herbicides endowed by a single major gene encoding a resistant target site in a biotype of Lolium rigidum. Aust. J. Plant Physiol. 23:1523.

L. Zeng and W. V. Baird 1997. Genetic basis of dinitroaniline resistance in a highly resistant biotype of goosegrass (Eleusine indica). J. Hered. 88:427432.

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Weed Science
  • ISSN: 0043-1745
  • EISSN: 1550-2759
  • URL: /core/journals/weed-science
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