Weed Research (2008) 48, 448-454

T. Imaizumi, G.X. Wang and T. Tominaga (2008)
Inheritance of sulfonylurea resistance in Monochoria vaginalis
Weed Research 48 (5), 448-454
Abstract: The inheritance of sulfonylurea (SU) resistance in Monochoria vaginalis was investigated based on the bensulfuron-methyl response phenotypes of F₁ plants between SU-resistant (R) and -susceptible (S) and segregation analysis in F₂ progenies. Differences of SU resistance between SU-R biotypes and F₁ plants at the recommended field dose were also investigated by comparing shoot dry weight. All F₁ plants survived the treatment with 25 g a.i. ha⁻¹ bensulfuron-methyl, one-third of the recommended field dose, and showed similar responses to SU-R plants. Conversely, all F₁ plants died or showed extreme necrosis at 225 g a.i. ha⁻¹, three times the recommended field dose, as SU-S plants. F₂ plants were classified as either R or S phenotype. Segregation for resistance to bensulfuron-methyl in F₂ families did not differ from the expected 3:1 (R:S) ratio at 25 g a.i. ha⁻¹. At 225 g a.i. ha⁻¹, the F₂ families segregated in a 1:3 (R:S) ratio. These results suggest that SU resistance in M. vaginalis is controlled by a single nuclear allele with resistance being dominant at low dose and susceptibility dominant at high dose. Moreover, F₁ plants died or were extremely injured after application of bensulfuron-methyl at the recommended field dose, although SU-R biotypes grew normally.
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Link to article at publishers website
Database assignments for author(s): Toshiyuki Imaizumi, Tohru Tominaga

Research topic(s) for pests/diseases/weeds:
pesticide resistance of pest

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Monochoria vaginalis (weed)