Stability of EPSPS gene copy number in Hordeum glaucum Steud (barley grass) in the presence and absence of glyphosate selection.
Pest Manag Sci
; 77(7): 3080-3087, 2021 Jul.
Article
in En
| MEDLINE
| ID: mdl-33729658
ABSTRACT
BACKGROUND:
Gene amplification has been shown to provide resistance to glyphosate in several weed species, including Hordeum glaucum populations in South Australia. The stability of 5-enolpyruvylshikimate-3-phosphate synthase (EPSPS) gene copies in resistant populations in the presence or absence of glyphosate selection has not been determined.RESULTS:
Applying glyphosate to a cloned plant resulted in an increase in resistance and EPSPS copy number in the progeny of that plant compared to the untreated clone. The LD50 (herbicide concentration required for 50% mortality) increased by 75% to 79% in the progeny of the treated clones compared to the untreated in both populations (YP-17 and YP-16). EPSPS copy number estimates were higher in treated individuals compared to untreated individuals with an average of seven copies compared to six in YP-16 and 11 compared to six in YP-17. There was a positive correlation (R2 = 0.78) between EPSPS copy number and LD50 of all populations.CONCLUSION:
EPSPS gene copy number and resistance to glyphosate increased in H. glaucum populations under glyphosate selection, suggesting the number of EPSPS gene copies present is dependent on glyphosate selection. © 2021 Society of Chemical Industry.Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Hordeum
/
Gene Dosage
/
3-Phosphoshikimate 1-Carboxyvinyltransferase
/
Herbicides
Country/Region as subject:
Oceania
Language:
En
Journal:
Pest Manag Sci
Journal subject:
TOXICOLOGIA
Year:
2021
Document type:
Article
Affiliation country:
Australia