Molecular basis of cross-resistance to acetohydroxy acid synthase-inhibiting herbicides in Sagittaria trifolia L.
Pestic Biochem Physiol
; 173: 104795, 2021 Mar.
Article
en En
| MEDLINE
| ID: mdl-33771266
ABSTRACT
Acetohydroxy acid synthase (AHAS)-inhibiting herbicides are one of the most commonly used herbicides for controlling the growth of Sagittaria trifolia L. in paddy fields in Northeastern China. In this study, we collected five suspected resistant populations of S. trifolia (R1-R5) from three different provinces of Northeastern China. The results of whole-plant bioassays revealed that those populations showed high level of resistance to bensulfuron-methyl with resistance index (GR50 R/S) ranging from 39.90 to 88.50. The results of AHAS-activity assays were consistent with the results of the whole-plant bioassays. The AHAS gene analysis showed that R2 and R3 populations contained Pro-197-Leu mutations that were highly resistant to penoxsulam; R1 and R4 populations contained Pro-197-Ser mutations that were highly resistant to bispyribacsodium; R5 population contained Trp-574-Leu mutation that showed high resistance to IMI, PT, PTB and SU herbicides. The AHAS with resistance mutations showed less sensitivity to feedback inhibition by BCAAs and R genotypes had increased free BCAAs.
Palabras clave
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Acetolactato Sintasa
/
Sagittaria
/
Herbicidas
País/Región como asunto:
Asia
Idioma:
En
Revista:
Pestic Biochem Physiol
Año:
2021
Tipo del documento:
Article
País de afiliación:
China