Relative Fitness of Acetyl-CoA Carboxylase susceptible and resistant Alopecurus myosuroides biotypes: germinability and seedling pre-emergence growth under salinity and drought stress conditions

Document Type : Research Paper

Authors

1 Department of Agronomy, Faculty of Agriculture, Tarbiat Modares University, P.O. Box: 14115-336, Tehran, Iran

2 University of Tarbiat Modares

3 Department of Agroecology, Aarhus University, Forsøgsvej 1, DK-4200, Slagelse, Denmark

Abstract

Fitness costs of herbicide resistance may be more evident and increase under stress environmental conditions. To test this hypothesis, a herbicide-resistant (R) and a herbicide-susceptible (S) phenotype with controlled and homogenized genetic background were isolated within a non–target-site resistant (NTSR) black-grass population. Accumulated maximum germination (Gmax) and time to reach the Gmax(G50) of biotypes were examined under non-stress and abiotic-stress conditions (salinity at 16 dSm-1, drought at -0.8 Mpa). In addition, seedling pre-emergence biotypes growths were evaluated under non-stress condition. There was no difference in Gmaxbetween the R and S biotypes, whereas the Gmaxof R phenotype was 28% and 49% lower than that of the S phenotype under salinity- and drought-stress conditions, respectively. The R phenotype germinated around seven to 16 hours later than the S phenotype under all non-stress and abiotic-stress conditions, i.e. the R phenotype had higher G50 than the other phenotype. The experiments of seedling pre-emergence growth showed that the R and S biotypes had similar root and shoot length under non-stress condition. The results clearly showed that the germinability fitness costs of NTSR black-grass increase when the plants are grown under salinity and drought stress conditions.

Keywords


 
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