Untitled

Glover, D. G.; Schapaugh, William T.

doi:10.1023/a:1016078011794

Cited by 6 publications

(1 citation statement)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Furthermore, the inheritance of pendimethalin resistance in soybean cultivars was found to be under quantitative genetic control (). These studies ( , ) support the notion that MCPA resistance in hemp-nettle may be a quantitative trait. Such polygenic resistance mechanisms likely evolve under moderate selection pressures ().…”

Section: Resultssupporting

confidence: 78%

MCPA (4-Chloro-2-ethylphenoxyacetate) Resistance in Hemp-nettle (Galeopsis tetrahit L.)

Weinberg

Stephenson

McLean

et al. 2006

J. Agric. Food Chem.

View full text Add to dashboard Cite

The physiological basis for MCPA resistance in a hemp-nettle (Galeopsis tetrahit L.) biotype, obtained from a MCPA-resistant field population, was investigated. Dose-response studies revealed that the resistance factor for MCPA, based on GR50 comparisons of total dry weight of resistant (R) and susceptible (S) plants, was 3.3. Resistance factors for fluroxypyr, dicamba, 2,4-D, glyphosate, and chlorsulfuron were 8.2, 1.7, 1.6, 0.7, and 0.6, respectively. MCPA resistance was not due to differences in absorption, because both R and S biotypes absorbed 54% of applied [14C]MCPA 72 h after treatment. However, R plants exported less (45 vs 58% S) recovered 14C out of treated leaves to the apical meristem (6 vs 13% S) and root (32 vs 38% S). In both biotypes, approximately 20% of the 14C recovered in planta was detected as MCPA metabolites. However, less of the 14C recovered in the roots of R plants was MCPA. Therefore, two different mechanisms protect R hemp-nettle from MCPA phytotoxicity: a lower rate of MCPA translocation and a higher rate of MCPA metabolism in the roots. In support of these results, genetic studies indicated that the inheritance of MCPA resistance is governed by at least two nuclear genes with additive effects.

show abstract

Section: Resultssupporting

confidence: 78%

MCPA (4-Chloro-2-ethylphenoxyacetate) Resistance in Hemp-nettle (Galeopsis tetrahit L.)

Weinberg

Stephenson

McLean

et al. 2006

J. Agric. Food Chem.

View full text Add to dashboard Cite

show abstract

Fitness costs linked to dinitroaniline resistance mutation in Setaria

Darmency¹,

Picard²,

Wang

2011

Heredity

View full text Add to dashboard Cite

A mutant Thr-239-Ileu at the a2-tubulin gene was found to confer resistance to dinitroanilines, a family of mitosisdisrupting herbicides. However, mutations affecting microtubule polymerization and cell division are expected to impact growth and reproduction, that is, the fitness of a resistant weed or the yield of a tolerant crop, although it has not been demonstrated yet. This study was designed to test this hypothesis for the growth and reproduction of nearisogenic resistant and susceptible materials that were created in F 2 and F 3 generations after a Setaria viridis x S. italica cross. Differential growth was noticeable at the very onset of seedling growth. The homozygous resistant plants, grown both in a greenhouse cabinet and in the field, were smaller and had lower 1000-grain weight and therefore a lower yield. This fitness penalty is certainly due to modified cell division kinetics. Although the presence of the mutant allele accounted for 20% yield losses, there were also measurable benefits of dinitroaniline resistance, and these benefits are discussed.

show abstract