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Rapid necrosis: a novel plant resistance mechanism to 2,4-D
- Source :
- Weed Science. :1-13
- Publication Year :
- 2019
- Publisher :
- Cambridge University Press (CUP), 2019.
-
Abstract
- Plants of Sumatran fleabane [Conyza sumatrensis (Retz.) E. Walker] were identified in a field with an unusual rapid leaf-injury herbicide symptoms after application of 2,4-D in mixture with glyphosate. The objectives of this study were to confirm the occurrence of resistance to 2,4-D herbicide and to characterize the occurrence of rapid necrosis as the mechanism associated with the herbicide resistance in C. sumatrensis. The studies performed were an initial screening, effect of 2,4-D alone and associated with glyphosate, cross- and multiple-resistance evaluation, effect of commercial formulation and analytical product, and rate of H2O2 evolution. The Marpr9-rn accession was identified with rapid necrosis symptoms and survival to 804 g ae ha−1 of 2,4-D. The resistance factor to the herbicide 2,4-D was 18.6 at 49 d after spraying. The analytical product 2,4-D and the commercial formulation resulted in similar symptoms of rapid necrosis. This symptom did not occur for the six other auxinic herbicides (dicamba, florpyrauxifen-benzyl, fluroxypyr, halauxifen-methyl, picloram, and triclopyr), indicating absence of cross-resistance. Multiple resistance to the herbicides paraquat, saflufenacil, and ammonium glufosinate was not identified in the Marpr9-rn population. However, survival following treatment with the herbicides glyphosate and chlorimuron-ethyl occurred. The evolution of H2O2 began at 15 min after application and was less pronounced in low light. These results indicate the first case of resistance to 2,4-D and occurrence of rapid necrosis in C. sumatrensis.
- Subjects :
- 0106 biological sciences
education.field_of_study
biology
Saflufenacil
Population
Triclopyr
Picloram
04 agricultural and veterinary sciences
Plant Science
biology.organism_classification
01 natural sciences
Conyza sumatrensis
010602 entomology
Horticulture
chemistry.chemical_compound
chemistry
Glyphosate
Dicamba
040103 agronomy & agriculture
0401 agriculture, forestry, and fisheries
education
Agronomy and Crop Science
Fluroxypyr
Subjects
Details
- ISSN :
- 15502759 and 00431745
- Database :
- OpenAIRE
- Journal :
- Weed Science
- Accession number :
- edsair.doi...........797ba6b23b6a7b033eb5fda3a9259ba6