| Autor: |
G, Mitchell, D W, Bartlett, T E, Fraser, T R, Hawkes, D C, Holt, J K, Townson, R A, Wichert |
| Rok vydání: |
2001 |
| Předmět: |
|
| Zdroj: |
Pest management science. 57(2) |
| ISSN: |
1526-498X |
| Popis: |
Mesotrione is a new herbicide being developed for the selective pre- and post-emergence control of a wide range of broad-leaved and grass weeds in maize (Zea mays). It is a member of the benzoylcyclohexane-1,3-dione family of herbicides, which are chemically derived from a natural phytotoxin obtained from the Californian bottlebrush plant, Callistemon citrinus. The compound acts by competitive inhibition of the enzyme 4-hydroxyphenylpyruvate dioxygenase (HPPD), a component of the biochemical pathway that converts tyrosine to plastoquinone and alpha-tocopherol. Mesotrione is an extremely potent inhibitor of HPPD from Arabidopsis thaliana, with a Ki value of c 6-18 pM. It is rapidly taken up by weed species following foliar application, and is distributed within the plants by both acropetal and basipetal movement. Maize is tolerant to mesotrione as a consequence of selective metabolism by the crop plant. Slower uptake of mesotrione, relative to susceptible weed species, may also contribute to its utility as a selective herbicide for use in maize. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
Plný text