Search

Copyright of Guihaia is the property of Guihaia Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Sprangletop (Leptochloa chinensis (L.) Nees) is one of the most serious grass weeds which can cause damage to rice field in China. To determine the resistance level of L. chinensis to aryloxyphenoxypropionates herbicides in rice fields in Zhejiang Province, a total of 11 L. chinensis populations (including one susceptible population) were collected in this study. Results of whole-plant dose- response assay tests showed that 8 populations had developed resistance to cyhalofop-butyl (resistance index: 2.1-79.1) and 9 populations had developed resistance to metamifop (resistance index: 2.0-31.0). Partial sequences of the ACCase gene in the susceptible and resistant populations were analyzed by PCR and gene clone. The Ile-1781-Val mutation was found in one resistant population and the Trp- 2027-Cys mutation was found in two resistant populations. In conclusion, this study revealed that L. chinensis in rice fields in Zhejiang Province had developed different resistance levels to cyhalofop-butyl and metamifop, the Ile-1781-Val and Trp-2027-Cys mutations in the ACCase gene might contribute to the resistance in several populations. [ABSTRACT FROM AUTHOR]