Mechanism of paraquat resistance in crassocephalum crepidioides (Benth.) S. moore during immature stage

• Main Authors: B. S., Ismail, T. S., Chuah, H. H., Khatijah
• Format: Article
• Language: English
• Published: Universiti Putra Malaysia Press 2004
• Online Access: http://psasir.upm.edu.my/id/eprint/3551/1/Mechanism_of_Paraquat_Resistance_in_Crassocephalum_crepidioides.pdf; http://psasir.upm.edu.my/id/eprint/3551/; http://www.pertanika.upm.edu.my/Pertanika%20PAPERS/JTAS%20Vol.%2027%20(1)%20Apr.%202004/01%20JTAS%20Vol.27%20(1)%202004%20(Pg%201-10).pdf
• Institution: Universiti Putra Malaysia

The mechanism of paraquat resistance in Crassocephalum crepidioides at the six-leaf stage was investigated. The extractable paraquat was not metabolized fly the leaf tissue in the resistant (R) and susceptible (S) biotypes. Therefore, differential metabolism does not appear to play a role in the mechanism of resistance. The S biotype absorbed 44% more 14Gparaquat than the R biotype. However, more than 98% of the absorbed 14G paraquat remained on the treated leaf of both biotypes. The difference in absorption had a negative correlation with the amount of epicuticular wax as well as the cuticle of leaf surfaces in both biotypes. The results of this study suggest that differential absorption may be a factor that accounts for resistance to paraquat at the six-leaf stage.