Mechanism of Paraquat Resistance in Crassocephalum crepidioides (Benth.) S. Moore During Immature Stage
B. S., Ismail, T. S., Chuah and H. H., Khatijah (2004) Mechanism of Paraquat Resistance in Crassocephalum crepidioides (Benth.) S. Moore During Immature Stage. Pertanika Journal of Tropical Agricultural Science, 27 (1). pp. 1-10. ISSN 1511-3701
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.
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