Metabolism, uptake and translocation of 14C-paraquat in resistant and susceptible biotypes of Crassocephalum crepidioides (Benth.) S. Moore

Ismail Sahid, T. S. Chuah, H. Hussin Khatijah

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The metabolism, uptake and translocation of paraquat in resistant (R) and susceptible (S) biotypes of Crassocephalum crepidioides (Benth.) S. Moore (redflower ragleaf) at the 10-leaf stage was investigated. A study on the properties of leaf surface was carried out to examine the relationship between leaf surface characters and paraquat absorption. The extractable paraquat was not metabolized by the leaf tissue of either the resistant or susceptible biotypes. Differential metabolism, therefore, does not appear to play a role in the mechanism of resistance. Both biotypes did not show any significant difference in the amount of cuticle and trichome densities. Furthermore, both biotypes are identical in the structure of stomata, trichomes and epicuticular wax. The results of the leaf surface studies are in agreement with the findings of the uptake study. Both biotypes demonstrated no significant difference in absorption between the resistant and susceptible biotypes. However, 10% of the absorbed 14C-paraquat into the S biotype was translocated basipetally, but not in the R biotype. The results of this study suggest that in C. crepidioides, differential translocation may contribute to the mechanism of resistance at the 10-leaf stage.

Original languageEnglish
Pages (from-to)176-181
Number of pages6
JournalWeed Biology and Management
Volume1
Issue number3
Publication statusPublished - 2001

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paraquat
biotype
biotypes
translocation
metabolism
uptake mechanisms
leaves
trichome
resistance mechanisms
trichomes
Crassocephalum
epicuticular wax
stomata
cuticle
wax

Keywords

  • Crassocephalum crepidioides
  • Metabolism
  • Paraquat
  • Translocation
  • Uptake

ASJC Scopus subject areas

  • Ecology
  • Plant Science
  • Agronomy and Crop Science

Cite this

Metabolism, uptake and translocation of 14C-paraquat in resistant and susceptible biotypes of Crassocephalum crepidioides (Benth.) S. Moore. / Sahid, Ismail; Chuah, T. S.; Hussin Khatijah, H.

In: Weed Biology and Management, Vol. 1, No. 3, 2001, p. 176-181.

Research output: Contribution to journalArticle

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