title: Nucleotide variability in the 5-enolpyruvylshikimate-3-phosphate synthase gene from Eleusine indica (L.) Gaertn.
abstract: This study reports the results of the partial DNA sequence analysis of the 5-enolpyruvyl-shikimate-3-phosphate synthase (EPSPS) gene in glyphosate-resistant (R) and glyphosate-susceptible (S) biotypes of Eleusine indica (L.) Gaertn from Peninsular Malaysia. Sequencing results revealed point mutation at nucleotide position 875 in the R biotypes of Bidor, Chaah and Temerloh. In the Chaah R population, substitution of cytosine (C) to adenine (A) resulted in the change of threonine (Thr106) to proline (Pro106) and from C to thymidine (T) in the Bidor R population, leading to serine (Ser106) from Pro106. As for the Temerloh R, C was substituted by T resulting in the change of Pro106 to Ser106. A new mutation previously undetected in the Temerloh R was revealed with C being substituted with A, resulting in the change of Pro106 to Thr106 indicating multiple founding events rather than to the spread of a single resistant allele. There was no point mutation recorded at nucleotide position 875 previously demonstrated to play a pivotal role in conferring glyphosate resistance to E. indica for the Lenggeng, Kuala Selangor, Melaka R populations. Thus, there may be another resistance mechanism yet undiscovered in the resistant Lenggeng, Kuala Selangor and Melaka populations.
authors.affiliation: Department of Biological Sciences, Faculty of Science and Technology, Universiti Malaysia Terengganu, Mengabang Telipot, 21030 Kuala Terengganu, Terengganu, Malaysia.
authors.forename: J L
authors.initials: JL
authors.lastname: Chong
authors.forename: R
authors.initials: R
authors.lastname: Wickneswari
authors.forename: B S
authors.initials: BS
authors.lastname: Ismail
authors.forename: S
authors.initials: S
authors.lastname: Salmijah
mesh_terms: D051229:3-Phosphoshikimate 1-Carboxyvinyltransferase / Q000235:genetics*; D001483:Base Sequence; D017931:DNA Primers; D031748:Eleusine / Q000201:enzymology*
chemical_list: D017931:DNA Primers; D051229:3-Phosphoshikimate 1-Carboxyvinyltransferase