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Title

RESTRICTED HERBICIDE TRANSLOCATION WAS FOUND IN TWO GLYPHOSATE-RESISTANT ITALIAN RYEGRASS (LOLIUM MULTIFLORUM LAM.) POPULATIONS FROM NEW ZEALAND

Pages

 Start Page 1041 | End Page 1051

Abstract

 Glyphosate resistance has been found in two populations of Italian ryegrass (Lolium multiflorum) following many years of GLYPHOSATE application in New Zealand vineyards.Dose-response experiments showed that both GLYPHOSATE-resistant Italian ryegrass populations had 10-fold levels of resistance to GLYPHOSATE compared to a susceptible population. Possible mechanisms of GLYPHOSATE resistance target site mutation at position Pro-106 of 5-enolpyruvyl-shikimate-3-phosphate synthase gene and alterations in GLYPHOSATE absorption/translocation in these populations were investigated. Genotyping assays demonstrated that there was no point mutation at Codon 106 of the5-enolpyruvylshikimate-3-phosphate synthasegene in either of the resistant populations. GLYPHOSATEresistant and susceptible populations did not differ in14C-glyphosate absorption.However, in both resistant populations, much more of the absorbed14C-glyphosate was retained in the treated leaf than occurred in the susceptible population. Significantly more 14C-glyphosate was found in the pseudostem region of susceptible plants than resistant plants. Based on these results, it was suggested that alterations in GLYPHOSATE translocation patterns plays a major role in GLYPHOSATE resistance for Italian ryegrass populations from these New Zealand vineyards.

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