Volume 18, Issue 4 (2016)                   JAST 2016, 18(4): 1041-1051 | Back to browse issues page

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Ghanizadeh H, Harrington K, James T, Woolley D, Ellison N. Restricted Herbicide Translocation Was Found in Two Glyphosate-resistant Italian Ryegrass (Lolium multiflorum Lam.) Populations from New Zealand. JAST. 18 (4) :1041-1051
URL: http://journals.modares.ac.ir/article-23-3456-en.html
1- Institute of Agriculture and Environment, Massey University, PB 11-222, Palmerston North 4442, New Zealand.
2- AgResearch Ltd., Ruakura Research Centre, PB 3123, Hamilton 3240, New Zealand.
3- AgResearch Grasslands, PB 11008, Palmerston North 4442, New Zealand.
Abstract:   (2981 Views)
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 the 5-enolpyruvyl-shikimate-3-phosphate synthase gene in either of the resistant populations. Glyphosate-resistant and susceptible populations did not differ in 14C-glyphosate absorption. However, in both resistant populations, much more of the absorbed 14C-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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Article Type: Research Paper | Subject: Weed Science
Received: 2015/04/18 | Accepted: 2015/10/11 | Published: 2016/07/1

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