(Galium Aparine L.) and False Cleavers

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Molecular discrimination of Catchweed Bedstraw (Galium aparine L.) and False Cleavers (Galium spurium L.) in Western Canada Andrea De Roo, Peter Eckstein, Aaron Beattie and Chris Willenborg University of Saskatchewan, Saskatoon Galium spp. ▪ Three in Western Canada • Galium boreale L. • Galium aparine L. • Galium spurium L. ▪ Differences in habitat preferences ▪ Known differences in chromosome count in Galium aparine and Galium spurium Galium aparine vs. Galium spurium Importance to Weed Science ▪ Need for improved techniques ▪ Predict the movement of herbicide resistance ▪ Competitive characteristics ▪ Environmental restraints The Problem for Producers ▪ Presence of cleavers on the Prairies is increasing ▪ Difficult to determine species visually and cytogentically ▪ Solution: Look into DNA to tell them apart Project Objectives ▪ Identify variation within the ITS1-5.8S-ITS2 region in the cleavers genome that could be used to differentiate species ▪ Determine the speciation of various cleavers populations across western Canada What is the ITS Region? 18S 5.8S 26S ITS1 ITS2 Large Subunit RNA ITS1 → 18S 5.8S 26S ITS1 ITS2 ITS4 ▪ 5.8S gene is highly conserved ▪ ITS1 and ITS2 can readily evolve Methodology ▪ Cleaver DNA extracted from leaf material • Standard CTAB method ▪ ITS1-5.8S-ITS2 region isolated using polymerase chain reaction (PCR) ▪ Clone to isolate single copies ▪ Sequencing • Standard Sanger sequencing Developing Consensus Sequences ▪ 10 plant samples per population • Isolated and sequenced 3 copies of the target region • Total of 30 sequences for a consensus sequence ▪ Why? a) PCR coping introduces mistakes b) Sequencing introduces mistakes ▪ Robust sequences Variation at the ITS2 Variation in the 5.8S Gene Spurium – A Aparine – G Conclusions ▪ ITS region can successfully differentiate Galium spp. ▪ Cleavers populations are Galium spurium ▪ Herbicide resistance could develop • Already resistant to group 2 and 4 ▪ Formation of markers to check speciation in more samples, quickly and economically Acknowledgements ▪ Supervisor: ▪ CMG Lab Dr. Christian Willenborg Peter Eckstein ▪ Committee Members: Mark Colin Dr. Aaron Beattie ▪ Fellow Grad Students Dr. Steve Shirtliffe Dr. Yuguang Bai Questions? .

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