Journal or Publishing Institution: Journal of Agricultural and Food Chemistry
Study: https://pubs.acs.org/doi/abs/10.1021/jf5055722
Author(s): Ribeiro, D.N., Nandula, V.K., Dayan, F.E., Rimando, A.M., Duke, S.O., Reddy, K.N. and Shaw, D.R.
Article Type: Peer Reviewed Study
Record ID: 2068
Abstract: Natural tolerance of Ipomoea lacunosa to glyphosate has made it problematic in the southeastern U.S. since the adoption of glyphosate-resistant crops. Experiments were conducted to determine (i) the variability in tolerance to glyphosate among accessions, (ii) if there is any correlation between metabolism of glyphosate to aminomethylphosponic acid (AMPA) or sarcosine and the level of tolerance, and (iii) the involvement of differential translocation in tolerance to glyphosate. Fourteen I. lacunosa accessions had GR50 values ranging from 58 to 151 grams of acid equivalent per hectare (ae/ha) glyphosate, a 2.6-fold variability in tolerance to glyphosate. There was no evidence of the most tolerant (MT) accession metabolizing glyphosate to AMPA more rapidly than the least tolerant (LT) accession. Metabolism to sarcosine was not found. 14C-glyphosate absorption was similar in the two accessions. LT accession translocated more 14C-glyphosate than MT accession at 24 and 48 h after treatment. Differential translocation partly explains glyphosate tolerance in MT accession.
Keywords: 5-enolpyruvylshikimate-3-phosphate synthase (EPSPS); absorption; glyphosate; herbicide resistance; Ipomoea lacunosa; metabolism; pitted morningglory; translocation, crops, Southeastern United States
Citation: Ribeiro, D.N., Nandula, V.K., Dayan, F.E., Rimando, A.M., Duke, S.O., Reddy, K.N. and Shaw, D.R., 2015. Possible glyphosate tolerance mechanism in pitted morningglory (Ipomoea lacunosa L.). Journal of Agricultural and Food Chemistry, 63(6), pp.1689-1697.
