Gaines, T.A., Zhang, W., Wang, D., Bukun, B., Chisholm, S.T., Shaner, D.L., Nissen, S.J., Patzoldt, W.L., Tranel, P.J., Culpepper, A.S., Grey, T.L., Webster, T.M., Vencill, W.K., Sammons, R.D., Jiang, J., Preston, C., Leach, J.E. and Westra, P. (2010) Gene Amplification Confers Glyphosate Resistance in Amaranthus palmeri. Proceedings of the National Academy of Science, 107, 1029-1034.
https://doi.org/10.1073/pnas.0906649107

has been cited by the following article:

• TITLE: Effects of Myrothecium verrucaria on Two Glyphosate-Resistant Amaranthus palmeri Biotypes Differing in Betacyanin Content

  AUTHORS: Robert E. Hoagland, Clyde Douglas Boyette, Robin H. Jordan, Kenneth C. Stetina

  KEYWORDS: Betalain, Bioherbicide, Biological Weed Control, Palmer Amaranth, Pigweed

  JOURNAL NAME: American Journal of Plant Sciences, Vol.11 No.2, February 21, 2020

  ABSTRACT: Previously we found two biotypes of Amaranthus palmeri (Palmer amaranth) in a population of this economically important weed that were resistant to glyphosate but differed with respect to pigmentation. One biotype was typically red-pigmented (betacyanin) while the other was green, with no visual appearance of red hue on any plant part at any growth stage. We have also reported that a strain of Myrothecium verrucaria (MV) exhibited bioherbicidal activity against several important weeds including glyphosate-resistant Palmer amaranth. In greenhouse tests, MV was applied to these two biotypes (red and green) at two ages (3-week- and 6-week-old) and effects of this fungus monitored over a 5-day time course. Initial symptoms of MV (16 to 24 h after inoculation) were: epinastic curvature, wilting and development of lesions on leaves and stems. Generally, the younger plants tended to be more sensitive to MV than older plants. Bioherbicidal damage increased with time leading to necrosis and plant mortality and increasing disease progress. Severe loss of fresh weight occurred in both biotypes as compared to untreated plants. Results indicated that MV was effective on both biotypes, but effects on growth reduction and disease progression were more rapid and generally greater in the green biotype, suggesting that compounds responsible for red pigmentation may be more potent as defense against pathogen attack.