02513naa a2200349 a 450000100080000000500110000800800410001910000200006024501040008026000090018450001260019352012960031965000430161565000250165865000100168365000190169365000170171265000270172965300240175665300300178065300270181065300320183765300280186965300290189765300340192665300300196070000210199070000150201170000230202670000190204977300950206820889752021-08-17       2017    bl uuuu     u00u1 u    #d1 aAGOSTINETTO, D.  aMorphophysiogenetic characterization of wild poinsettia biotypes with low resistance to glyphosate.  c2017  aTítulo em português: Caracterização morfofisiogenética de biótipos de leiteira com baixa resistência ao glifosato.  aThe objective of this work was to compare wild poinsettia (Euphorbia heterophylla) biotypes as to their morphological characteristics, as well as to determine their genetic similarity in the state of Rio Grande do Sul, Brazil, and to confront the light compensation point of susceptible biotypes and of biotypes with low-resistance level to glyphosate. Besides the morphology analysis, the study included the genetic characterization, by AFLP, of susceptible (GR50 = 58.65 g ha-1 a.e.) biotypes and of biotypes with low resistance (GR50 = 310.36 g ha-1 a.e.) to glyphosate. The competitive ability of the biotypes was inferred according to their light compensation point. The observed morphological characteristics do not allow to differentiate biotypes as to their geographical location, or their resistance level to glyphosate. The genetic analysis identified low genetic diversity among the 15 tested biotypes, with a large amount of subgroups. The biotypes with low resistance formed an isolated group. The susceptible biotypes showed the lowest values of light compensation point and, possibly, they have a greater competitive ability under low-luminosity conditions. The evaluated characteristics do not enable to differentiate genotypes with different levels of glyphosate resistance.  aAmplified fragment length polymorphism  aHerbicide resistance  aWeeds  aAmendoim bravo  aErva daninha  aEuphorbia Heterophylla  aCompetitive ability  aEPSPs inhibitor herbicide  aHabilidade competitiva  aHerbicida inibidor de EPSPs  aIght compensation point  aLight compensation point  aPonto de compensação de luz  aResistência a herbicidas1 aULGUIM, A. da R.1 aVARGAS, L.1 aSILVA, J. D. G. da1 aLANGARO, A. C.  tPesquisa Agropecuária Brasileira, Brasília, DFgv. 52, n, 11, p. 987-996, novembro 2017.