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Plant and Soil

, Volume 194, Issue 1–2, pp 185–192 | Cite as

The impact of molecular systematics on hypotheses for the evolution of root nodule symbioses and implications for expanding symbioses to new host plant genera

  • Susan M. Swensen
  • Beth C. Mullin
Article

Abstract

Current taxonomic schemes place plants that can participate in root nodule symbioses among disparate groups of angiosperms. According to the classification scheme of Cronquist (1981) which is based primarily on the analysis of morphological characters, host plants of rhizobial symbionts are placed in subclasses Rosidae and Hamamelidae, and those of Frankia are distributed among subclasses Rosidae, Hamamelidae, Magnoliidae and Dilleniidae. This broad phylogenetic distribution of nodulated plants has engendered the notion that nitrogen fixing endosymbionts, particularly those of actinorhizal plants, can interact with a very broad range of unrelated host plant genotypes. New angiosperm phylogenies based on DNA sequence comparisons reveal a markedly different relationship among nodulated plants and indicate that they form a more coherent group than has previously been thought (Chase et al., 1993; Swensen et al., 1994; Soltis et al., 1995). Molecular data support a single origin of the predisposition for root nodule symbiosis (Soltis et al., 1995) and at the same time support the occurrence of multiple origins of symbiosis within this group (Doyle, 1994; Swensen, 1996; Swensen and Mullin, In Press).

actinorhizal plants evolution nitrogen fixation phylogenetic hypotheses 

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Copyright information

© Kluwer Academic Publishers 1997

Authors and Affiliations

  • Susan M. Swensen
    • 1
  • Beth C. Mullin
    • 2
  1. 1.Department of BiologyIthaca CollegeIthacaUSA
  2. 2.The Department of Botany and the Center for Legume ResearchThe University of TennesseeKnoxvilleUSA

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