Russian Journal of Developmental Biology

, Volume 46, Issue 5, pp 263–275 | Cite as

Development of arbuscular mycorrhiza in highly responsive and mycotrophic host plant–black medick (Medicago lupulina L.)

  • A. P. Yurkov
  • L. M. Jacobi
  • N. E. Gapeeva
  • G. V. Stepanova
  • M. F. Shishova
Developmental Biology of Plants


The main phases of arbuscular mycorrhiza (AM) development were analyzed in black medick (Medicago lupulina) with Glomus intraradices. Methods of light and transmission electron microscopy were used to investigate AM. The first mycorrhization was identified on the seventh day after sowing. M. lupulina with AM-fungus Glomus intraradices formed Arum type of AM. Roots of black medick at fruiting stage (on the 88th day) were characterized by the development of forceful mycelium. The thickness of mycelium was comparable with the vascular system of root central cylinder. The development of vesicules into intraradical spores was shown. Micelium, arbuscules, and vesicules developed in close vicinity to the division zone of root tip. This might be evidence of an active symbiotic interaction between partners. All stages of fungal development and breeding, including intraradical spores (in intercellular matrix of root cortex), were identified in the roots of black medick, which indicated an active utilization of host plant nutrient substrates by the mycosymbiont. Plant cell cytoplasm extension was identified around young arbuscular branches but not for intracellular hyphae. The presence of active symbiosis was confirmed by increased accumulation of phosphorus in M. lupulina root tissues under conditions of G. intraradices inoculation and low phosphorus level in the soil. Thus, black medick cultivar-population can be characterized as an ecologically obligate mycotrophic plant under conditions of low level of available phosphorus in the soil. Specific features of AM development in intensively mycotrophic black medick, starting from the stage of the first true leaf until host plant fruiting, were evaluated. The obtained plant-microbe system is a perspective model object for further ultracytological and molecular genetic studies of the mechanisms controlling arbuscular mycorrhiza symbiotic efficiency, including selection and investigation of new symbiotic plant mutants.


arbuscular mycorrhiza Medicago lupulina black medick Glomus intraradices arbuscular mycorrhizal fungus symbiotic structures arbuscules vesicles spores light mycroscopy electron microscopy 


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Copyright information

© Pleiades Publishing, Inc. 2015

Authors and Affiliations

  • A. P. Yurkov
    • 1
    • 2
    • 3
  • L. M. Jacobi
    • 1
  • N. E. Gapeeva
    • 1
  • G. V. Stepanova
    • 4
  • M. F. Shishova
    • 5
  1. 1.Laboratory of Ecology of Symbiotic and Associative MicroorganismsAll-Russia Research Institute for Agricultural MicrobiologySt. PetersburgRussia
  2. 2.International Research Centre “Biotechnologies of the Third Millennium,”ITMO UniversitySt. PetersburgRussia
  3. 3.Chair of Ecology, Faculty of Ecology and Physics of NatureRussian State Hydrometeorological UniversitySt. PetersburgRussia
  4. 4.Laboratory of Breeding Symbiotic TechnologiesAll-Russia Williams Fodder Research InstituteMoscowRussia
  5. 5.Chair of Plant Physiology and Biochemistry, Biological FacultySt. Petersburg State UniversitySt. PetersburgRussia

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