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Mycotrophy of Annona cherimola and the morphology of its mycorrhizae

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The mycotrophic character of Annona cherimola (Magnoliales), a tropical/subtropical plantation crop of interest, is described for the first time. This crop seems to depend on mycorrhizae (arbuscular) for optimal growth, with Glomus deserticola being the most effective endophyte tested. Study of the morphology of the arbuscular mycorrhizae in Annona roots showed exclusively intracellular hyphal development, with cell-to-cell fungal passage and an abundance of arbuscules and coiled hyphae within cells. Intercellular distributive hyphae were not observed. The morphology and the pattern of spread of the mycorrhizal colonization were similar for the different endophytes involved and appeared to be dependent on the host root. Such features of mycorrhizal colonization are characteristic of host species lacking intercellular air channels and have been described for some species of ecological interest, but they are not commonly noted in the mycorrhizal literature, especially that dealing with crop species. Some ecophysiological consequences of this pattern of colonization are discussed.

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Azcón-Aguilar, C., Encina, C.L., Azcón, R. et al. Mycotrophy of Annona cherimola and the morphology of its mycorrhizae. Mycorrhiza 4, 161–168 (1994). https://doi.org/10.1007/BF00203534

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Key words

  • Annona cherimola
  • Mycotrophy
  • Arbuscular mycorrhizae
  • Glomus species
  • Morphology