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Fungal lipid accumulation and development of mycelial structures by two arbuscular mycorrhizal fungi

In English

Författare

Summary, in English

We monitored the development of intraradical and extraradical mycelia of the arbuscular mycorrhizal (AM) fungi Scutellospora calospora and Glomus intraradices when colonizing Plantago lanceolata. The occurrence of arbuscules (branched hyphal structures) and vesicles (lipid storage organs) was compared with the amounts of signature fatty acids. The fatty acid 16:1omega5 was used as a signature for both AM fungal phospholipids (membrane constituents) and neutral lipids (energy storage) in roots (intraradical mycelium) and in soil (extraradical mycelium). The formation of arbuscules and the accumulation of AM fungal phospholipids in intraradical mycelium followed each other closely in both fungal species. In contrast, the neutral lipids of G. intraradices increased continuously in the intraradical mycelium, while vesicle occurrence decreased after initial rapid root colonization by the fungus. S. calospora does not form vesicles and accumulated more neutral lipids in extraradical than in intraradical mycelium, while the opposite pattern was found for G. intraradices. G. intraradices allocated more of its lipids to storage than did S. calospora. Thus, within a species, the fatty acid 16:1omega5 is a good indicator for AM fungal development. The phospholipid fatty acid 16:1omega5 is especially suitable for indicating the frequency of arbuscules in the symbiosis. We propose that the ratio of neutral lipids to phospholipids is more important than is the presence of vesicles in determining the storage status of AM fungi.

Publiceringsår

2003

Språk

Engelska

Sidor

6762-6767

Publikation/Tidskrift/Serie

Applied and Environmental Microbiology

Volym

69

Issue

11

Dokumenttyp

Artikel i tidskrift

Förlag

American Society for Microbiology

Ämne

  • Ecology

Status

Published

Forskningsgrupp

  • Microbial Ecology
  • Plant Biology

ISBN/ISSN/Övrigt

  • ISSN: 0099-2240