Diversisporales

Gigaspora margarita: Clearly visible are the round brown spores

The Diversisporales are an order of fungi that form a symbiosis ( mycorrhiza ) with lots of plants.

Features

The fungi form in soil and plant roots usually unseptierte hyphae. They form arbuscular mycorrhizae with or without the formation of vesicles and with or without the formation of hypogean auxiliary cells. Asexual reproduction occurs by spores. These can either be constructed complex with a spore-bearing sacculus, then they are called acaulosporoide spores, or are recognized as complex spores that develop from a bulbous base on the spore-bearing hypha ( gigasporoide spores), or they form round glomoide spores. From other orders of the Glomeromycota they differ genetically: You have the SSU rRNA gene sequences GGGTTTH and TYACCGGRAGGTRT that correspond to the homologous position 254 and 1495 of the Saccharomyces cerevisiae SSU rRNA sequence J01353.

Ecology and life

The Diversisporales are almost always hypogeous, ie growing in the soil, rarely epigeal, ie on the soil surface. They always form a mycorrhizal symbiosis with a variety of plant species. They supply of plant nutrients (especially phosphorus ) and water and get themselves a part of the assimilates produced by photosynthesis and are found in almost all terrestrial ecosystems. Characteristically, they form like most arbuscular mycorrhizas in the roots called vesicles and arbuscules.

System

Since the Diversisporales like most arbuscular mycorrhizal fungi have few morphological features for differentiation, many species Glomus were counted in addition to the genera Gigaspora and Acaulospora to the genus. Using molecular biology techniques, it was found that the genus is polyphyletic. Walker and Schuessler already described the order while in 2001, she published, but is valid until 2004 At the moment the order includes eight genera in five families.:

  • Gigasporaceae Gigaspora
  • Scutellospora
  • Racocetra
  • Acaulospora: including the former genus Kuklospora
  • Entrophospora: unclear systematic position
  • Pacispora
  • Diversispora: former Glomus -C group, contains several species that formerly belonged to Glomus.
  • Otospora: unclear systematic position

Swell

  • Christopher Walker, Arthur Schuessler: nomenclatural Clarifications and new taxa in the Glomeromycota. In: Mycol. Res 108, 2004, pp. 981-982. doi: 10.1017/S0953756204231173
  • LMU Munich: AMF species list, accessed on July 7, 2013
  • LMU Munich: AMF taxonomy, accessed on July 7, 2013
Opisthokont Glomus (fungus) Digital Object Identifier
242032
de