Sample storage conditions alter colonisation structures of arbuscular mycorrhizal fungi and, particularly, fine root endophyte
- 905 Downloads
Background and Aims
The structures of arbuscular mycorrhizal (AM) fungi (hyphae, arbuscules, vesicles, spores) are used to make inferences about fungal activity based on stored samples, yet the impact of storage method has not been quantified, despite known effects of temperature and host condition on AM fungal colonisation.
We measured how four storage treatments (cool or ambient conditions, with and without plant shoots attached, i.e. n = four treatment combinations) affected AM fungal colonisation of subterranean clover (Trifolium subterraneum L.) after 0, 2, 6 and 10 days of storage. Roots were assessed for colonisation of fine root endophyte and coarse AM fungi.
For coarse AM fungi, total colonisation was unaffected, but arbuscules were reduced at Day 6 and increased again by Day 10, except Ambient-Minus-Shoots. There was a loss of vesicles in all treatments at Day 2, and an increase in spore number at Day 6 within Cool-Plus-Shoots. In contrast, for fine root endophyte, total colonisation was greatly reduced at Day 6 but increased again at Day 10, in all except the Cool-Plus-Shoots treatment.
Our data demonstrate that AM fungal activity is not suspended in commonly used plant storage conditions. Storage method and time impacted AM fungal colonisation, particularly for fine root endophyte. We recommend samples are processed within 2 days of harvest.
KeywordsArbuscules Fine endophyte Glomus tenue Mycorrhizal structures Plant sample storage Spores Vesicles
This research formed part of a project supported by an Australian Government Postgraduate Award, a Meat and Livestock Australia Postgraduate Scholarship and a Henry Schapper Postgraduate Research Scholarship, and we gratefully acknowledge this funding. We wish to thank two anonymous reviewers for their constructive comments on this manuscript.
- Brundrett M, Bougher N, Dell B, Grove T, Malajczuk N (1996) Working with mycorrhizas in forestry and agriculture. Australian Centre for International Agricultural Research, CanberraGoogle Scholar
- McArthur WM, Bettenay E (1959) The soils and irrigation potential of the Pinjarra-Waroona area, Western Australia. CSIRO, Division of Soils, MelbourneGoogle Scholar
- Schussler A and Walker C (2010) The glomeromycota. A species list with new families and new genera. www.amf-phylogeny.com. Accessed 25 March 2015Google Scholar
- Smith S, Gianinazzi-Pearson V (1990) Phosphate uptake and arbuscular activity in mycorrhizal Allium cepa L.: effects of photon irradiance and phosphate nutrition. Funct Plant Biol 17:177–188Google Scholar
- Smith SE, Read DJ (2008) Mycorrhizal symbiosis. Elsevier, BurlingtonGoogle Scholar