| Abstrakt: |
ABSTRACTEpichloëis a genus of filamentous fungal endophytes that have co-evolved with cool-season grasses with which they form long-term, symbiotic associations. In natural ecosystems Epichloëhave implications for species diversity, food web structures and fundamental ecological processes. Epichloëproduce a range of secondary metabolites that can have negative effects on herbivores, be they invertebrates or vertebrates. In many managed pastoral systems, selected asexual Epichloëstrains are purposefully associated with grass cultivars (termed novel endophyte-grass associations) as they confer beneficial traits that protect the host from abiotic stresses (e.g. drought) and biotic stresses (e.g. herbivory from invertebrates) while having minimal impact on the health and welfare of ruminant livestock. As well as conferring beneficial traits, agriculturally selected strains of Epichloëcan also increase plant biomass and seed yield. Epichloëendophyte-technology has and continues to be a scientific, agricultural, and marketing success with selected asexual strains of Epichloënow essential components of many pasture ecosystems, within New Zealand and abroad. An estimated 90% of proprietary ryegrass now sold in New Zealand contains a selected endophyte strain while the economic impact in New Zealand of AR37 alone has been estimated at NZ$3.6 billion over 20 years. With a changing climate, agriculture will continue to experience increasing temperatures, elevated atmospheric CO2levels and changing precipitation patterns that will likely increase the geographic range and overwintering survival rates of pests. Furthermore, plant disease outbreaks are expected to intensify due to increases in the severity of existing phytopathogens and/or invasions by new phytopathogens. Functional symbioses, such as those between temperate grasses and Epichloë, are among the most successful mechanisms by which plants can improve their ability to tolerate stress. Future research is likely to utilise targeted genetic manipulation techniques to broaden the biocontrol ability of Epichloëstrains, particularly to mitigate climate related stresses. |
