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Genetic compatibility determines endophyte-grass combinations

Saikkonen, Kari; Wäli, Piippa R. and Helander, Marjo (2010) Genetic compatibility determines endophyte-grass combinations. PLOSone, 5 (6).

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Online at: http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0011395

Summary

Even highly mutually beneficial microbial-plant interactions, such as mycorrhizal- and rhizobial-plant exchanges, involve selfishness, cheating and power-struggles between the partners, which depending on prevailing selective pressures, lead to a continuum of interactions from antagonistic to mutualistic. Using manipulated grass-endophyte combinations in a five year common garden experiment, we show that grass genotypes and genetic mismatches constrain genetic combinations between the vertically (via host seeds) transmitted endophytes and the out-crossing host, thereby reducing infections in established grass populations. Infections were lost in both grass tillers and seedlings in F1 and F2 generations, respectively. Experimental plants were collected as seeds from two different environments, i.e., meadows and nearby riverbanks. Endophyte-related benefits to the host included an increased number of inflorescences, but only in meadow plants and not until the last growing season of the experiment. Our results illustrate the importance of genetic host specificity and trans-generational maternal effects on the genetic structure of a host population, which act as destabilizing forces in endophyte-grass symbioses. We propose that (1) genetic mismatches may act as a buffering mechanism against highly competitive endophyte-grass genotype combinations threatening the biodiversity of grassland communities and (2) these mismatches should be acknowledged, particularly in breeding programmes aimed at harnessing systemic and heritable endophytes to improve the agriculturally valuable characteristics of cultivars.


EPrint Type:Journal paper
Keywords:endophytes, grasses, combinations, genetic compatibility
Subjects: Crop husbandry
Research affiliation: Finland
Deposited By: Koistinen, Riitta
ID Code:17834
Deposited On:07 Oct 2010 07:39
Last Modified:07 Oct 2010 07:39
Document Language:English
Status:Published
Refereed:Peer-reviewed and accepted

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