Genome diversity in wild grasses under environmental stress

Timothy L. Fitzgerald, Frances M. Shapter, Stuart McDonald, Daniel L E Waters, Ian H. Chivers, Andre Drenth, Eviatar Nevo, Robert J. Henry

    Research output: Contribution to journalArticlepeer-review

    42 Citations (Scopus)


    Patterns of diversity distribution in the Isa defense locus in wildbarley populations suggest adaptive selection at this locus. The extent to which environmental selection may act at additional nuclear-encoded defense loci and within the whole chloroplast genome has now been examined by analyses in two grass species. Analysis of genetic diversity in wild barley (Hordeum spontaneum) defense genes revealed much greater variation in biotic stress-related genes than abiotic stress-related genes. Genetic diversity at the Isa defense locus in wild populations of weeping ricegrass [Microlaena stipoides (Labill.) R. Br.], a very distant wild-rice relative, was more diverse in samples from relatively hotter and drier environments, a phenomenon that reflects observations in wild barley populations. Whole-chloroplast genome sequences of bulked weeping ricegrass individuals sourced from contrasting environments showed higher levels of diversity in the drier environment in both coding and noncoding portions of the genome. Increased genetic diversity may be important in allowing plant populations to adapt to greater environmental variation in warmer and drier climatic conditions.

    Original languageEnglish
    Pages (from-to)21140-21145
    Number of pages6
    JournalProceedings of the National Academy of Sciences of the United States of America
    Issue number52
    Publication statusPublished - 27 Dec 2011


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