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    • Irish Journal of Agricultural & Food Research
    • IJAFR, volume 54, no 1, 2015
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    • Irish Journal of Agricultural & Food Research
    • IJAFR, volume 54, no 1, 2015
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    Microarray analysis of spring barley cultivars displaying differing sensitivity to physiological leaf spot (PLS)

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    Author
    Moran, Mary G.
    Dix, Philip J.
    Burke, James I.
    Keyword
    Abiotic stress
    Non-parasitic necrosis
    Physiological leaf spot
    Date
    2016-01-13
    
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    URI
    http://hdl.handle.net/11019/1042 http://dx.doi.org/10.1515/ijafr-2015-0005; http://dx.doi.org/10.1515/ijafr-2015-0005
    Citation
    Moran, M., Dix, P. & Burke, J. (2016). Microarray analysis of spring barley cultivars displaying differing sensitivity to physiological leaf spot (PLS). Irish Journal of Agricultural and Food Research, 54(1), pp. 48-58. doi:10.1515/ijafr-2015-0005
    Abstract
    Physiological leaf spot (PLS) is a disorder of spring barley (Hordeum vulgare L.), which has become more pronounced in recent years. The initial symptoms are small chlorotic/brown spots on the upper four leaves, which may develop into necrotic lesions with an irregular shape. As PLS occurs on leaves that are directly exposed to sunlight, it is thought that high light stress could be a trigger for the condition. This study concentrates on two cultivars, Cooper and Crusader, which display differential sensitivity to PLS. Biochemical measurements and enzyme assays revealed substantial difference in levels of ascorbate, type III peroxidases, and superoxide dismutase between the chosen cultivars during the 2003 growing season. A global gene expression study, using these field samples, was performed by microarray analysis. This supported the biochemical findings and highlighted additional sets of genes differentially expressed between the cultivars. Transcripts of particular interest, which appeared, included calcium signalling genes, cold-responsive genes and those involved in the assembly of Photosystem I. We conclude that susceptibility to PLS is related to levels of expression of genes with a role in countering the effects of oxidative stress.
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    IJAFR, volume 54, no 1, 2015

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