Molecular Plant-Microbe Interactions (2002) 15, 1069-1077

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Candace Elliott, Fasong Zhou, Wolfgang Spielmeyer, Ralph Panstruga and Paul Schulze-Lefert (2002)
Functional conservation of wheat and rice Mlo orthologs in defense modulation to the powdery mildew fungus
Molecular Plant-Microbe Interactions 15 (10), 1069-1077
Abstract: Homologs of barley Mlo are found in syntenic positions in all three genomes of hexaploid bread wheat, Triticum aestivum, and in rice, Oryza sativa. Candidate wheat orthologs, designated TaMlo-A1, TaMlo-B1, and TaMlo-D1, encode three distinct but highly related proteins that are 88% identical to barley MLO and appear to originate from the three diploid ancestral genomes of wheat. TaMlo-B1 and the rice ortholog, OsMlo2, are able to complement powdery mildew-resistant barley mlo mutants at the single-cell level. Overexpression of TaMlo-B1 or barley Mlo leads to supersusceptibility to the appropriate powdery mildew formae speciales in both wild-type barley and wheat. Surprisingly, overexpression of either Mlo or TaMlo-B1 also mediates enhanced fungal development to tested inappropriate formae speciales. These results underline a regulatory role for MLO and its wheat and rice orthologs in a basal defense mechanism that can interfere with forma specialis resistance to powdery mildews.
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Link to article at publishers website
Database assignments for author(s): Ralph Panstruga

Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host
molecular biology - genes


Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.


Blumeria graminis Wheat (Triticum)