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Two sides of a leaf blade: Blumeria graminis needs chemical cues in cuticular waxes of Lolium perenne for germination and differentiation

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Abstract

Plant surface characteristics were repeatedly shown to play a pivotal role in plant–pathogen interactions. The abaxial leaf surface of perennial ryegrass (Lolium perenne) is extremely glossy and wettable compared to the glaucous and more hydrophobic adaxial surface. Earlier investigations have demonstrated that the abaxial leaf surface was rarely infected by powdery mildew (Blumeria graminis), even when the adaxial surface was densely colonized. This led to the assumption that components of the abaxial epicuticular leaf wax might contribute to the observed impairment of growth and development of B. graminis conidia on abaxial surfaces of L. perenne. To re-assess this hypothesis, we analyzed abundance and chemical composition of L. perenne ab- and adaxial epicuticular wax fractions. While the adaxial epicuticular waxes were dominated by primary alcohols and esters, the abaxial fraction was mainly composed of n-alkanes and aldehydes. However, the major germination and differentiation inducing compound, the C26-aldehyde n-hexacosanal, was not present in the abaxial epicuticular waxes. Spiking of isolated abaxial epicuticular Lolium waxes with synthetically produced n-hexacosanal allowed reconstituting germination and differentiation rates of B. graminis in an in vitro germination assay using wax-coated glass slides. Hence, the absence of the C26-aldehyde from the abaxial surface in combination with a distinctly reduced surface hydrophobicity appears to be primarily responsible for the failure of normal germling development of B. graminis on the abaxial leaf surfaces of L. perenne.

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Abbreviations

agt:

Appressorial germ tube

app:

Appressorium

sgt:

Secondary germ tube

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Acknowledgments

The authors thank Olga Frank and Nadine Geudner for excellent technical assistance, Vanessa Zabka, Tanja Gulder and Gerhard Bringmann for the synthesis of n-hexacosanal. This project was financially supported by the Deutsche Forschungsgemeinschaft (Sonderforschungsbereich 567).

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  1. Universität Würzburg, Julius-von-Sachs-Institut für Biowissenschaften, Lehrstuhl für Botanik II, 97082, Würzburg, Germany

    Anna Ringelmann, Michael Riedel, Markus Riederer & Ulrich Hildebrandt

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  1. Anna Ringelmann
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  2. Michael Riedel
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  3. Markus Riederer
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  4. Ulrich Hildebrandt
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Correspondence to Ulrich Hildebrandt.

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Ringelmann, A., Riedel, M., Riederer, M. et al. Two sides of a leaf blade: Blumeria graminis needs chemical cues in cuticular waxes of Lolium perenne for germination and differentiation. Planta 230, 95–105 (2009). https://doi.org/10.1007/s00425-009-0924-4

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