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Very-long-chain aldehydes induce appressorium formation in ascospores of the wheat powdery mildew fungus Blumeria graminis.
- Source :
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Fungal biology [Fungal Biol] 2017 Aug; Vol. 121 (8), pp. 716-728. Date of Electronic Publication: 2017 May 17. - Publication Year :
- 2017
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Abstract
- Asexually produced conidia of the wheat powdery mildew fungus Blumeria graminis f. sp. tritici (Bgt) are known to perceive cuticular very-long-chain aldehydes as signal substances strongly stimulating germination and differentiation of infection structures in a concentration- and chain-length-dependent manner. Conidial germination and appressorium formation are widely prevented by the presence of free water on the host surface. However, sexually produced ascospores can differentiate immersed in water. Applying a Formvar <superscript>®</superscript> -based in vitro-system showed that ascospore appressorium formation was strongly induced by the presence of wheat leaf cuticular wax. Similar to conidia, ascospore appressorium formation is triggered by the presence of very-long-chain aldehydes in a chain-length-dependent manner with n-octacosanal as the most inducing aldehyde. Surface hydrophobicity positively affected ascospore germination but not appressorium formation. Ascospores required significantly more time to complete the differentiation of appressoria and exhibited a more distinct dependence on the availability of free water than their conidial counterparts. Unlike conidia, ascospores showed a more variable germination and differentiation pattern even with a single germ tube differentiating an appressorium. Despite these differences our results demonstrate that a host surface recognition principle based on cuticular very-long-chain aldehydes is a common feature of B. graminis f. sp. tritici ascospores and conidia.<br /> (Copyright © 2017 British Mycological Society. Published by Elsevier Ltd. All rights reserved.)
Details
- Language :
- English
- ISSN :
- 1878-6146
- Volume :
- 121
- Issue :
- 8
- Database :
- MEDLINE
- Journal :
- Fungal biology
- Publication Type :
- Academic Journal
- Accession number :
- 28705398
- Full Text :
- https://doi.org/10.1016/j.funbio.2017.05.003