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Open AccessArticle

High Humidity Causes Abnormalities in the Process of Appressorial Formation of Blumeria graminis f. sp. hordei

1
Department of Agriculture, Ehime University, Tarumi, Matsuyama, Ehime 790-8566, Japan
2
RIKEN Center for Sustainable Resource Science, Yokohama, Kanagawa 230-0045, Japan
3
Research Unit for Citromics, Ehime University, Tarumi, Matsuyama, Ehime 790-8566, Japan
*
Author to whom correspondence should be addressed.
Pathogens 2020, 9(1), 45; https://doi.org/10.3390/pathogens9010045
Received: 5 December 2019 / Revised: 26 December 2019 / Accepted: 1 January 2020 / Published: 5 January 2020
(This article belongs to the Section Plant Pathogens)
High humidity decreases the penetration rate of barley powdery mildew Blumeria graminis f. sp. hordei. However, the mechanism is not well understood. In this study, the morphological and cytochemical analyses revealed that substances containing proteins leaked from the tip of the appressorial germ tube of conidia without the formation of appressorium under a high humidity condition. In addition, exposure to high humidity prior to the formation of appressorium caused the aberrant formation of the appressorial germ tube without appressorium formation, resulting in failure to penetrate the host cell. These findings suggest that the formation and maturation of the appressorium requires a low humidity condition, and will be clues to improve the disease management by humidity control. View Full-Text
Keywords: Blumeria graminis f. sp. hordei; Hordeum vulgare; appressorium; humidity Blumeria graminis f. sp. hordei; Hordeum vulgare; appressorium; humidity
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Sugai, K.; Inoue, H.; Inoue, C.; Sato, M.; Wakazaki, M.; Kobayashi, K.; Nishiguchi, M.; Toyooka, K.; Yamaoka, N.; Yaeno, T. High Humidity Causes Abnormalities in the Process of Appressorial Formation of Blumeria graminis f. sp. hordei. Pathogens 2020, 9, 45.

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