Journal
FRONTIERS IN CELLULAR AND INFECTION MICROBIOLOGY
Volume 11, Issue -, Pages -Publisher
FRONTIERS MEDIA SA
DOI: 10.3389/fcimb.2021.664366
Keywords
Ascomycota; biological characterization; Diaporthales; mycelial growth; phylogeny; taxonomy
Categories
Funding
- National Natural Science Foundation of China [31670647]
- College Student Research and Career-Creation Program of Beijing [202010022256]
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This study isolated and identified strains from Chinese wild hazelnut, discovering multiple species of Cytospora and Diaporthe fungi. The research investigated their ecological characteristics and established a database, providing a theoretical basis for disease management and prevention of hazelnut in China.
Hazelnut (Corylus heterophylla Fisch.) is an important nut crop in China but has been declining owing to the destructive effects of fungal branch canker and dieback. The identification and management of these pathogens are difficult because of the lack of attention to branch canker, insufficient understanding of phylogenetic, and overlapping morphological characteristics of the pathogens. In total, 51 strains were isolated from Chinese wild hazelnut in this study, and three species of Cytospora and two of Diaporthe were identified through morphological observation and multi-locus phylogenetic analyses (ITS, act, rpb2, tef1-alpha, and tub2 for Cytospora; ITS, cal, his3, tef1-alpha, and tub2 for Diaporthe). Three new species, Cytospora corylina, C. curvispora, and Diaporthe corylicola, and two known species, Cytospora leucostoma and Diaporthe eres, grew at 5-30 degrees C and a pH of 3.0-11.0, with optimum growth at approximately 25 degrees C and pH 4.0-7.0. Additionally, the effects of six carbon sources on mycelial growth were investigated. This study explored the main pathogenic fungi species of Corylus heterophylla, completed the corresponding database of pathogenic fungi information, and clarified their biological characteristics. Moreover, the results of this study provided a theoretical basis for Corylus heterophylla disease management and prevention in China.
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