期刊
FUNGAL GENETICS AND BIOLOGY
卷 88, 期 -, 页码 1-12出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.fgb.2016.01.010
关键词
Cryphonectria parasitica; Cdc48; Heterokaryon; Hypovirulence
资金
- NRF grant by MSIP [2015R1A2A1A10055684]
- BK21 PLUS program in Department of Bioactive Material Sciences
- National Research Foundation of Korea [2015R1A2A1A10055684] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Functional analysis of a cell division cycle 48 (CDC48) ortholog, CpCdc48, from Cryphonectria parasitica was performed via construction of a CpCdc48-null mutant. Genotype analysis revealed that the putative CpCdc48-null mutant was a heterokaryotic transformant containing two different types of nuclei (i.e., one with the wild-type CpCdc48 allele and the other with the CpCdc48-null mutant allele). Although stable mycelial growth of the heterokaryotic transformant was observed on media containing hygromycin B, neither germination nor growth of the resulting spores was observed on selection media, suggesting that the CpCdc48 gene is essential. Microscopic analysis of germinated conidia from the heterokaryon demonstrated that although there were normal germinating spores due to the wild-type conidia, there were many residual conidia that did not germinate. However, with prolonged incubation, non-germinating conidia began to swell into gigantic globose spores. DAPI staining and FACS analysis of the gigantic spores revealed the presence of multiple nuclei. These gigantic conidia did not show any signs of polarized growth and underwent autolysis with further incubation. These findings indicate that the CpCdc48 gene is responsible for delayed cell cycle during spore germination, resulting in some karyokinesis, but not following spore cytokinesis. Thus, CpCdc48 is essential for cell division and polarized growth. (C) 2016 Elsevier Inc. All rights reserved.
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