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Current Genetics

, Volume 65, Issue 5, pp 1229–1242 | Cite as

Cla4 PAK-like kinase is required for pathogenesis, asexual/sexual development and polarized growth in Bipolaris maydis

  • Yuki Kitade
  • Takuya Sumita
  • Kosuke Izumitsu
  • Chihiro TanakaEmail author
Original Article
  • 136 Downloads

Abstract

PAK (p21-activated protein kinases)-like kinases are master regulators of development and morphogenesis, which were conserved among eukaryotes, including fungi. In budding yeast, two types of PAK-like kinases, Ste20 and Cla4 have distinct but shared roles in the regulation of pseudohyphal development, budding and mating. In this study, to examine the broad functions of PAK-like kinases in growth, pathogenicity and asexual/sexual reproduction in filamentous fungi, we identified and characterized two PAK-like kinases, Ste20 and Cla4 in Bipolaris maydis. A single mutant of both Ste20 and Cla4 gene was viable, while the double mutant was not available, possibly because of lethality. In growth, conidiation, and pathogenicity, Δste20 strains showed phenotypes similar to those of the wild-type, while Δcla4 strains showed severely defected phenotypes. In this study, we also clarified that Ste20 is partially involved in pseudothecium development but is dispensable for maternity, while Cla4 is essential for maternal pseudothecium development and also involve in ascospore development in paternal pseudothecium. Fluorescent microscopy visualized the disorder in cell polarity at the hyphal tip in Δcla4. These results suggested that not Ste20 but Cla4 is a master regulator of growth, pathogenicity and asexual/sexual development in B. maydis. In addition, we successfully visualized alternation of branching pattern and distribution of Spitzenkörper at the hyphal tip in Δcla4 strains.

Keywords

Appressorium Cochliobolus heterostrophus Paternity Spitzenkörper Ste20 Tip splitting 

Notes

Acknowledgements

Part of this work was financially supported by Grants-In-Aid for Scientific Research from the Japan Society for the Promotion of Science (no. 15J00381 for YK and no. 15K07311 for CT).

Compliance with ethical standards

Conflict of interest

The authors declare no conflict of interest. All the experiments undertaken in this study comply with the current laws of Japan, where the research was performed.

Supplementary material

294_2019_977_MOESM1_ESM.pptx (102 kb)
Fig. S1 PAK-like kinase gene disruption/reconstitution and confirmation. A: Schematic illustration of PAK-like kinase gene disruption and the location of primers. B: The result of PCR confirmation of Ste20 gene disruption. Each lane shows as follows. λ: λ/StyI digest, W: WT, 1-4: Disruptants, L: 100 bp ladder, R: Reconstituted-strain. C: The result of PCR confirmation of Cla4 gene disruption. Each lane showed as follows. λ: λ/StyI digest, W: WT, 1-4: Disruptants, L: 100 bp ladder, R: Reconstituted strain (PPTX 101 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Yuki Kitade
    • 1
  • Takuya Sumita
    • 1
  • Kosuke Izumitsu
    • 1
    • 2
  • Chihiro Tanaka
    • 1
    Email author
  1. 1.Laboratory of Environmental Mycoscience, Graduate School of AgricultureKyoto UniversityKyotoJapan
  2. 2.Graduate School of Environmental ScienceThe University of Shiga PrefectureHikone CityJapan

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