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中国科技论文在线
MaHog1, a Hog1-type MAP kinase gene, contributes to
stress tolerance and virulence of the entomopathogenic
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fungus, Metarhizium acridum#
Jin Kai, Ming Yue, Xia Yuxian**
(Genetic Engineering Research Center, Chongqing University, ChongQing 400030)
Abstract: Fungal biocontrol agents have great potential in integrated pest management. However, the
poor efficacy and secnsitiveness to various adversities have hampered their wide application. In
eukaryotic cells, Hog1 kinase play a critical role in stress responses. In this study, MaHog1 (GenBank
accession number EFY85878) encodeing a member of the Hog1/Sty1/p38 MAPK family was identified
from M. acridum. Targeted gene disruption was adopted to analyze the role of MaHog1 in virulence
and tolerance to adverse factors. Mutant depleted for MaHog1 showed increased sensitivity to high
osmotic stress, high temperature and oxidative stress and exhibited remarkable resistance to the cell
wall disturbing agents. These results suggested that Hog1 kinase has conserved function in regulating
multistress responses among fungi, and that MaHog1 might influence the cell wall biogenesis in M.
acridum. Bioassays conducted with topical inoculation and intrahaemocoel injection revealed that
MaHog1 is required for both the penetration and the postpenetration development of M. acridum.
Disruption of MaHog1 resulted in a signi?cant reduction in virulence, likely due to the combination of
a decrease in conidial germination, a reduction in appressorium formation, and a decline in growth rate
in insect haemolymph, which might be caused by impairing the fungal tolerance to various stresses
during infection.
Keywords: Microbiology; entomopathogenic fungus; MaHog1; stress tolerance; virulence
0 Introduction
Fungal biocontrol agents have great potential in integrated pest management, because of its
environmental safety and low likelihood of development of insect resistance (Charnley Collins,
2007). However, t
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