The sensor protein AaSln1 is involved in differentiation of infection structures, osmotic stress tolerance and virulence in Alternaria alternata

Yuan, Jing; Liu, Yongxiang; Li, Yongcai; Zong, Yuanyuan; Bi, Yang; Prusky, Dov B.

doi:10.1016/j.postharvbio.2023.112697

Postharvest Biology and Technology

2024

DOI: 10.1016/j.postharvbio.2023.112697

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The sensor protein AaSln1 is involved in differentiation of infection structures, osmotic stress tolerance and virulence in Alternaria alternata

Jing Yuan,

Yongxiang Liu,

Yongcai Li

et al.

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2024

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AaSlt2 Is Required for Vegetative Growth, Stress Adaption, Infection Structure Formation, and Virulence in Alternaria alternata

Jiang,

Wang,

et al. 2024

JoF

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Slt2 is an important component of the Slt2-MAPK pathway and plays critical regulatory roles in growth, cell wall integrity, melanin biosynthesis, and pathogenicity of plant fungi. AaSlt2, an ortholog of the Saccharomyces cerevisiae Slt2 gene, was identified from A. alternata in this study, and its function was clarified by knockout of the gene. The ΔAaSlt2 strain of A. alternata was found to be defective in spore morphology, vegetative growth, and sporulation. Analysis of gene expression showed that expression of the AaSlt2 gene was significantly up-regulated during infection structure formation of A. alternata on hydrophobic and pear wax extract-coated surfaces. Further tests on onion epidermis confirmed that spore germination was reduced in the ΔAaSlt2 strain, together with decreased formation of appressorium and infection hyphae. Moreover, the ΔAaSlt2 strain was sensitive to cell wall inhibitors, and showed significantly reduced virulence on pear fruit. Furthermore, cell wall degradation enzyme (CWDE) activities, melanin accumulation, and toxin biosynthesis were significantly lower in the ΔAaSlt2 strain. Overall, the findings demonstrate the critical involvement of AaSlt2 in growth regulation, stress adaptation, infection structure formation, and virulence in A. alternata.

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AaSlt2 Is Required for Vegetative Growth, Stress Adaption, Infection Structure Formation, and Virulence in Alternaria alternata

Jiang,

Wang,

et al. 2024

JoF

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show abstract

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The sensor protein AaSln1 is involved in differentiation of infection structures, osmotic stress tolerance and virulence in Alternaria alternata

Cited by 1 publication

References 36 publications

AaSlt2 Is Required for Vegetative Growth, Stress Adaption, Infection Structure Formation, and Virulence in Alternaria alternata

AaSlt2 Is Required for Vegetative Growth, Stress Adaption, Infection Structure Formation, and Virulence in Alternaria alternata

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