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• W2764295280 abstract "Aspergillus niger is a common pathogenic fungus causing postharvest rot of fruit and vegetable, whereas the knowledge on virulence factors is very limited. Superoxide dismutase [SOD (EC 1.15.1.10)] is an important metal enzyme in fungal defense against oxidative damage. Thus, we try to study whether Cu/Zn-SOD is a virulence factor in A. niger . Cu/Zn-SOD encoding gene sodC was deleted in A. niger [MA70.15 (wild type)] by homologous recombination. The deletion of sodC led to decreased SOD activity in A. niger , suggesting that sodC did contribute to full enzyme activity. Δ sodC strain showed normal mycelia growth and sporulation compared with wild type. However, sodC deletion markedly increased the cell’s sensitivity to intracellular superoxide anion generator menadione. Besides, spore germination under menadione and H 2 O 2 stresses were significantly retarded in Δ sodC mutant compared with wild type. Further results showed that sodC deletion induced higher superoxide anion production and higher content of H 2 O 2 and malondialdehyde (MDA) compared with wild type, supporting the role of SOD in metabolism of reactive oxygen species (ROS). Furthermore, Δ sodC mutant had a reduced virulence on chinese white pear ( Pyrus bretschneideri ) as lesion development by Δ sodC was significantly less than wild type. The determination of superoxide anion, H 2 O 2 , and MDA in A. niger -infected pear showed that chinese white pear infected with Δ sodC accumulated less superoxide anion, H 2 O 2 , and MDA compared with that of wild type A. niger , implying that Δ sodC induced an attenuated response in chinese white pear during fruit–pathogen interaction. Our results indicate that sodC gene contributes to the full virulence of A. niger during infection on fruit. Aspergillus niger is one of the most common species found in fungal communities. It is an important fermentation industrial strain and is also known to cause the most severe symptoms in fruit during long-term storage (Pel et al., 2007). Meanwhile, plants activate their signaling pathways to trigger defense responses to limit pathogen expansion. One of the earliest host responses after pathogen attack is oxidative burst, during which large quantities of ROS are generated by different host enzyme systems, such as glucose oxidase (Govrin and Levine, 2000). ROS such as singlet oxygen, superoxide anion, hydroxyl (OH − ), and H 2 O 2 are released to hinder the advance of pathogens (Gara et al., 2003). ROS can react with and damage cellular molecules, such as DNA, protein, and lipids, which will limit fungal propagation in the host plant (Apel and Hirt, 2004)." @default.
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• W2764295280 date "2017-09-01" @default.
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• W2764295280 title "Deletion of Cu/Zn Superoxide Dismutase Gene sodC Reduces Aspergillus niger Virulence on Chinese White Pear" @default.
• W2764295280 doi "https://doi.org/10.21273/jashs04169-17" @default.
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