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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Laccase Gene Sh-lac Is Involved in the Growth and Melanin Biosynthesis of Scleromitrula shiraiana.
Phytopathology 2017 March
Scleromitrula shiraiana causes the popcorn disease in mulberry trees resulting in severe economic losses. Previous studies have shown that melanin may play a vital role in establishing the pathogenicity of fungi. In the present study, we identified the melanin produced in S. shiraiana belongs to DHN melanin by gas chromatography-mass spectrometry, and cloned the laccase Sh-lac, a potential DHN melanin biosynthesis gene from S. shiraiana. We obtained two stable Sh-lac silenced transformants using RNAi, ilac-4 and 8 to elucidate the DHN melanin biosynthetic pathway in S. shiraiana. The melanin production of ilac-4 and ilac-8 was significantly reduced, and their vegetative growth was also suppressed. Results such as these led to a proposal that Sh-lac played a key role in DHN melanin formation in S. shiraiana and may function differentially with other melanin biosynthetic genes. The inhibition of melanin was accompanied by the decrease of oxalic acid and the adhesion of hyphae was impaired. Our results indicated that laccase was an important enzyme in the synthesis of melanin and might play a critical role in the pathogenicity of S. shiraiana.
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