Phenylalanine Promotes Biofilm Formation of <i>Meyerozyma caribbica</i> to Improve Biocontrol Efficacy against Jujube Black Spot Rot
Qian Deng | Xingmeng Lei | Hongyan Zhang | Lili Deng | Lanhua Yi | Kaifang Zeng
During storage and transportation after harvest, the jujube fruit is susceptible to black spot rot, which is caused by <i>Alternaria alternata</i>. The present study aimed to evaluate the effectiveness of the yeast <i>Meyerozyma caribbica</i> in controlling <i>A. alternata</i> in postharvest jujube fruits, and to explore the biofilm formation mechanism. The results showed that <i>M. caribbica</i> treatment significantly reduced the <i>A. alternata</i> decay in jujube fruits. <i>M. caribbica</i> could rapidly colonize jujube fruit wounds, adhering tightly to hyphae of <i>A. alternata</i>, and accompanied by the production of extracellular secretions. In <i>in vitro</i> experiments, we identified that <i>M. caribbica</i> adhered to polystyrene plates, indicating a strong biofilm-forming ability. Furthermore, we demonstrated that <i>M. caribbica</i> can secrete phenylethanol, a quorum sensing molecule which can affect biofilm development. Phenylalanine (a precursor substance for phenylethanol synthesis) enhanced the secretion of phenylethanol and promoted the formation of <i>M. caribbica</i> biofilms. Meanwhile, phenylalanine enhanced the biological control performance of <i>M. caribbica</i> against jujube black spot rot. Our study provided new insights that enhance the biological control performance of antagonistic yeast.
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