Strawberry fruits are vulnerable to infection by a broad range of fungal pathogens before and after harvest. In this study, Alternaria spp. strains associated with fruit rot of strawberry were isolated and characterized and the potential of the antagonistic yeast Meyerozyma guilliermondii strain SQUCC-33Y for the control of fruit rot of strawberry was evaluated. A total of seven isolates of Alternaria (STR2-STR8) were isolated from strawberry fruits showing symptoms of rot. On the basis of internal transcribed spacer (ITS) ribosomal RNA (rRNA) sequences, these fungal isolates were identified as Alternaria alternata. Pathogenicity tests revealed that most of the strains of A. alternata were pathogenic to strawberry. The measurement of disease severity on strawberry fruits revealed significant differences in the virulence between A. alternata strains. M. guilliermondii restricted the growth of all the strains of A. alternata in dual culture assay. Postharvest treatment of strawberry fruits with M. guilliermondii significantly reduced the fruit rot lesion size caused by A. alternata. This antagonistic yeast has the potential for use as a biofungicide for the control of A. alternata-induced postharvest fruit rot of strawberry.

草莓果实在收获前后容易受到多种真菌病原体的感染。在这项研究中，链格孢属。分离并鉴定了与草莓果实腐烂有关的菌株，并评价了拮抗性酵母Meyerozyma guilliermondii菌株SQUCC-33Y防治草莓果实腐烂的潜力。从表现出腐烂症状的草莓果实中分离出总共七种链霉菌（STR2-STR8）。根据内部转录间隔区（ITS）核糖体RNA（rRNA）序列，这些真菌分离株被鉴定为链格孢。致病性测试表明，大多数菌株都来自互生曲霉对草莓有致病性。草莓果实病害严重程度的测量显示，交替链霉菌菌株之间的毒力存在显着差异。M.季也蒙受限制的所有菌株的生长链格孢双培养试验。草莓果实采后处理M.季也蒙显著降低所造成的果实腐烂损伤尺寸A.孢。这种拮抗性酵母具有用作控制真菌的交替杀虫剂诱导的草莓采后果实腐烂的潜力。