The Dis1/Stu2/XMAP215 Family Gene Fg Stu2 Is Involved in Vegetative Growth, Morphology, Sexual and Asexual Reproduction, Pathogenicity and DON Production of Fusarium graminearum

• Published in: Frontiers in microbiology Vol. 11; p. 545015
• Main Authors: Zhu, Yuanye, Zhang, Yuanshuai, Liu, Na, Ren, Weichao, Hou, Yiping, Duan, Yabing, Song, Xiushi, Zhou, Mingguo
• Format: Journal Article
• Language: English
• Published: Switzerland 2020
• Subjects: microtubule; Fusarium graminearum; morphology; FgStu2; DON production; sexual and asexual reproduction; vegetative growth
• ISSN: 1664-302X; 1664-302X

The conserved Dis1/Stu2/XMAP215 microtubule association proteins (MAPs) family plays an important role in microtubule dynamics, nucleation, and kinetochore-microtubule attachments. However, function of Dis1/Stu2/XMAP215 homolog in plant pathogenic fungi has not been determined. Here, we identified and investigated the Dis1/Stu2/XMAP215 homolog (FGSG_10528) in ( Stu2p). Co-localization experiment and co-immunoprecipitation (Co-IP) assay demonstrated that Stu2p is a microtubule associated protein. Besides, Stu2 could also interact with γ-tubulin and presumed Ndc80, which suggested that the Stu2 gene might associate with microtubule nucleation and kinetochore-microtubule attachments like Dis1/Stu2/XMAP215 homologs in other species. Moreover, the Stu2 promoter replacement mutants ( Stu2-Si mutants) produced twisted hyphae and decreased growth rate. Microscope examination further showed that the microtubule polymerization was reduced in Stu2-Si mutants, which could account for the aberrant morphology. Although the microtubule polymerization was affected in Stu2-Si mutants, the Stu2-Si mutants didn't show highly increased sensitivity to anti-microtubule fungicide carbendazim (methyl benzimidazol-2-ylcarbamate [MBC]). In addition, the Stu2-Si mutants exhibited curved conidia, decreased number of conidial production, blocked ability of perithecia production, decreased pathogenicity and deoxynivalenol (DON) production. Taken together, these results indicate that the Stu2 gene plays a crucial role in vegetative growth, morphology, sexual reproduction, asexual reproduction, virulence and deoxynivalenol (DON) production of , which brings new insights into the functions of Dis1/Stu2/XMAP215 homolog in plant pathogenic fungi.