Orginal Article |
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Folpcs1 Is Responsible for Asexual Reproduction and Vegetative Growth in Fusarium oxysporum f. sp. Lini. |
GUO Jing,HOU Zhan-ming() |
College of Life Sciences and Technology, Inner Mongolia Normal University, Hohhot 010022, China |
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Abstract Fusarium oxysporum f.sp.Lini, a forma specialis of Fusarium oxysporum on flax, is soil-borne fungus which causes Fusarium wilt of flax, a serious disease of flax resulting in great loss of yield and quality of the crop. It has been identified that C2H2 zinc finger transcription factor Pcs1 in Fusarium graminearum is responsible for the generation of conidia produced from intercalary phialides on hyphae. Objective:The gene disruption of the Folpcs1 is performed according the principle of homologous recombination for identifying the function of the Folpcs1, the homologous gene of the pcs1, in Fusarium oxysporum f. sp. Lini. Methods:The disruption of the gene was made by the Split-Marker strategy after the genomic and complementary DNA was sequenced. The deletion cassettes containing a hygromycin resistance gene (hph) was constructed and transformed into protoplast of the wild type of the fungus mediated by polyethylene glycol. The deletion mutants, ΔFolpcs1s, were obtained and confirmed by PCR using positive and negative primer. To make complementation for the deletion mutuant, the coding frame sequence of the Folpcs1 gene, together with its upstream and downstream flanking sequence, was cloned into the pZWH1 containing neomycin resistant gene and transformed into the deletion mutant. Results:The sequencing revealed that the gene contained one intron of 654bp and the whole cDNA sequence consisted of 2 846bp. The morphological and microscopic observation found that growth rate of deletion mutant significantly reduced and the conidium was hardly observed in culture mixture of the mutant. The revertant recovered in normal growth and conidiogenesis of the wild type. Conclusion:The results suggest that Folpcs1 is responsible for asexual reproduction and vegetative growth in Fusarium oxysporum f. sp. Lini.
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Received: 29 August 2019
Published: 18 April 2020
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Corresponding Authors:
Zhan-ming HOU
E-mail: houzhm@imnu.edu.cn
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