Adhesin Gene mad2 Knockout and Functional Effects on Biological Characteristics and Inducing Plant Responses in Metarhizium anisopliae
CAI Ni,, YAN DuoZi, NONG XiangQun,, WANG GuangJun,, TU XiongBing, ZHANG ZeHuaState Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193
Abstract 【Objective】 Metarhizium anisopliae, an entomopathogenic fungus, is found also an endophyte. MAD2 is known to be one of the two adhesin proteins of M. anisopliae, which plays a vital role in adhesion and colonization in plants, but its functional mechanism is poorly understood. The objective of this study is to explore the functional effect of MAD2 protein on the characteristics of growth, virulence, adhesion and inducing plant responses in M. anisopliae by construction of the mad2 mutant strain (Δmad2) of M. anisopliae strain Ma9. 【Method】 The genomic DNA sequences of mad2 anteroposterior were obtained from NCBI, and specific primers were designed to amplify mad2 homologous arm genes S1 and S2 by PCR based on genomic DNA template of M. anisopliae strain Ma9. Meanwhile, Hyg-F/R primer pair was designed to amplify hygromycin gene with promoter sequence based on pKH-KO vector DNA template. Then, homologous knockout boxes S1H and S2H of mad2 were constructed by overlap PCR. Finally, mad2-knockout strains with stable inheritance were obtained by PEG-mediated protoplast transformation of the homologous knockout boxes. By comparing the biological characteristics of the knockout strains (Δmad2) to the wild-type strains (WT), the effects of MAD2 protein on the characteristics of M. anisopliae growth, virulence, adhesion and inducing the peanut response of symbiosis genes were analyzed. 【Result】 Homologous recombination transformants with mad2 knockout were obtained by protoplast transformation. The spore germination rate of Δmad2 was significantly decreased and spore semi-germination time was significantly prolonged 5.47 h compare to WT, as well as the mycelium length of Δmad2 was significantly shorter than WT in 12 h and 14 h incubation, which occupied 77.8% and 76.3% of WT, respectively. The sporulation in 12-day incubation was reduced by 33.3% compared to WT. The ability of Δmad2 strain adhesion in onion was significantly decreased but showed no difference in adhere to the underwings of locust. In addition, mad2-knockout did not affect the virulence of M. anisopliae to silkworm. In the peanut inoculated mad2-knockout strain for 12 h, the transcription level of symbiosis receptor gene SYMRK, calcium signal decoding related genes (CAM, CCaMK, DELLA), lipid and nitrogen transfer related genes (LTP1, NRT24, ABCC2) was significantly down-regulated compared to the treatment of WT. While compared with blank control, Δmad2 still had certainly up-regulated SYMRK transcription level, significantly inhibited the transcription levels of CAM, CCAMK and DELLA, but had no effect on the transcription level of ABCC2, LTP1 and NRT24. 【Conclusion】 M. anisopliae adhesin protein MAD2 affects spore germination, initial growth of mycelium, sporulation quantity and plants adhesion, while has no effect on insect adhesion and virulence of strain, and MAD2 triggers the transcription of peanut symbiotic genes at the initial stage of interaction between the strain and peanut. Keywords:Metarhizium anisopliae;adhesin protein MAD2;gene knockout;adhesion;virulence;growth trait
PDF (1641KB)元数据多维度评价相关文章导出EndNote|Ris|Bibtex收藏本文 本文引用格式 蔡霓, 闫多子, 农向群, 王广君, 涂雄兵, 张泽华. 绿僵菌mad2敲除株构建及其生物学和诱导植物响应的功能分析. 中国农业科学, 2021, 54(22): 4800-4812 doi:10.3864/j.issn.0578-1752.2021.22.008 CAI Ni, YAN DuoZi, NONG XiangQun, WANG GuangJun, TU XiongBing, ZHANG ZeHua. Adhesin Gene mad2 Knockout and Functional Effects on Biological Characteristics and Inducing Plant Responses in Metarhizium anisopliae. Scientia Acricultura Sinica, 2021, 54(22): 4800-4812 doi:10.3864/j.issn.0578-1752.2021.22.008
1—10:10个转化子OUT-mad2-F/R引物扩增结果 PCR amplification from 10 transformants by primer OUT-mad2-F/R;11—20为10个转化子Hyg-F/R引物扩增结果 PCR amplification from 10 transformants by primer Hyg-F/R primer Fig. 4PCR validation of 10 transformants
A:光学显微镜10×20倍,箭头所指为孢子Adherent spores (pointed by arrows) by 10×20 light microscopy;B:**:相对于野生株有极显著差异There is an extremely significant difference compared with WT (P<0.01) Fig. 5Adhesion of spores of WT and Δmad2 strains to the inner epidermis of onion and the underwings of grasshoppers
**:相对于野生株有极显著差异There is an extremely significant difference compared with WT (P<0.01);*:相对于野生株有显著差异There is a significant difference compared with WT (P<0.05) Fig. 6Comparison of spore germination rate (A), mycelium length (B) and spore output (C) between WT and Δmad2
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