Mechanisms in Growth-Promoting of Cucumber by the Endophytic Fungus Chaetomium globosum Strain ND35

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2022
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Tian, Yehan
Fu, Xuesong
Zhang, Gongchen
Zhang, Rui
Kang, Zhensheng
Gao, Kexiang
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Journal of Fungi. MDPI. 2022, 8(2), 180. eISSN 2309-608X. Available under: doi: 10.3390/jof8020180
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Endophytic fungi are effective in plant growth and development by secreting various kinds of plant hormones and nutrients. However, the cellular and molecular interactions between the endophytic fungi and plant growth-promoting have remained less explored. The present study was designed to explore the effects of the infection and colonization events of Chaetomium globosum strain ND35 on cucumber growth and the expression pattern of some metabolically important genes in development of the cucumber radicle. The results demonstrated that strain ND35 can infect and colonize the outer layers (cortical cells) of cucumber root and form a symbiotic structure with the host cell, similar to a periarbuscular membrane and establish chemical communication with the plant. Through transcriptome analysis, we found the differentially expressed genes (DEGs) caused by strain ND35 were mainly enriched in phenylpropanoid biosynthesis, plant hormone signal transduction, plant-pathogen interaction and photosynthesis. Correspondingly, the contents of reactive oxygen species (ROS), hydrogen peroxide (H2O2), indole-3-acetic acid (IAA), gibberellin (GA), zeatin (ZT), salicylic acid (SA), jasmonic acid (JA) and the activity of phenylalanine ammonia lyase (PAL), 4-coumarate-CoA ligase (4CL), cinnamyl alcohol dehydrogenase (CAD), and peroxidase (POD) in ND35-colonized seedlings were generally higher than those of non-inoculated seedlings. Overall, the infection and colonization events of C. globosum strain ND35 increased cucumber growth through complex regulation of plant hormones biosynthesis and metabolism. Furthermore, although the endophytic fungus strain ND35 produced IAA, GA, ZT, and ergosterol in the fermentation broth, and there are enabled to promote growth of cucumber, it is uncertain whether there are ND35-derived microbial hormones in plants. This study of the interaction between cucumber and strain ND35 contributes to a better understanding of the plant-endophytic fungi interactions, and may help to develop new strategies for crop production.

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ISO 690TIAN, Yehan, Xuesong FU, Gongchen ZHANG, Rui ZHANG, Zhensheng KANG, Kexiang GAO, Kurt MENDGEN, 2022. Mechanisms in Growth-Promoting of Cucumber by the Endophytic Fungus Chaetomium globosum Strain ND35. In: Journal of Fungi. MDPI. 2022, 8(2), 180. eISSN 2309-608X. Available under: doi: 10.3390/jof8020180
BibTex
@article{Tian2022-02-11Mecha-57195,
  year={2022},
  doi={10.3390/jof8020180},
  title={Mechanisms in Growth-Promoting of Cucumber by the Endophytic Fungus Chaetomium globosum Strain ND35},
  number={2},
  volume={8},
  journal={Journal of Fungi},
  author={Tian, Yehan and Fu, Xuesong and Zhang, Gongchen and Zhang, Rui and Kang, Zhensheng and Gao, Kexiang and Mendgen, Kurt},
  note={Article Number: 180}
}
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