Hydrophobin HFBII-4 from Trichoderma asperellum induces antifungal resistance in poplar
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Herein, the class II hydrophobin gene HFBII-4 was cloned from the biocontrol agent Trichoderma asperellum ACCC30536 and recombinant rHFBII-4 was expressed in Pichia pastoris GS115. Treatment of Populus davidiana × P. alba var. pyramidalis (PdPap poplar) with rHFBII-4 altered the expression levels of genes in the auxin, salicylic acid (SA), and jasmonic acid (JA) signal transduction pathways. Polyphenol oxidase (PPO) and phenylalanine ammonia lyase (PAL) enzyme activities were induced with rHFBII-4. Evans Blue and nitro blue tetrazolium (NBT) staining indicated that cell membrane permeability and reactive oxygen species were lower in the leaves of plants treated with rHFBII-4. The chlorophyll content was higher than that of control at 2–5 days after treatment. Furthermore, poplar seedlings were inoculated with Alternaria alternata, disease symptoms were observed. The diseased area was smaller in leaves induced with rHFBII-4 compared with control. In summary, rHFBII-4 enhances resistance to A. alternata.
KeywordsBiocontrol Trichoderma sp. Yeast expression Hydrophobin Populus davidiana × P. alba var. pyramidalis
This work was supported by the National High Technology Research and Development Program (the 13th Five-Year Plan Program) [grant number 2016YFC0501505] and the Fundamental Research Funds of the Central University, China [grant numbers 2572017CA06 and 2572014BA15].
Compliance with ethical standards
The manuscript does not contain experiments using animal or human studies.
Conflict of interest
The authors declare that they have no conflict of interest.
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