Abstract
Biocontrol fungi are widely used to promote plant growth and pest control. Four fungi were isolated from Cremastra appendiculata tubers and screened for plant growth-promoting and antagonistic effects. Based on the morphological characterization and ITS, 18S rRNA and 28S rRNA gene sequencing analysis, the fungi were identified to be related to Colletotrichum gloeosporioides (DJL-6), Trichoderma tomentosum (DJL-9), Colletotrichum godetiae (DJL-10) and Talaromyces amestolkiae (DJL-15). The growth inhibition tests showed that the four isolates had different inhibitory effects on Colletotrichum fructicola, Alternaria alternata and Alternaria longipes, among which DJL-9 showed the highest inhibitory activity. Their culture filtrates (especially that of DJL-15) can also inhibit pathogens. Four isolates were positive for the production of indole-3-acid (IAA) and β-1,3-glucanase and possessed proteolytic activity but were negative for the production of iron siderophore complexes. The four fungi showed strong nitrogen fixation and potassium dissolution abilities. In addition to DJL-9 being able to solubilize phosphate, DJL-10 was able to produce chitinase and cellulase. Pot experiments indicated that the four fungi increased the germination rate of C. appendiculata and soybean seeds and increased soybean radicle growth and plant biomass. Among them, DJL-6 had a better growth-promoting effect. Therefore, we successfully screened the biocontrol potential of endophytes from C. appendiculata, with a focus on preventing fungal diseases and promoting plant growth, and selected strains that could provide nutrients and hormones for plant growth.
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We would like to thank the anonymous reviewers for their constructive comments.
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This work was supported by the National Natural Science Foundation of China (Grant No. 81603363) and Zhejiang Traditional Chinese Medicine Administration (CN) (project No. 2019ZQ009).
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ZD and FZ designed the research and wrote the manuscript. SW, SC, QL, JZ and BW performed the experiments. SW and QL analysed the data. All the authors read and approved the manuscript.
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Wang, S., Chen, S., Wang, B. et al. Screening of endophytic fungi from Cremastra appendiculata and their potential for plant growth promotion and biological control. Folia Microbiol 68, 121–133 (2023). https://doi.org/10.1007/s12223-022-00995-0
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DOI: https://doi.org/10.1007/s12223-022-00995-0