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Chen L, Wei X, Liu GL, Hu Z, Chi ZM, Chi Z. Glycerol, trehalose and vacuoles had relations to pullulan synthesis and osmotic tolerance by the whole genome duplicated strain Aureobasidium melanogenum TN3-1 isolated from natural honey. Int J Biol Macromol 2020; 165:131-140. [PMID: 32987074 DOI: 10.1016/j.ijbiomac.2020.09.149] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2020] [Revised: 09/05/2020] [Accepted: 09/20/2020] [Indexed: 10/23/2022]
Abstract
In our previous study, it was found that Aureobasidium melanogenum TN3-1 was a high pullulan producing and osmotic tolerant yeast-like fungal strain. In this study, the HOG1 signaling pathway controlling glycerol synthesis, glycerol, trehalose and vacuoles were found to be closely related to its pullulan biosynthesis and high osmotic tolerance. Therefore, deletion of the key genes for the HOG1 signaling pathway, glycerol and trehalose biosynthesis and vacuole formation made all the mutants reduce pullulan biosynthesis and increase sensitivity of the growth of the mutants to high glucose concentration. Especially, abolishment of both the VSP11 and VSP12 genes which controlled the fission/fusion balance of vacuoles could cause big reduction in pullulan production (less than 7.4 ± 0.4 g/L) by the double mutant ΔDV-5 and increased sensitivity to high concentration glucose, while expression of the VSP11 gene in the double mutant ΔDV-5 made the transformants EV-2 restore pullulan production and tolerance to high concentration glucose. But cell growth of them were the similar. The double mutant ΔDV-5 had much bigger vacuoles and less numbers of vacuoles than the transformant EV-2 and its wild type strain TN3-1 while it grew weakly on the plate with 40% (w/v) glucose while the transformant EV-2 and its wild type strain TN3-1 could grow normally on the plate even with 60% (w/v) glucose. The double mutant ΔDV-5 also had high level of pigment and its cells were swollen. This was the first time to give the evidence that glycerol, trehalose and vacuoles were closely related to pullulan biosynthesis and high osmotic tolerance by A. melanogenum.
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Affiliation(s)
- Lu Chen
- College of Marine Life Sciences, Ocean University of China, Yushan Road, No. 5, Qingdao, China
| | - Xin Wei
- College of Marine Life Sciences, Ocean University of China, Yushan Road, No. 5, Qingdao, China
| | - Guang-Lei Liu
- College of Marine Life Sciences, Ocean University of China, Yushan Road, No. 5, Qingdao, China; Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, 266003 Qingdao, China
| | - Zhong Hu
- Department of Biology, Shantou University, Shantou 515063, China
| | - Zhen-Ming Chi
- College of Marine Life Sciences, Ocean University of China, Yushan Road, No. 5, Qingdao, China; Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, 266003 Qingdao, China.
| | - Zhe Chi
- College of Marine Life Sciences, Ocean University of China, Yushan Road, No. 5, Qingdao, China; Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, 266003 Qingdao, China
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Lu Y, Che J, Xu X, Pang B, Zhao X, Liu Y, Shi J. Metabolomics Reveals the Response of the Phenylpropanoid Biosynthesis Pathway to Starvation Treatment in the Grape Endophyte Alternaria sp. MG1. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2020; 68:1126-1135. [PMID: 31891261 DOI: 10.1021/acs.jafc.9b05302] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Phenylpropanoid (PPPN) compounds are widely used in agriculture, medical, food, and cosmetic industries because of their multiple bioactivities. Alternaria sp. MG1, an endophytic fungus isolated from grape, is a new natural source of PPPNs. However, the PPPN biosynthesis pathway in MG1 tends to be suppressed under normal growth conditions. Starvation has been reported to stimulate the PPPN pathway in plants, but this phenomenon has not been well studied in endophytic fungi. Here, metabolomics analysis was used to examine the profile of PPPN compounds, and quantitative reverse transcription-polymerase chain reaction was used to detect the expression of key genes in the PPPN biosynthesis pathway under starvation conditions. Starvation treatment significantly increased the accumulation of shikimate and PPPN compounds and upregulated the expression of key genes in their biosynthesis pathways. In addition to previously reported PPPNs, sinapate, 4-hydroxystyrene, piceatannol, and taxifolin were also detected under starvation treatment. These findings suggest that starvation treatment provides an effective way to optimize the production of PPPN compounds and may permit the investigation of compounds that are undetectable under normal conditions. Moreover, the diversity of its PPPNs makes strain MG1 a rich repository of valuable compounds and an extensive genetic resource for future studies.
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Affiliation(s)
- Yao Lu
- Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences , Northwestern Polytechnical University , 127 Youyi West Road , Xi'an , Shaanxi Province 710072 , China
| | - Jinxin Che
- Department of Biological and Food Engineering, College of Chemical Engineering , Xiangtan University , Xiangtan , Hunan 411105 , China
| | - Xiaoguang Xu
- Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences , Northwestern Polytechnical University , 127 Youyi West Road , Xi'an , Shaanxi Province 710072 , China
| | - Bing Pang
- Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences , Northwestern Polytechnical University , 127 Youyi West Road , Xi'an , Shaanxi Province 710072 , China
| | - Xixi Zhao
- Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences , Northwestern Polytechnical University , 127 Youyi West Road , Xi'an , Shaanxi Province 710072 , China
| | - Yanlin Liu
- College of Enology , Northwest A&F University , 22 Xinong Road , Yangling , Shaanxi Province 712100 , China
| | - Junling Shi
- Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences , Northwestern Polytechnical University , 127 Youyi West Road , Xi'an , Shaanxi Province 710072 , China
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Bordin ER, Frumi Camargo A, Rossetto V, Scapini T, Modkovski TA, Weirich S, Carezia C, Barretta Franceschetti M, Balem A, Golunski SM, Galon L, Funghetto Fuzinatto C, Reichert Júnior FW, Fongaro G, Mossi AJ, Treichel H. Non-Toxic Bioherbicides Obtained fromTrichoderma koningiopsisCan Be Applied to the Control of Weeds in Agriculture Crops. Ind Biotechnol (New Rochelle N Y) 2018. [DOI: 10.1089/ind.2018.0007] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Affiliation(s)
- Eduarda Roberta Bordin
- Laboratory of Microbiology and Bioprocess, Federal University of Fronteira Sul, Erechim, Brazil
| | - Aline Frumi Camargo
- Laboratory of Microbiology and Bioprocess, Federal University of Fronteira Sul, Erechim, Brazil
| | - Vanusa Rossetto
- Laboratory of Microbiology and Bioprocess, Federal University of Fronteira Sul, Erechim, Brazil
| | - Thamarys Scapini
- Laboratory of Microbiology and Bioprocess, Federal University of Fronteira Sul, Erechim, Brazil
| | | | - Sabrina Weirich
- Laboratory of Agroecology, Federal University of Fronteira Sul, Erechim, Brazil
| | - Carine Carezia
- Laboratory of Agroecology, Federal University of Fronteira Sul, Erechim, Brazil
| | | | - Andressa Balem
- Ecology and Conservation Laboratory, Federal University of Fronteira Sul, Erechim, Brazil
| | - Simone Maria Golunski
- Laboratory of Microbiology and Bioprocess, Federal University of Fronteira Sul, Erechim, Brazil
| | - Leandro Galon
- Laboratory of Sustainable Management of Agricultural Systems, Federal University of Fronteira Sul, Erechim, Brazil
| | | | | | - Gislaine Fongaro
- Laboratory of Microbiology and Bioprocess, Federal University of Fronteira Sul, Erechim, Brazil
| | - Altemir José Mossi
- Laboratory of Agroecology, Federal University of Fronteira Sul, Erechim, Brazil
| | - Helen Treichel
- Laboratory of Microbiology and Bioprocess, Federal University of Fronteira Sul, Erechim, Brazil
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Stress tolerance and virulence of insect-pathogenic fungi are determined by environmental conditions during conidial formation. Curr Genet 2015; 61:383-404. [PMID: 25791499 DOI: 10.1007/s00294-015-0477-y] [Citation(s) in RCA: 104] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2014] [Revised: 01/29/2015] [Accepted: 01/30/2015] [Indexed: 01/07/2023]
Abstract
The virulence to insects and tolerance to heat and UV-B radiation of conidia of entomopathogenic fungi are greatly influenced by physical, chemical, and nutritional conditions during mycelial growth. This is evidenced, for example, by the stress phenotypes of Metarhizium robertsii produced on various substrates. Conidia from minimal medium (Czapek's medium without sucrose), complex medium, and insect (Lepidoptera and Coleoptera) cadavers had high, moderate, and poor tolerance to UV-B radiation, respectively. Furthermore, conidia from minimal medium germinated faster and had increased heat tolerance and were more virulent to insects than those from complex medium. Low water-activity or alkaline culture conditions also resulted in production of conidia with high tolerance to heat or UV-B radiation. Conidia produced on complex media exhibited lower stress tolerance, whereas those from complex media supplemented with NaCl or KCl (to reduce water activity) were more tolerant to heat and UV-B than those from the unmodified complex medium. Osmotic and nutritive stresses resulted in production of conidia with a robust stress phenotype, but also were associated with low conidial yield. Physical conditions such as growth under illumination, hypoxic conditions, and heat shock before conidial production also induced both higher UV-B and heat tolerance; but conidial production was not decreased. In conclusion, physical and chemical parameters, as well as nutrition source, can induce great variability in conidial tolerance to stress for entomopathogenic fungi. Implications are discussed in relation to the ecology of entomopathogenic fungi in the field, and to their use for biological control. This review will cover recent technologies on improving stress tolerance of entomopathogenic fungi for biological control of insects.
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