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Bodino N, Barbera R, González-Mas N, Demichelis S, Bosco D, Dolci P. Activity of natural occurring entomopathogenic fungi on nymphal and adult stages of Philaenus spumarius. J Invertebr Pathol 2024; 204:108078. [PMID: 38438078 DOI: 10.1016/j.jip.2024.108078] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2023] [Revised: 01/10/2024] [Accepted: 02/25/2024] [Indexed: 03/06/2024]
Abstract
The spittlebug Philaenus spumarius (Hemiptera: Aphrophoridae) is the predominant vector of Xylella fastidiosa (Xanthomonadales: Xanthomonadaceae) in Apulia, Italy and the rest of Europe. Current control strategies of the insect vector rely on mechanical management of nymphal stages and insecticide application against adult populations. Entomopathogenic fungi (EPF) are biological control agents naturally attacking spittlebugs and may effectively reduce population levels of host species. Different experimental trials in controlled conditions have been performed to i) identify naturally occurring EPF on P, spumarius in Northwestern Italy, and ii) evaluate the potential for biocontrol of the isolated strains on both nymphal and adult stages of the spittlebug. Four EPF species were isolated from dead P. spumarius collected in semi-field conditions: Beauveria bassiana, Conidiobolus coronatus, Fusarium equiseti and Lecanicillium aphanocladii. All the fungal isolates showed entomopathogenic potential against nymphal stages of P. spumarius (≈ 45 % mortality), except for F. equiseti, in preliminary trials. No induced mortality was observed on adult stage. Lecanicillium aphanocladii was the most promising fungus and its pathogenicity against spittlebug nymphs was further tested in different formulations (conidia vs blastospores) and with natural adjuvants. Blastospore formulation was the most effective in killing nymphal instars and reducing the emergence rate of P, spumarius adults, reaching mortality levels (90%) similar to those of the commercial product Naturalis®, while no or adverse effect of natural adjuvants was recorded. The encouraging results of this study pave way for testing EPF isolates against P, spumarius in field conditions and find new environmentally friendly control strategies against insect vectors of X. fastidiosa.
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Affiliation(s)
- Nicola Bodino
- Dipartimento di Scienze Agrarie, Forestali e Alimentari, Università Degli Studi di Torino, Largo Paolo Braccini, 2, 10095 Grugliasco, TO, Italy; CNR-Istituto Per La Protezione Sostenibile Delle Piante, Strada Delle Cacce, 73, 10135 Torino, Italy.
| | - Riccardo Barbera
- Dipartimento di Scienze Agrarie, Forestali e Alimentari, Università Degli Studi di Torino, Largo Paolo Braccini, 2, 10095 Grugliasco, TO, Italy.
| | - Natalia González-Mas
- Department of Agronomy, María de Maeztu Excellence Unit DAUCO, ETSIAM, University of Cordoba, C4 Building, Celestino Mutis, Campus de Rabanales, 14071, Cordoba, Spain.
| | - Stefano Demichelis
- Dipartimento di Scienze Agrarie, Forestali e Alimentari, Università Degli Studi di Torino, Largo Paolo Braccini, 2, 10095 Grugliasco, TO, Italy.
| | - Domenico Bosco
- Dipartimento di Scienze Agrarie, Forestali e Alimentari, Università Degli Studi di Torino, Largo Paolo Braccini, 2, 10095 Grugliasco, TO, Italy; CNR-Istituto Per La Protezione Sostenibile Delle Piante, Strada Delle Cacce, 73, 10135 Torino, Italy.
| | - Paola Dolci
- Dipartimento di Scienze Agrarie, Forestali e Alimentari, Università Degli Studi di Torino, Largo Paolo Braccini, 2, 10095 Grugliasco, TO, Italy.
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Zhang Z, Sui L, Tian Y, Lu Y, Xia X, Liu W, Cheng K, Li Q, Shi W. Metarhizium rileyi with broad-spectrum insecticidal ability confers resistance against phytopathogens and insect pests as a phytoendophyte. Pest Manag Sci 2024. [PMID: 38358040 DOI: 10.1002/ps.8027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2023] [Revised: 01/19/2024] [Accepted: 02/15/2024] [Indexed: 02/16/2024]
Abstract
BACKGROUND Entomophagous fungi (EPF) not only directly kill insect pests, but also colonize plants and improve their resistance against pests. However, most previous research has focused on Beauveria bassiana and Metarhizium anisopliae, and there are few reports on whether other EPF can enhance resistance against pests via endogenous colonization. Herein, an EPF strain was isolated from diseased larvae of Spodoptera litura in a soybean field, and subjected to genome-wide sequencing at the chromosomal level. The pathogenicity of the isolate toward various pest insects was evaluated, and the ability to colonize plants and induce resistance against phytopathogens and insect pests was tested. RESULTS The purified isolate was identified as M. rileyi and designated MrS1Gz1-1. Biological assays revealed its strong pathogenicity toward five insect pests belonging to Lepidoptera and Hemiptera. Furthermore, the strain inhibited the growth of soil-borne plant disease caused by Sclerotinia sclerotiorum in vitro. It colonized plants as an endophyte via soil application, thereby inducing plant resistance-related genes against phytopathogen infection, and it disrupted the feeding selectivity of S. litura larvae. CONCLUSION M. rileyi MrS1Gz1-1 has potential as a broad-spectrum microbial control agent that can induce resistance against phytopathogens and insect pests feeding as an endotype. The complete genome provides a valuable resource for exploring host interactions. © 2024 Society of Chemical Industry.
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Affiliation(s)
- Zhengkun Zhang
- Institute of Plant Protection, Jilin Academy of Agricultural Sciences, Jilin Key Laboratory of Agricultural Microbiology, Key Laboratory of Integrated Pest Management on Crops in Northeast China, Ministry of Agriculture and Rural Areas, Changchun, China
| | - Li Sui
- Institute of Plant Protection, Jilin Academy of Agricultural Sciences, Jilin Key Laboratory of Agricultural Microbiology, Key Laboratory of Integrated Pest Management on Crops in Northeast China, Ministry of Agriculture and Rural Areas, Changchun, China
| | - Yifan Tian
- Institute of Plant Protection, Jilin Academy of Agricultural Sciences, Jilin Key Laboratory of Agricultural Microbiology, Key Laboratory of Integrated Pest Management on Crops in Northeast China, Ministry of Agriculture and Rural Areas, Changchun, China
- Department of Entomology, College of Plant Protection, China Agricultural University, Beijing, China
| | - Yang Lu
- Institute of Plant Protection, Jilin Academy of Agricultural Sciences, Jilin Key Laboratory of Agricultural Microbiology, Key Laboratory of Integrated Pest Management on Crops in Northeast China, Ministry of Agriculture and Rural Areas, Changchun, China
| | - Xinyao Xia
- Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Wende Liu
- Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Ke Cheng
- Institute of Plant Protection, Jilin Academy of Agricultural Sciences, Jilin Key Laboratory of Agricultural Microbiology, Key Laboratory of Integrated Pest Management on Crops in Northeast China, Ministry of Agriculture and Rural Areas, Changchun, China
| | - Qiyun Li
- Institute of Plant Protection, Jilin Academy of Agricultural Sciences, Jilin Key Laboratory of Agricultural Microbiology, Key Laboratory of Integrated Pest Management on Crops in Northeast China, Ministry of Agriculture and Rural Areas, Changchun, China
- Department of Entomology, College of Plant Protection, China Agricultural University, Beijing, China
- Jilin Agricultural Science and Technology University, Jilin, P. R. China
| | - Wangpeng Shi
- Department of Entomology, College of Plant Protection, China Agricultural University, Beijing, China
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Tang X, Jeewon R, Lu YZ, Alrefaei AF, Jayawardena RS, Xu RJ, Ma J, Chen XM, Kang JC. Morphophylogenetic evidence reveals four new fungal species within Tetraplosphaeriaceae (Pleosporales, Ascomycota) from tropical and subtropical forest in China. MycoKeys 2023; 100:171-204. [PMID: 38098977 PMCID: PMC10719940 DOI: 10.3897/mycokeys.100.113141] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2023] [Accepted: 11/09/2023] [Indexed: 12/17/2023] Open
Abstract
Tetraplosphaeriaceae (Pleosporales, Ascomycota) is a family with many saprobes recorded from various hosts, especially bamboo and grasses. During a taxonomic investigation of microfungi in tropical and subtropical forest regions of Guizhou, Hainan and Yunnan provinces, China, several plant samples were collected and examined for fungi. Four newly discovered species are described based on morphology and evolutionary relationships with their allies inferred from phylogenetic analyses derived from a combined dataset of LSU, ITS, SSU, and tub2 DNA sequence data. Detailed illustrations, descriptions and taxonomic notes are provided for each species. The four new species of Tetraplosphaeriaceae reported herein are Polyplosphaeriaguizhouensis, Polyplosphaeriahainanensis, Pseudotetraploayunnanensis, and Tetraploahainanensis. A checklist of Tetraplosphaeriaceae species with available details on their ecology is also provided.
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Affiliation(s)
- Xia Tang
- Engineering and Research Center for Southwest Biopharmaceutical Resource of National Education Ministry of China, Guizhou University, Guiyang, 550025, Guizhou Province, China
- Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai, 57100, Thailand
| | - Rajesh Jeewon
- School of Science, Mae Fah Luang University, Chiang Rai, 57100, Thailand
- Department of Health Sciences, Faculty of Medicine and Health Sciences, University of Mauritius, Reduit, Mauritius
| | - Yong-Zhong Lu
- Engineering and Research Center for Southwest Biopharmaceutical Resource of National Education Ministry of China, Guizhou University, Guiyang, 550025, Guizhou Province, China
- Department of Zoology, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
| | - Abdulwahed Fahad Alrefaei
- Department of Health Sciences, Faculty of Medicine and Health Sciences, University of Mauritius, Reduit, Mauritius
| | | | - Rong-Ju Xu
- Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai, 57100, Thailand
| | - Jian Ma
- Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai, 57100, Thailand
| | - Xue-Mei Chen
- School of Food and Pharmaceutical Engineering, Guizhou Institute of Technology, Guiyang, Guizhou Province550003, China
| | - Ji-Chuan Kang
- Engineering and Research Center for Southwest Biopharmaceutical Resource of National Education Ministry of China, Guizhou University, Guiyang, 550025, Guizhou Province, China
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Zhou YM, Xie W, Zhi JR, Zou X. Frankliniella occidentalis pathogenic fungus Lecanicillium interacts with internal microbes and produces sublethal effects. Pestic Biochem Physiol 2023; 197:105679. [PMID: 38072536 DOI: 10.1016/j.pestbp.2023.105679] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2023] [Revised: 10/21/2023] [Accepted: 10/25/2023] [Indexed: 12/18/2023]
Abstract
Frankliniella occidentalis (Thysanoptera: Thripidae) is a pest that feeds on various crops worldwide. A prior study identified Lecanicillium attenuatum and L. cauligalbarum as pathogens of F. occidentalis. Unfortunately, the potential of these two entomopathogenic fungi for the biocontrol of F. occidentalis has not been effectively evaluated. The internal microbes (endosymbionts and the gut microbiota) of insects, especially gut bacteria, are crucial in regulating the interactions between the host and intestinal pathogens. The role of thrips internal microbes in the infection of these two entomopathogenic fungi is also unknown. Therefore, biological control of thrips is immediately needed, and to accomplish that, an improved understanding of the internal microbes of thrips against Lecanicillium infection is essential. The virulence of the two pathogenic fungi against F. occidentalis increased with the conidia concentration. Overall, the LC50 of L. cauligalbarum was lower than that of L. attenuatum, and the pathogenicity degree was adult > pupa > nymphs. The activities of protective enzymes include superoxide dismutase (SOD), catalase (CAT), peroxidase (POD); detoxification enzymes include polyphenol oxidase (PPO), glutathione s-transferase (GSTs), and carboxylesterase (CarE); hormones include ecdysone and juvenile hormone; and the composition and proportion of microorganisms (fungi and bacteria) in F. occidentalis infected by L. cauligalbarum and L. attenuatum have changed significantly. According to the network correlation results, there was a considerable correlation among the internal microbes (including bacteria and fungi), enzyme activities, and hormones, which indicates that in addition to bacteria, internal fungi of F. occidentalis are also involved in the L. cauligalbarum and L. attenuatum infection process. In addition, the development time of the surviving F. occidentalis exposed to L. cauligalbarum or L. attenuatum was significantly shorter than that of the control group. Furthermore, the intrinsic rate of increase (rm), finite rate of increase (λ), net reproductive rate (R0), mean generation time (T), and gross reproductive rate (GRR) were significantly lower in the treatment groups than in the control group. L. attenuatum and L. cauligalbarum have biocontrol potential against F. occidentalis. In addition to bacteria, internal fungi of F. occidentalis are also involved in the infection process of insect pathogenic fungi. Disruption of the internal microbial balance results in discernible sublethal effects. Such prevention and control potential should not be ignored. These findings provide an improved understanding of physiological responses in thrips with altered immunity against entomopathogenic fungal infections, which can guide us toward the development of novel biocontrol strategies against thrips.
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Affiliation(s)
- Ye-Ming Zhou
- Institute of Entomology, Guizhou University, The Provincial Key Laboratory for Agricultural Pest Management of the Mountainous Region, Guiyang 550025, Guizhou, China; Institute of Fungus Resources, Key laboratory of Plant Resource Conservation and Germplasm Innovation in Mountainous Region (Ministry of Education), College of life Sciences, Guizhou University, Guiyang 550025, Guizhou, China
| | - Wen Xie
- Institute of Entomology, Guizhou University, The Provincial Key Laboratory for Agricultural Pest Management of the Mountainous Region, Guiyang 550025, Guizhou, China
| | - Jun-Rui Zhi
- Institute of Entomology, Guizhou University, The Provincial Key Laboratory for Agricultural Pest Management of the Mountainous Region, Guiyang 550025, Guizhou, China.
| | - Xiao Zou
- Institute of Fungus Resources, Key laboratory of Plant Resource Conservation and Germplasm Innovation in Mountainous Region (Ministry of Education), College of life Sciences, Guizhou University, Guiyang 550025, Guizhou, China
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Shang Z, Wang Y, An M, Chen X, Kulyar MFEA, Tan Z, Liu S, Li K. The successional trajectory of bacterial and fungal communities in soil are fabricated by yaks’ excrement contamination in plateau, China. Front Microbiol 2022; 13:1016852. [DOI: 10.3389/fmicb.2022.1016852] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2022] [Accepted: 10/31/2022] [Indexed: 11/19/2022] Open
Abstract
The soil microbiome is crucial in determining contemporary realistic conditions for future terrestrial ecological and evolutionary development. However, the precise mechanism between the fecal deposition in livestock grazing and changes in the soil microbiome remains unknown. This is the first in-depth study of bacterial and fungal taxonomic changes of excrement contaminated soils in the plateau (>3,500 m). This suggests the functional shifts towards a harmful-dominated soil microbiome. According to our findings, excrement contamination significantly reduced the soil bacterial and fungal diversity and richness. Furthermore, a continuous decrease in the relative abundance of microorganisms was associated with nutrient cycling, soil pollution purification, and root-soil stability with the increasing degree of excrement contamination. In comparison, soil pathogens were found to have the opposite trend in the scenario, further deteriorating normal soil function and system resilience. Such colonization and succession of the microbiome might provide an important potential theoretical instruction for microbiome-based soil health protection measures in the plateau of China.
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Meng Y, Wellabada Hewage Don PID, Wang D. A New Strain of Lecanicillium uredinophilum Isolated from Tibetan Plateau and Its Insecticidal Activity. Microorganisms 2022; 10:1832. [PMID: 36144439 PMCID: PMC9501334 DOI: 10.3390/microorganisms10091832] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2022] [Revised: 09/04/2022] [Accepted: 09/07/2022] [Indexed: 11/22/2022] Open
Abstract
A new strain QHLA of Lecanicillium uredinophilum was isolated from a Chinese caterpillar fungus complex and its optimum growth temperature and fermentation conditions were studied. Its insecticidal activity was tested against larvae of seven different insect pests, including Henosepilachna vigintioctopunctata, Spodoptera exigua, Plutella xylostella, Spodoptera frugiperda, Sitobion avenae, Hyalopterus perikonus, and Aphis citricola. The optimum growth temperature was 21–24 °C. The highest spore production of the strain QHLA was 4.08 × 106 spore/mL on solid medium with a nitrogen source of NH4Cl. However, the highest mycelial growth rate of the strain QHLA was on solid medium with a nitrogen source from yeast extract (4.63 ± 0.03 mm/d). When the liquid medium contained peptone, yeast extract, and glucose, the water content of the mycelia was the lowest, while the spore production was the highest until day 12. When the liquid medium contained glucose, tussah pupa powder, KH2PO4, and MgSO4, the mycelia production was highest until day 8. The bioassay for insecticidal activity indicated that the LC50 values of QHLA were 6.32 × 103 spore/mL and 6.35 × 103 spore/mL against Sitobion avenae and Aphis citricola, respectively, while the LC90 values of the strain QHLA against Aphis citricola and Sitobion avenae were 2.11 × 107 spore/mL and 2.36 × 108 spore/mL, respectively. Our results demonstrated that the strain QHLA was a high virulence pathogenic fungus against insect pests, with the potential to be developed as a microbial pesticide.
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Wang X, Ding X, Fu K, Guo W, Zhan F, Yuan Z, Jia Z, Zhou L, Jiang X, Ghenijan O, Li Z, Dai J, Xie Y, Wang Z, Xinping Y. Molecular Identification and Efficacy of Entomopathogenic Fungi Isolates Against Larvae of the Asian Corn Borer
Ostrinia furnacalis
(Lepidoptera: Crambidae) in Xinjiang, China. J Appl Microbiol 2022; 133:2979-2992. [DOI: 10.1111/jam.15749] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Revised: 07/14/2022] [Accepted: 07/27/2022] [Indexed: 11/28/2022]
Affiliation(s)
- Xiaowu Wang
- Institute of Microbiology Applications, Xinjiang Academy of Agricultural Sciences PR China
- Key Laboratory of Integrated Pest Management on Crops in Northwestern Oasis Ministry of Agriculture Ürümqi PR China
| | - Xinhua Ding
- Key Laboratory of Integrated Pest Management on Crops in Northwestern Oasis Ministry of Agriculture Ürümqi PR China
- Institute of Plant Protection, Xinjiang Academy of Agricultural Sciences Ürümqi PR China
| | - Kaiyun Fu
- Key Laboratory of Integrated Pest Management on Crops in Northwestern Oasis Ministry of Agriculture Ürümqi PR China
- Institute of Plant Protection, Xinjiang Academy of Agricultural Sciences Ürümqi PR China
| | - Wenchao Guo
- Key Laboratory of Integrated Pest Management on Crops in Northwestern Oasis Ministry of Agriculture Ürümqi PR China
- Institute of Plant Protection, Xinjiang Academy of Agricultural Sciences Ürümqi PR China
| | - Faqiang Zhan
- Institute of Microbiology Applications, Xinjiang Academy of Agricultural Sciences PR China
| | - Zihan Yuan
- College of Agriculture Xinjiang Agricultural University Ürümqi PR China
| | - Zunzun Jia
- Key Laboratory of Integrated Pest Management on Crops in Northwestern Oasis Ministry of Agriculture Ürümqi PR China
- Institute of Plant Protection, Xinjiang Academy of Agricultural Sciences Ürümqi PR China
| | - Liuyan Zhou
- Institute of Microbiology Applications, Xinjiang Academy of Agricultural Sciences PR China
| | - Xudong Jiang
- College of Agriculture Xinjiang Agricultural University Ürümqi PR China
| | - Osman Ghenijan
- Institute of Microbiology Applications, Xinjiang Academy of Agricultural Sciences PR China
| | - Zhi Li
- Institute of Agricultural Economics and Technology Information, Xinjiang Academy of Agricultural Sciences Ürümqi PR China
| | - Jinping Dai
- Institute of Microbiology Applications, Xinjiang Academy of Agricultural Sciences PR China
| | - Yuqing Xie
- Institute of Microbiology Applications, Xinjiang Academy of Agricultural Sciences PR China
| | - Zhifang Wang
- Institute of Microbiology Applications, Xinjiang Academy of Agricultural Sciences PR China
| | - Yang Xinping
- Institute of Microbiology Applications, Xinjiang Academy of Agricultural Sciences PR China
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Zuo Y, Yu F, Zhang J, Xia C, Zhang H, Deng H, Gralnick JA. Contrasting Responses of Rhizosphere Fungi of Scutellaria tsinyunensis , an Endangered Plant in Southwestern China. Microbiol Spectr. [PMID: 35863021 PMCID: PMC9430849 DOI: 10.1128/spectrum.00225-22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Scutellaria tsinyunensis is an endangered species in southwest China, distributed sporadically in mountainous areas at an elevation of approximately 200 to 900 m. Rhizosphere soil properties and fungal communities play critical roles in plant survival and expansion. Nevertheless, understanding of soil properties and fungal communities in the S. tsinyunensis distribution areas is extremely limited. The present study examined soil properties and fungal communities in nearly all extant S. tsinyunensis populations at two altitudinal gradients (low and high groups). Our findings indicated that soil characteristics (i.e., soil pH, water content, and available phosphorus) were affected distinctively by altitudes (P < 0.05). In addition, the low altitude group harbored higher fungal richness and diversity than the high altitude. Co-occurrence network analysis identified six key genera that proved densely connected interactions with many genera. Further analysis represented that the low altitude group harbored three beneficial genera belonging to Ascomycota (Archaeorhizomyces, Dactylella, and Helotiales), whereas the high altitude showed more pathogenic fungi (Apiosporaceae, Colletotrichum, and Fusarium). Correlation analysis found that soil water content was highly correlated with Hydnodontaceae and Lophiostoma. Besides, plants’ canopy density was negatively correlated with four pathogenic fungi, indicating that the high abundance of the pathogen at high altitudes probably inhibited the survival of S. tsinyunensis. To sum up, this comprehensive analysis generates novel insights to explore the contrasting responses of S. tsinyunensis rhizosphere fungal communities and provides profound references for S. tsinyunensis habitat restoration and species conservation. IMPORTANCE Our study highlighted the importance of rhizosphere fungal communities in an endangered plant, S. tsinyunensis. Comparative analysis of soil samples in nearly all extant S. tsinyunensis populations identified that soil properties, especially soil water content, might play essential roles in the survival and expansion of S. tsinyunensis. Our findings proved that a series of fungal communities (e.g., Archaeorhizomyces, Dactylella, and Helotiales) could be essential indicators for S. tsinyunensis habitat restoration and protection for the first time. In addition, further functional and correlation analyses revealed that pathogenic fungi might limit the plant expansion into high altitudes. Collectively, our findings displayed a holistic picture of the rhizosphere microbiome and environmental factors associated with S. tsinyunensis.
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Zhou YM, Zhi JR, Qu JJ, Zou X. Estimated Divergence Times of Lecanicillium in the Family Cordycipitaceae Provide Insights Into the Attribution of Lecanicillium. Front Microbiol 2022; 13:859886. [PMID: 35602068 PMCID: PMC9121009 DOI: 10.3389/fmicb.2022.859886] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2022] [Accepted: 03/29/2022] [Indexed: 11/18/2022] Open
Abstract
Background The genus Lecanicillium W.Gams & Zare is a recognized insect pathogen but members of the genus have been found parasitizing various hosts including arthropods, nematodes, plants, and fungi. The new classification system for fungi proposed to reject Lecanicillium and transfer some of the species to the genus Akanthomyces. However, the attribution problem of most species in the original genus Lecanicillium remains unsolved. The current study aimed to improve understanding of the pivotal internal phylogeny in Lecanicillium by estimating the divergence times of Lecanicillium to provide additional insights into the status of this genus within the family Cordycipitaceae. Results Dating analyses support the supposition that the ancestor of Lecanicillium was in the Cretaceous period (84.36 Mya, 95% HPD: 72.12–94.74 Mya). After originating from a common ancestor, eight clades of Lecanicillium were derived and evolved independently in parallel with other genera of Cordycipitaceae. Based on the clear divergence age estimates, Lecanicillium clade 8 originated earlier as an independent group in the Cretaceous period (75.61 Mya, 95% HPD: 63.31–87.54 Mya), while Lecanicillium clades 1–7 originated later as an independent group in the boundary of the Cretaceous and Paleogene periods (64.66 Mya, 95% HPD: 52.75–76.74 Mya). Lecanicillium huhutii formed an independent branch in a polytomy together with a clade containing Lecanicillium tenuipes (BI posterior probabilities 1, ML bootstrap 100%). Conclusion The pivotal internal phylogeny, origin, and evolutionary history of Lecanicillium in the family Cordycipitaceae were investigated. Phylogenetic and morphological analyses indicated that there are eight representative clades (four representative branches of evolutionary history), including clade 1 (members have a relatively uniform sporulation structure comprising globose heads with a higher number of conidia), clade 8 (including all members of Gamszarea), clades 2–5 (the differences of the divergence time estimations were smaller compared with other clades), and clade 6–7 (members are close to Gibellula, Hevansia, and Ascopolyporus). Based on the above findings, a novel spider-pathogenic fungus, Lecanicillium huhutii, is described. All other species in Lecanicillium clade 1 (Lecanicillium araneogemum, L. nodulosum, L. pissodis, and L. uredinophilum) should be transferred to the genus Akanthomyces. Furthermore, the monotypic genus Parengyodontium should be merged with the genus Gamszarea. More novel species need to be discovered to thoroughly resolve the attribution problem of Lecanicillium. Finally, no major lineages of Lecanicillium were correlated with the nearby Cretaceous-Tertiary extinction event, indicating that the diversity of Lecanicillium is more likely to be caused by long-term environmental adaptation and coevolution with insects rather than by dramatic extinction events.
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Affiliation(s)
- Ye-Ming Zhou
- Institute of Entomology, Guizhou University, Guiyang, China
- Institute of Fungus Resources, Guizhou University, Guiyang, China
| | - Jun-Rui Zhi
- Institute of Entomology, Guizhou University, Guiyang, China
| | - Jiao-Jiao Qu
- College of Tea Sciences, Guizhou University, Guiyang, China
| | - Xiao Zou
- Institute of Fungus Resources, Guizhou University, Guiyang, China
- *Correspondence: Xiao Zou,
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Abstract
Morel mushroom (Morchella spp.) is a rare edible fungus with high nutritional and medicinal value. In China they are cultivated in sandy soils in greenhouses and production of fresh mushrooms reached 10,000 tons in 2019. However, from 2019 to 2020, a serious rot disease with 30% natural incidence was observed on M. sextelata at a mushroom farm in Pinghu (N30°39', E121°2'), Zhejiang province of China. The symptoms mainly occurred after the first flush in the early February. First, a small white mold-like symptoms appeared on the surface or the pinnacle of pileus. Then the lesion developed to encircle the pileus and spread gradually to the stipe. The lesions expanded rapidly at high temperature (>20 °C) and humidity (>70%). In the final stages of infection, the fruiting bodies became soft with white molds. The pathogen was isolated from the margin of the lesions by plating onto potato dextrose agar (PDA) and incubated at 25 °C in the dark. Colonies on PDA grew fast, reaching 60 mm in 7 days at 25 °C, and were white to cream in color, while the back of colonies appeared red to brick-red gradually. Conidiogenous cell was solitary or in whorls of 2-4, flask-shaped in the beginning, and tapered into a thread-like neck. Conidia were borne at the tips of conidiogenous cells, were oval to sub-globose, and ranged from 1.2-2.0 µm in width and 3.2-4.3 µm in length. All these characteristics were consistent with those of Lecanicillium aphanocladii (Zare R and Gams W. 2001). To confirm the identity of the pathogen (L. aphanocladii strain G1), the genomic fragments for the internal transcribed spacer (ITS) and RNA polymerase II second largest subunit (RPB2) gene of the isolate were amplified by PCR (White et al. 1990; Zhou et al. 2020). The resulting sequence was deposited in GenBank with accession No. OL629617 and No. ON005041, respectively. BLAST results showed >99% identity with those of L. aphanocladii (MG593981.1 and KM283853.1, respectively). Concatenated sequences of the two genes in L. aphanocladii strain G1 were used to conduct a phylogenetic analysis using Bayesian inference (BI) and maxium likelihood (ML) methods in MEGA6 (Tamura et al. 2013). The pathogen was grown in PDB medium at 25 °C, 200 r/min for 14 days, and after which conidial suspension (1×107conidia/mL) was prepared by filtration with four layers of sterile gauze. A pathogenicity test was performed by spraying on ten fruit bodies of M. sextelata and cultured in 20 °C and 90 to 95% relative humidity for 7 days. The test results showed that the pathogen infected the pileus and developed into white mold-like lesion, gradually spread to the stipe, and eventually the whole fruiting body became soft with white molds. The pathogen was re-isolated from infected fruiting bodies and was confirmed to be L. aphanocladii, based on morphological characteristics and the ITS, RPB2 sequence. Meanwhile,the control M. sextelata was sprayed with PDB medium and grew normally without any symptoms. L. aphanocladii has been reported on cultivated fungi such as Agaricus bisporus and A. bitorquis in Europe (Zare & Gams 2001) as well as more recently on Tremella fuciformis in China (Liu et al 2018). To our knowledge, this is the first report of L. aphanocladii causing rot of M. sextelata. According to the disease observation in the farm of Pinghu, this rot disease breaks out and spreads fast, and is getting worse ever year, resulting in a huge loss of yield and commodity value. It is a big concern to producers of this edible fungus.
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Affiliation(s)
- Beibei Lv
- Shanghai Academy of Agricultural Sciences, 74594, Biotechnology Research Institute, Shanghai, China;
| | - Yu Sun
- Shanghai Academy of Agricultural Sciences, 74594, Biotechnology Research Institute, Shanghai, China;
| | - Yifan Chen
- Shanghai Academy of Agricultural Sciences, 74594, Biotechnology Research Institute, Shanghai, China;
| | - Hailong Yu
- Shanghai Academy of Agricultural Sciences, 74594, Institute of Edible Fungi, Shanghai, China;
| | - Qin Mo
- Shanghai Academy of Agricultural Sciences, 74594, Biotechnology Research Institute, Beidi Road No.2901, Shanghai, China, 201106;
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