First Record of Alternaria pogostemonis: A Novel Species Causing Leaf Spots in Pogostemon cablin

Luo, Mei; Zhao, Minping; Huang, Yan; Liu, Jiawei; Qing-yun, Huang; Yong-Xin, Shu; Dong, Zhangyong

doi:10.3390/pathogens11101105

Cited by 3 publications

(2 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The dual culture technique was used to screen isolates with antagonistic activity against FocTR4 14,013 strain and other pathogens, such as Alternaria alternata, Calonectria ilicicola (Chen et al, 2022), Colletotrichum gloeosporioides, F. oxysporum from Morinda officinalis (Dong et al, 2019), Helminthosporium maydis, Lasiodiplodia pseudotheobromae (Chen et al, 2020), and Stagonosporopsis pogostemonis (Luo et al, 2022). All of the strains were cultured by PDA plates at 28°C.…”

Section: Screening Of Antagonistic Isolatesmentioning

confidence: 99%

Trichoderma koningiopsis Tk905: an efficient biocontrol, induced resistance agent against banana Fusarium wilt disease and a potential plant-growth-promoting fungus

Luo,

Chen,

Huang

et al. 2023

Front. Microbiol.

Self Cite

View full text Add to dashboard Cite

Fusarium oxysporum f. sp. cubense tropical race 4 (FocTR4) is a devastating phytopathogen responsible for significant losses in banana production worldwide. Trichoderma and other biocontrol agents (BCAs) have been used as suitable disease control methods for banana Fusarium wilt. In this study, the endophytic T. koningiopsis Tk905 strain was isolated from the roots of dendrobe plants and identified utilizing morphological and molecular analyses. Antifungal activity tests revealed that Tk905 effectively inhibited mycelial growth with inhibition rates ranging from 26.52 to 75.34%. Additionally, Tk905 covered the pathogen mycelia, and spores were observed on or around the pathogen hyphae. The average root and shoot fresh weights and plant height, of Tk905-inoculated plants were significantly higher than those of the untreated plants. Furthermore, Tk905 treatment significantly increased the activity of antioxidant enzymes, such as catalase (CAT), phenylalanine ammonia-lyase (PAL), polyphenol oxidase (PPO), and peroxidase (POD), suggesting that Tk905 may enhance plant defence systems by activating their antioxidant mechanisms. Most importantly, Tk905-treated plants inoculated by three methods exhibited significantly lower disease incidence and severity than untreated plants. The protective effects of Tk905 against FocTR4 infection were not only observed in the early stages of infection but persisted throughout the experiment, suggesting that T. koningiopsis Tk905 can provide long-lasting protection against Fusarium wilt.

show abstract

Section: Screening Of Antagonistic Isolatesmentioning

confidence: 99%

Trichoderma koningiopsis Tk905: an efficient biocontrol, induced resistance agent against banana Fusarium wilt disease and a potential plant-growth-promoting fungus

Luo,

Chen,

Huang

et al. 2023

Front. Microbiol.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Alternaria species are common, able to grow under a large range of temperatures [ 15 ], and associated with a variety of substrates such as animals, humans, plants, seeds, and soils [ 16 ]. Alternaria comprises nearly 300 species that occur worldwide [ 17 , 18 , 19 ] as either plant-pathogenic or saprotrophic organisms [ 20 ]. Some of these species have caused economic losses on many crops worldwide due to their ability to cause diseases that impact plant health or yield [ 21 ].…”

Section: Introductionmentioning

confidence: 99%

Multigene Phylogeny and Pathogenicity Trials Revealed Alternaria alternata as the Causal Agent of Black Spot Disease and Seedling Wilt of Pecan (Carya illinoinensis) in South Africa

et al. 2023

View full text Add to dashboard Cite

The pecan (Carya illinoinensis) industry in South Africa is growing rapidly, and it is becoming increasingly crucial to understand the risks posed to pecans by fungal pathogens. Black spots on leaves, shoots, and nuts in shucks caused by Alternaria species have been observed since 2014 in the Hartswater region of the Northern Cape Province of South Africa. Species of Alternaria include some of the most ubiquitous plant pathogens on earth. The aim of this study was to use molecular techniques to identify the causative agents of Alternaria black spot and seedling wilt isolated from major South African pecan-production areas. Symptomatic and non-symptomatic pecan plant organs (leaves, shoots, and nuts-in-shucks) were collected from pecan orchards, representing the six major production regions in South Africa. Thirty Alternaria isolates were retrieved from the sampled tissues using Potato Dextrose Agar (PDA) culture media and molecular identification was conducted. The phylogeny of multi-locus DNA sequences of Gapdh, Rpb2, Tef1, and Alt a 1 genes revealed that the isolates were all members of Alternaria alternata sensu stricto, forming part of the Alternaria alternata species complex. The virulence of six A. alternata isolates were tested on detached nuts of Wichita and Ukulinga cultivars, respectively, as well as detached leaves of Wichita. The A. alternata isolates were also evaluated for their ability to cause seedling wilt in Wichita. The results differed significantly between wounded and unwounded nuts of both cultivars, but not between the cultivars. Similarly, the disease lesions on the wounded detached leaves were significantly different in size from the unwounded leaves. The seedling tests confirmed that A. alternata is pathogenic and that A. alternata causes black spot disease and seedling wilt of pecans. This study is one of the first documentations of Alternaria black spot disease of pecan trees and its widespread occurrence in South Africa.

show abstract

Etiology of Foliar Blight of Indian Paintbrush (Castilleja tenuiflora) in Mexico

Solano-Báez,

Trejo-Tapia,

Kolařík

et al. 2024

Microorganisms

View full text Add to dashboard Cite

Castilleja tenuiflora is a native perennial plant used in traditional Mexican medicine. In June 2022, leaf blight symptoms were observed in a wild population of C. tenuiflora plants. Disease incidence was 80% and disease intensity reached up to 5% of the leaf area. Currently, there are no reports of pathogens causing leaf blight in this plant; therefore, this work aimed to identify the fungi responsible for the disease. The fungi recovered from the diseased tissue were characterized by means of pathogenicity tests and cultural, morphological, and molecular characterization. The information obtained revealed that Alternaria alternata and Alternaria gossypina are the pathogens responsible for the disease. This is the first report implicating species of Alternaria in causing leaf blight of C. tenuiflora in Mexico, as well as the first report of Alternaria gossypina also in Mexico. These pathogens may threaten the in situ conservation of native C. tenuiflora populations and limit their in vitro propagation. Future research lines should focus on determining the effect of these pathogens on metabolite production.

show abstract

First Record of Alternaria pogostemonis: A Novel Species Causing Leaf Spots in Pogostemon cablin

Cited by 3 publications

References 31 publications

Trichoderma koningiopsis Tk905: an efficient biocontrol, induced resistance agent against banana Fusarium wilt disease and a potential plant-growth-promoting fungus

Trichoderma koningiopsis Tk905: an efficient biocontrol, induced resistance agent against banana Fusarium wilt disease and a potential plant-growth-promoting fungus

Multigene Phylogeny and Pathogenicity Trials Revealed Alternaria alternata as the Causal Agent of Black Spot Disease and Seedling Wilt of Pecan (Carya illinoinensis) in South Africa

Etiology of Foliar Blight of Indian Paintbrush (Castilleja tenuiflora) in Mexico

Contact Info

Product

Resources

About