scholarly journals Relationship of Resistance-Related Enzyme activity and Salicylic Acid content in Phalaenopsis Species with different levels of resistance to DIckeya Dadantii

2022 ◽  
Vol 0 (0) ◽  
Author(s):  
I Putu Wahyu SANJAYA ◽  
Dewi SUKMA ◽  
Sudarsono SUDARSONO ◽  
Ming-Tsair CHAN
Keyword(s):  
Salicylic Acid ◽  
Lignin Content ◽  
Soft Rot ◽  
Disease Assessment ◽  
Post Inoculation ◽  
Necrotrophic Pathogen ◽  
Dickeya Dadantii ◽  
Soft Rot Disease ◽  
Resistant Species ◽  
Rot Disease

ABSTRACT Orchids (Phalaenopsis) are ornamental plants that are cultivated commercially and in great demand in the market. Soft-rot disease (SRD) caused by the necrotrophic pathogen Dickeya dadantii is a cause of considerable economic loss to cultivators of many orchid species. Our previous experiment identified a limited number of species that were resistant to D. dadantii. This study aimed to validate the resistance level of four Phalaenopsis species in a detached leaf inoculation protocol to identify the resistance mechanism(s) involved. Soft-rot symptom diameter was measured from 6 to 18 hours post-inoculation (HPI) with D. dadantii. Disease assessment confirmed that P. amboinensis is a resistant species, P. pantherina is a susceptible species, and P. amabilis and P. schilleriana are very susceptible species. There was no difference in the lignin content between the resistant and very susceptible species. Detailed observation of resistant and very susceptible species, P. amboinensis vs. P. amabilis, revealed higher phenylalanine ammonia-lyase (PAL) and peroxidase (POD) in P. amabilis than in P. amboinensis. In contrast, there was higher salicylic acid (SA) content in P. amboinensis than in P. amabilis. These results suggest that POD and PAL activities may not be effective in defense against soft-rot disease, while SA plays an important role in the resistance of P. amboinensis to D. dadantii. Low PAL activity in P. amboinensis implies that the SA contents from the isochorismate pathway may be involved in the mechanism of P. amboinensis resistance to D. dadantii. Therefore, endogenous SA content may be a good indicator for screening resistant species in Phalaenopsis.

scholarly journals Identification of bacterial virulence factors based on an integration of experimental and in silico transcription factor target discovery

2020 ◽  
Author(s):  
P. V. Vychyk ◽  
Y. A. Nikolaichik
Keyword(s):  
Transcription Factor ◽  
Transcription Factors ◽  
Binding Sites ◽  
In Silico ◽  
Soft Rot ◽  
Bacterial Virulence ◽  
Dickeya Dadantii ◽  
Soft Rot Disease ◽  
Transcription Factor Target ◽  
Rot Disease

In silico transcription factors binding sites analysis in Dickeya dadantii genome matches published experimental results and predicts new regulators for genes inducing soft-rot disease in plants.

scholarly journals First Report of Soft Rot Disease on Pak Choi (Brassica chinensis) Caused by Dickeya dadantii subsp. dieffenbachiae in Malaysia

Plant Disease ◽  
2016 ◽  
Vol 100 (1) ◽  
pp. 209-209 ◽  
Author(s):  
E. Golkhandan ◽  
S. Kamaruzaman ◽  
M. A. Zainalabidin ◽  
A. Nasehi
Keyword(s):  
Soft Rot ◽  
Dickeya Dadantii ◽  
Pak Choi ◽  
Brassica Chinensis ◽  
First Report ◽  
Soft Rot Disease ◽  
Rot Disease

scholarly journals The Virulence of a Dickeya dadantii 3937 Mutant Devoid of Osmoregulated Periplasmic Glucans Is Restored by Inactivation of the RcsCD-RcsB Phosphorelay

2010 ◽  
Vol 192 (13) ◽  
pp. 3484-3490 ◽  
Author(s):  
Franck Bouchart ◽  
Gilles Boussemart ◽  
Anne-France Prouvost ◽  
Virginie Cogez ◽  
Edwige Madec ◽  
...  
Keyword(s):  
Plant Species ◽  
Soft Rot ◽  
Dickeya Dadantii ◽  
Soft Rot Disease ◽  
Low Level ◽  
Pleiotropic Phenotype ◽  
Wide Range ◽  
Induced Mutagenesis ◽  
Rot Disease ◽  
High Level

ABSTRACT Dickeya dadantii is a pectinolytic phytopathogen enterobacterium that causes soft rot disease on a wide range of plant species. The virulence of D. dadantii involves several factors, including the osmoregulated periplasmic glucans (OPGs) that are general constituents of the envelope of proteobacteria. In addition to the loss of virulence, opg-negative mutants display a pleiotropic phenotype, including decreased motility and increased exopolysaccharide synthesis. A nitrosoguanidine-induced mutagenesis was performed on the opgG strain, and restoration of motility was used as a screen. The phenotype of the opg mutant echoes that of the Rcs system: high level activation of the RcsCD-RcsB phosphorelay is needed to activate exopolysaccharide synthesis and to repress motility, while low level activation is required for virulence in enterobacteria. Here, we show that mutations in the RcsCDB phosphorelay system restored virulence and motility in a D. dadantii opg-negative strain, indicating a relationship between the Rcs phosphorelay and OPGs.

scholarly journals Kemampuan Bakteri Endofit Akar dan Ubi Kentang untuk Menekan Penyakit Busuk Lunak (Erwinia carotovora pv. carotovora) pada Ubi

Agrikultura ◽  
2016 ◽  
Vol 27 (3) ◽  
Author(s):  
Noor Istifadah ◽  
Muhamad Salman Umar ◽  
Sudarjat Sudarjat ◽  
Luciana Djaya
Keyword(s):  
Biological Control ◽  
Potato Tuber ◽  
Endophytic Bacteria ◽  
Erwinia Carotovora ◽  
Soft Rot ◽  
Soft Rot Disease ◽  
Post Harvest ◽  
Rot Disease

ABSTRACTThe abilities of endophytic bacteria from potato roots and tubers to suppress soft rot disease (Erwinia carotovora pv. carotovora) in potato tuberSoft rot disease caused by Erwinia carotovora pv. carotovora is one of limiting factors in cultivation and post harvest of potato. The eco-friendly control measure that can be developed for controlling the diseases is biological control. Microbes that are potential as biological control agents include endophytic bacteria. This paper discussed the results of study examining the potential of endophytic bacteria isolated from roots and tubers of potato to inhibit the growth of E. carotovora pv. carotovora in vitro and suppress soft rot disease in potato tuber. The results showed that among 24 isolates examined, four isolates of endophytic bacteria (one isolate from potato tuber and three isolates from potato roots) inhibited the growth of E. carotovora pv. carotovora in vitro with inhibition zone 3.5-6.8 mm. In the in vivo test, the isolates inhibited the soft rot disease in potato tuber by 71.5-86.4%. The isolate that tended to show relatively better inhibition in vitro and in vivo was isolate from potato tuber which is CK U3 (Lysinibacillus sp.)Keywords: Biological control, Endophytic bacteria, Post-harvest, Potato, Soft rot diseaseABSTRAKPenyakit busuk lunak yang disebabkan bakteri Erwinia carotovora pv. carotovora, merupakan salah satu kendala dalam budidaya dan pascapanen kentang. Cara pengendalian ramah lingkungan yang dapat dikembangkan untuk menekan penyakit tersebut adalah pengendalian biologi. Kelompok mikroba yang berpotensi sebagi agens pengendali biologi adalah bakteri endofit. Artikel ini mendiskusikan potensi isolat bakteri endofit yang berasal dari ubi dan akar kentang untuk menghambat pertumbuhan bakteri E. carotovora pv. carotovora secara in vitro dan menekan perkembangan penyakit busuk lunak pada ubi kentang. Hasil percobaan menunjukkan bahwa diantara 24 isolat bakteri yang diuji, terdapat empat isolat bakteri endofit (satu isolat dari ubi kentang dan tiga isolat dari akar kentang) yang dapat menghambat pertumbuhan bakteri E. carotovora pv. carotovora secara in vitro dengan zona penghambatan sebesar 3,5-6,8 mm. Pada pengujian secara in vivo, isolat-isolat tersebut dapat menekan perkembangan penyakit busuk lunak pada ubi kentang sebesar 71,5-86,4%. Isolat yang cenderung menunjukkan penghambatan relatif lebih baik secara in vitro dan in vivo adalah isolat bakteri endofit asal ubi kentang yaitu isolat CK U3 (Lysinibacillus sp.).Kata Kunci: Pengendalian biologi, Bakteri endofit, Pascapanen, Kentang, Penyakit busuk basah

scholarly journals Effects of Culture Conditions on the Antibacterial Activity of Streptomyces Spp. against Erwinia Spp. Causing Soft Rot Disease on Asparagus Officinalis

2021 ◽  
Vol 4 (2) ◽  
pp. 1077-1086
Author(s):  
Nguyen Thanh Trung ◽  
Nguyen Thi Van Anh ◽  
Tran Thi Dao ◽  
Nguyen Thanh Huyen ◽  
Pham Le Anh Minh ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Ornamental Plants ◽  
Soft Rot ◽  
Antibacterial Activities ◽  
Culture Conditions ◽  
Asparagus Officinalis ◽  
Effective Control ◽  
Soft Rot Disease ◽  
Streptomyces Spp ◽  
Rot Disease

Erwinia is a genus of Enterobacteriacea containing mostly pathogens, which cause soft rot disease in many ornamental plants and crops, including Asparagus officinalis. Chemical treatments to control Erwinia have lost their attractiveness because of the development of resistant strains and the negative impacts on the environment and human health. Therefore, the study of biological controls of soft rot disease has gained great importance. There are several types of microorganisms that show activity against Erwinia spp. such as Pseudomonas fluorescence, Bacillus subtilis, and Streptomyces spp. Among them, Streptomyces spp. are found to be the most effective control agents. In this study, 64 isolates of Streptomyces were screened for their antibacterial activity against Erwinia spp. The results indicated that 18 isolates showed an antagonistic reaction against Erwinia spp. Among them, isolate D5.1 showed the highest inhibition activity. In addition, the morphological and antibacterial activities of isolate D5.1 grown in different conditions were also characterized. 

Biological Control Efficacy of Bacillus Licheniformis Hg03 Against Soft Rot Disease of Postharvest Peach

2022 ◽  
Author(s):  
Yunpeng Wang ◽  
Xiaoli Wang ◽  
Jingfeng Zhu ◽  
Huan Wei ◽  
Zhipeng Ding ◽  
...  
Keyword(s):  
Biological Control ◽  
Bacillus Licheniformis ◽  
Soft Rot ◽  
Control Efficacy ◽  
Soft Rot Disease ◽  
Rot Disease

scholarly journals Complete Genome Sequence of Dickeya dianthicola ME23, a Pathogen Causing Blackleg and Soft Rot Diseases of Potato

2019 ◽  
Vol 8 (7) ◽  
Author(s):  
Xing Ma ◽  
Nicole T. Perna ◽  
Jeremy D. Glasner ◽  
Jianjun Hao ◽  
Steven Johnson ◽  
...  
Keyword(s):  
North America ◽  
Genome Sequence ◽  
Bacterial Population ◽  
Soft Rot ◽  
Potato Production ◽  
Disease Outbreak ◽  
Potato Blackleg ◽  
Content Type ◽  
Soft Rot Disease ◽  
Rot Disease

In 2014, an outbreak of potato blackleg and soft rot disease emerged in North America and continues to impact potato production. Here, we report the annotated genome sequence of Dickeya dianthicola ME23, a strain hypothesized to be representative of the bacterial population responsible for this disease outbreak.

scholarly journals Screening, Identification and Efficacy Evaluation of Antagonistic Bacteria for Biocontrol of Soft Rot Disease Caused by Dickeya zeae

2020 ◽  
Vol 8 (5) ◽  
pp. 697 ◽  
Author(s):  
Jieling Li ◽  
Ming Hu ◽  
Yang Xue ◽  
Xia Chen ◽  
Guangtao Lu ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Prevention And Control ◽  
Pathogenic Bacteria ◽  
Soft Rot ◽  
Antagonistic Bacteria ◽  
Bacterial Soft Rot ◽  
Soft Rot Disease ◽  
Wide Range ◽  
Rot Disease ◽  
And Control

Dickeya zeae is the causal agent of bacterial soft rot disease, with a wide range of hosts all over the world. At present, chemical agents, especially agricultural antibiotics, are commonly used in the prevention and control of bacterial soft rot, causing the emergence of resistant pathogens and therefore increasing the difficulty of disease prevention and control. This study aims to provide a safer and more effective biocontrol method for soft rot disease caused by D. zeae. The spot-on-lawn assay was used to screen antagonistic bacteria, and three strains including SC3, SC11 and 3-10 revealed strong antagonistic effects and were identified as Pseudomonas fluorescens, P. parafulva and Bacillus velezensis, respectively, using multi-locus sequence analysis (MLSA) based on the sequences of 16S rRNA and other housekeeping genes. In vitro antimicrobial activity showed that two Pseudomonas strains SC3 and SC11 were only antagonistic to some pathogenic bacteria, while strain 3-10 had broad-spectrum antimicrobial activity on both pathogenic bacteria and fungi. Evaluation of control efficacy in greenhouse trials showed that they all restrained the occurrence and development of soft rot disease caused by D. zeae MS2 or EC1. Among them, strain SC3 had the most impressive biocontrol efficacy on alleviating the soft rot symptoms on both monocotyledonous and dicotyledonous hosts, and strain 3-10 additionally reduced the occurrence of banana wilt disease caused by Fusarium oxysporum f. sp. cubensis. This is the first report of P. fluorescens, P. parafulva and B. velezensis as potential bio-reagents on controlling soft rot disease caused by D. zeae.

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