Burkholderia gladioli E39CS3, an endophyte of Crocus sativus Linn., induces host resistance against corm‐rot caused by Fusarium oxysporum

2021 ◽  
Author(s):  
Tanveer Ahmad ◽  
Abid Bashir ◽  
Sadaqat Farooq ◽  
Syed Riyaz‐Ul‐Hassan
Keyword(s):  
Fusarium Oxysporum ◽  
Host Resistance ◽  
Crocus Sativus ◽  
Burkholderia Gladioli

scholarly journals Role of Biocontrol Agents in Management of Corm Rot of Saffron Caused by Fusarium oxysporum

Agronomy ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1398
Author(s):  
Vishal Gupta ◽  
Krishna Kumar ◽  
Kausar Fatima ◽  
Vijay Kumar Razdan ◽  
Bhagwati Charan Sharma ◽  
...  
Keyword(s):  
Fusarium Oxysporum ◽  
Growth Promotion ◽  
Disease Incidence ◽  
Biocontrol Agents ◽  
Crocus Sativus ◽  
First Year ◽  
Dual Culture ◽  
Maximum Reduction

Saffron (Crocus sativus L.) is considered as one of the most expensive spices. Fusarium corm rot of saffron, caused by Fusarium oxysporum, is known to cause severe yield losses worldwide. In the present study, efficacy of biocontrol agents (Trichoderma asperellum, Pseudomonas fluorescens, Pseudomonas aeruginosa, Pseudomonas putida, Bacillus stratosphericus, Bacillus pumilus, and Bacillus subtilis) along with a chemical fungicide, carbendazim, was evaluated for managing the corm rot of saffron. Under in vitro conditions, using dual culture and poison food techniques on potato dextrose agar, T. asperellum and carbendazim significantly reduced the mycelial growth of the pathogen F. oxysporum, with the inhibition of 62.76 and 60.27%, respectively, compared with control. Under field conditions, dipping of saffron corms in carbendazim and T. asperellum exhibited maximum reduction of 82.77 and 77.84%, respectively, in the disease incidence, during the first year of experiment. However, during the second year, maximum reduction in the incidence of corm rot (68.63%) was recorded with the T. asperellum. Moreover, the population density of F. oxysporum was also significantly reduced by 60 and 80.19% while using T. asperellum after 75 and 260 days of sowing of saffron corms, compared to its population before planting of corms. In case of growth promotion traits, such as sprouting and flowering, biocontrol treatments reduced the number of days (average) of sprouting and flower emergence after sowing, compared to control.

scholarly journals Assessing Variations in Host Resistance to Fusarium oxysporum f sp. cubense Race 4 in Musa Species, With a Focus on the Subtropical Race 4

2019 ◽  
Vol 10 ◽  
Author(s):  
Andrew Chen ◽  
Jiaman Sun ◽  
Andrea Matthews ◽  
Liz Armas-Egas ◽  
Ning Chen ◽  
...  
Keyword(s):  
Fusarium Oxysporum ◽  
Host Resistance ◽  
Race 4 ◽  
Musa Species

scholarly journals Preliminary Characterization of Fusarium oxysporum f. sp. gladioli Causing Fusarium Corm Rot of Saffron in Italy

Plant Disease ◽  
2000 ◽  
Vol 84 (7) ◽  
pp. 806-806 ◽  
Author(s):  
P. Di Primo ◽  
C. Cappelli
Keyword(s):  
Fusarium Oxysporum ◽  
Central Italy ◽  
Vegetative Compatibility ◽  
Crocus Sativus ◽  
Basal Stem Rot ◽  
Vegetative Compatibility Groups ◽  
Nit Mutants ◽  
Rapid Spread ◽  
Plant Pathol

Fusarium corm rot of saffron (Crocus sativus L.), incited by Fusarium oxysporum Schlecht. f. sp. gladioli, causes severe stigma yield losses in L'Aquila Province in Central Italy. Primary symptoms during flowering (October through November) include basal stem rot, yellowing and wilting of shoots, and corm rot. The rapid spread of the disease is apparently caused only by movement of contaminated and/or infected corms (2,3). Ten isolates of F. oxysporum f. sp. gladioli, obtained from infected saffron crops located in the principal areas of saffron production in L'Aquila Province (2,3), were characterized by vegetative compatibility tests. The isolates were placed into vegetative compatibility groups (VCGs) using heterokaryon tests with chlorate-resistant nitrate-nonutilizing (nit) mutants. Based on complementation among these isolates and with a representative isolate of VCG 0340 (4), the tested isolates were assigned to VCG 0340. The fact that all isolates examined in this study belong to a single VCG supports the hypothesis that a clonal population of F. oxysporum f. sp. gladioli is spreading in L'Aquila Province in planting stock. In previous studies, only two Italian isolates of the pathogen obtained from Gladiolus were tested for vegetative compatibility, and both were included in VCG 0343 (1,4). Acquisition of further information on a larger number of isolates obtained from other cropping sites and associated with other hosts may result in a better understanding of the origin and spread of the pathogen in Italy, leading to improved strategies for control of Fusarium corm rot of saffron. References: (1) R. P. Baayen et al. Eur. J. Plant Pathol. 104:887, 1998. (2) C. Cappelli and G. Di Minco. Infitore Fitopatol. 49:27, 1999. (3) C. Cappelli and G. Di Minco. J. Plant Pathol. 80:253, 1998. (4) J. J. Mes et al. Plant Pathol. 43:362, 1994.

scholarly journals Identification of Sources of Resistance in Saffron (Crocus sativus L.) to Fusarium oxysporum Causing Corm Rot Disease

2017 ◽  
Vol 6 (11) ◽  
pp. 3660-3665
Author(s):  
Sabiya Bashir ◽  
Mohammad Najeeb Mughal ◽  
F.A. Nehvi ◽  
S.A. Dar ◽  
Seerat un nissa ◽  
...  
Keyword(s):  
Fusarium Oxysporum ◽  
Crocus Sativus ◽  
Sources Of Resistance ◽  
Rot Disease ◽  
Crocus Sativus L

Pathogenicity and genetic diversity of Fusarium oxysporum isolates from corms of Crocus sativus

2014 ◽  
Vol 61 ◽  
pp. 186-192 ◽  
Author(s):  
Daniel Palmero ◽  
Angela Rubio-Moraga ◽  
Laura Galvez-Patón ◽  
Jorge Nogueras ◽  
Carlos Abato ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Fusarium Oxysporum ◽  
Crocus Sativus

Tobacco Mosaic Virus-Infected Tissue

1985 ◽  
Vol 43 ◽  
pp. 510-511
Author(s):  
Egbert W. Henry
Keyword(s):  
Nicotiana Tabacum ◽  
Tobacco Mosaic Virus ◽  
Chlorogenic Acid ◽  
Mosaic Virus ◽  
Host Resistance ◽  
Oxidative Metabolism ◽  
Leaf Tissue ◽  
Vein Clearing ◽  
Basal Septum ◽  
Concentration Levels

Tobacco mosaic virus (TMV) infection has been studied in several investigations of Nicotiana tabacum leaf tissue. Earlier studies have suggested that TMV infection does not have precise infective selectivity vs. specific types of tissues. Also, such tissue conditions as vein banding, vein clearing, liquification and suberization may result from causes other than direct TMV infection. At the present time, it is thought that the plasmodesmata, ectodesmata and perhaps the plasmodesmata of the basal septum may represent the actual or more precise sites of TMV infection.TMV infection has been implicated in elevated levels of oxidative metabolism; also, TMV infection may have a major role in host resistance vs. concentration levels of phenolic-type enzymes. Therefore, enzymes such as polyphenol oxidase, peroxidase and phenylalamine ammonia-lyase may show an increase in activity in response to TMV infection. It has been reported that TMV infection may cause a decrease in o-dihydric phenols (chlorogenic acid) in some tissues.

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