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  1. Article ; Online: Antibiotic-producing Pseudomonas fluorescens mediates rhizome rot disease resistance and promotes plant growth in turmeric plants.

    Prabhukarthikeyan, S R / Keerthana, U / Raguchander, T

    Microbiological research

    2018  Volume 210, Page(s) 65–73

    Abstract: Rhizome rot of turmeric caused by Pythium aphanidermatum is a major threat to turmeric-cultivating areas of India. This study intends to evaluate the performance of fluorescent pseudomonads against Rhizome rot disease and understand the resistance ... ...

    Abstract Rhizome rot of turmeric caused by Pythium aphanidermatum is a major threat to turmeric-cultivating areas of India. This study intends to evaluate the performance of fluorescent pseudomonads against Rhizome rot disease and understand the resistance mechanism in Turmeric plants. Fluorescent pseudomonads were screened against Pythium aphanidermatum using dual culture. Selected strains were evaluated for the performance of growth promoting attributes and the presence of antibiotic genes through PCR analysis. Strain FP7 recorded the maximum percent inhibition of P. aphanidermatum under in vitro conditions. Strains FP7 and TPF54 both increased plant growth in turmeric plants in vitro. Strain FP7 alone contained all the evaluated antibiotic biosynthetic genes. Talc and liquid-based formulations were prepared with effective strain and tested for its biocontrol activities under both glasshouse and field conditions. Enzymatic activities of the induced defense enzymes such as PO, PPO, PAL, CAT and SOD were estimated and subjected to spectrophotometric analysis. A combination of rhizome dip and soil drench of FP7 liquid formulation treatment remarkably recorded the minimum disease incidence, higher defense enzymes, maximum plant growth and yield under glasshouse and field conditions. Application of strain FP7 increased the defense molecules, plant growth and yield in turmeric plants thereby reducing the incidence of rhizome rot disease. Moreover, this study has a potential to be adopted for sustainable and eco-friendly turmeric production.
    MeSH term(s) Anti-Bacterial Agents/biosynthesis ; Anti-Bacterial Agents/chemistry ; Anti-Bacterial Agents/pharmacology ; Antifungal Agents/chemistry ; Antifungal Agents/metabolism ; Antifungal Agents/pharmacology ; Biological Control Agents/chemistry ; Biological Control Agents/metabolism ; Biological Control Agents/pharmacology ; Catalase/metabolism ; Catechol Oxidase/metabolism ; Curcuma/drug effects ; Curcuma/growth & development ; Curcuma/microbiology ; Disease Resistance ; Genes, Bacterial/genetics ; India ; Peroxidase/metabolism ; Phenylalanine Ammonia-Lyase/metabolism ; Plant Development/drug effects ; Plant Diseases/microbiology ; Plant Diseases/prevention & control ; Pseudomonas fluorescens/genetics ; Pseudomonas fluorescens/metabolism ; Pythium/drug effects ; Pythium/pathogenicity ; Rhizome/enzymology ; Rhizome/microbiology ; Soil Microbiology
    Chemical Substances Anti-Bacterial Agents ; Antifungal Agents ; Biological Control Agents ; Catechol Oxidase (EC 1.10.3.1) ; Catalase (EC 1.11.1.6) ; Peroxidase (EC 1.11.1.7) ; Phenylalanine Ammonia-Lyase (EC 4.3.1.24)
    Language English
    Publishing date 2018-03-27
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 1189614-0
    ISSN 1618-0623 ; 0944-5013
    ISSN (online) 1618-0623
    ISSN 0944-5013
    DOI 10.1016/j.micres.2018.03.009
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Deciphering the Role of Bacillus subtilis var. amyloliquefaciens in the Management of Late Blight Pathogen of Potato, Phytophthora infestans

    Keerthana, U / G. Karthikeyan / K. Nagendran / K. Prabakar / L. Rajendran / T. Raguchander

    Proceedings of the National Academy of Sciences, India, Section B: biological sciences. 2018 Sept., v. 88, no. 3

    2018  

    Abstract: An oomycete fungus Phytophthora infestans (Mont.) de Bary, is an incitant of destructive late blight disease on potato, causes severe yield loss worldwide. A study was undertaken for the management of the diseases by using the antagonistic bacterium. ... ...

    Abstract An oomycete fungus Phytophthora infestans (Mont.) de Bary, is an incitant of destructive late blight disease on potato, causes severe yield loss worldwide. A study was undertaken for the management of the diseases by using the antagonistic bacterium. Twenty-five isolates of antagonistic bacteria were collected from various parts of Tamil Nadu from rhizospheric soils of Solanaceous crops potato, tomato and Solanum nigrum. These isolates were tested in vitro for its efficacy against P. infestans along with the FZB 24 strain of Bacillus subtilis var. amyloliquefaciens of M/S. Novozymes South Asia Ltd. B. subtilis var. amyloliquefaciens (FZB 24) showed a maximum inhibition of 35.56% against P. infestans. Based on this initial screening, the FZB 24 was used for further investigation under glass house and field conditions for the late blight disease management in potato. The glasshouse studies revealed that the application of corn flour formulation of B. subtilis var. amyloliquefaciens (FZB 24) as foliar spray @ 0.2% at 7 days interval for six times had shown significant reduction of 49.7% late blight severity over control. In addition, the potato plants from the above treatment showed higher activity of defence related enzymes such as peroxidase, polyphenol oxidase and phenylalanine ammonia lyase, which lead to higher accumulation of total phenols in comparison to untreated control plants. Under field conditions, B. subtilis var. amyloliquefaciens (FZB 24) treated potato plots registered significantly less severity of late blight disease which recorded higher tuber yield of 15.5 t/ha as against 9.4 t/ha in control.
    Keywords Bacillus subtilis ; bacteria ; catechol oxidase ; corn flour ; disease control ; foliar spraying ; fungi ; greenhouse experimentation ; greenhouses ; pathogens ; peroxidase ; phenylalanine ammonia-lyase ; Phytophthora infestans ; potatoes ; screening ; soil ; Solanum nigrum ; tomatoes ; tubers ; India
    Language English
    Dates of publication 2018-09
    Size p. 1071-1080.
    Publishing place Springer India
    Document type Article
    ZDB-ID 2707745-7
    ISSN 2250-1746 ; 0369-8211
    ISSN (online) 2250-1746
    ISSN 0369-8211
    DOI 10.1007/s40011-017-0842-3
    Database NAL-Catalogue (AGRICOLA)

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  3. Article: Elucidation of the population structure and genetic diversity of Bipolaris oryzae associated with rice brown spot disease using SSR markers

    Keerthana, U. / Phalguni, M. / Prabhukarthikeyan, S. R. / Naveenkumar, R. / Yadav, Manoj K. / Parameswaran, C. / Baite, Mathew S. / Raghu, S. / Reddy, Madem Gurivi / Harish, S. / Panneerselvam, P. / Rath, P. C.

    3 Biotech. 2022 Oct., v. 12, no. 10

    2022  

    Abstract: Brown spot disease, caused by Bipolaris oryzae, is one of the several disastrous diseases affecting rice. The brown spot fungus illustrates substantial pathogenic and genetic variability. To the best of our knowledge, extensive analysis utilizing ... ...

    Abstract Brown spot disease, caused by Bipolaris oryzae, is one of the several disastrous diseases affecting rice. The brown spot fungus illustrates substantial pathogenic and genetic variability. To the best of our knowledge, extensive analysis utilizing specific SSR primers for B. oryzae genome is quite inadequate for the population structure and genetic diversity of Indian B. oryzae isolates. A total of 84 brown spot isolates were collected from rice-cultivating areas across southern and eastern Indian states, viz., Tamil Nadu, Andhra Pradesh, Odisha and Chhattisgarh. The pathogenicity and virulence characteristics of these isolates were assessed with the susceptible cultivar CR Dhan 201. Twelve genome-specific SSR markers of B. oryzae warranted the investigation of the population structure and genetic diversity among the isolates. These isolates were categorized based on their disease grade as highly virulent isolates (4 nos.), virulent isolates (8 nos.), moderately virulent isolates (47 nos.) and less virulent isolates (25 nos.). PCR amplification and DNA sequencing confirmed the isolates to be B. oryzae. PCR amplification and DNA sequencing confirmed the isolates to be B. oryzae. The SSR markers produced a total of 35 alleles with 1 to 4 alleles per locus with a gene diversity ranging between 0.00 and 0.687 and a major allele frequency variation of 0.425–0.975. The PIC value ranged from 0.00 to 0.638 having a mean value of 0.34. Cluster analysis technique was applied to group the brown spot isolates into four distinct clusters. Principal coordinate and structure analysis identified two genetic clusters of B. oryzae isolates for individual states with some degree of distinctness complying with their virulence. Analysis of molecular variance revealed more genetic variation within populations and less among populations. The study outcome would expedite the comprehension of genetic diversity of B. oryzae across the southern and eastern states of India. Furthermore, we anticipate its guidance in the development of more effective disease management strategies as well as in the generation of novel resistant varieties through marker-assisted breeding.
    Keywords Bipolaris oryzae ; DNA ; cluster analysis ; cultivars ; disease control ; fungal brown spot ; fungi ; gene frequency ; genetic variation ; genome ; loci ; population structure ; rice ; variance ; virulence ; India
    Language English
    Dates of publication 2022-10
    Size p. 281.
    Publishing place Springer International Publishing
    Document type Article
    ZDB-ID 2600522-0
    ISSN 2190-5738 ; 2190-572X
    ISSN (online) 2190-5738
    ISSN 2190-572X
    DOI 10.1007/s13205-022-03347-4
    Database NAL-Catalogue (AGRICOLA)

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  4. Article: Elucidation of the population structure and genetic diversity of

    Keerthana, U / Phalguni, M / Prabhukarthikeyan, S R / Naveenkumar, R / Yadav, Manoj K / Parameswaran, C / Baite, Mathew S / Raghu, S / Reddy, Madem Gurivi / Harish, S / Panneerselvam, P / Rath, P C

    3 Biotech

    2022  Volume 12, Issue 10, Page(s) 281

    Abstract: Brown spot disease, caused by : Supplementary information: The online version contains supplementary material available at 10.1007/s13205-022-03347-4. ...

    Abstract Brown spot disease, caused by
    Supplementary information: The online version contains supplementary material available at 10.1007/s13205-022-03347-4.
    Language English
    Publishing date 2022-09-17
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 2600522-0
    ISSN 2190-5738 ; 2190-572X
    ISSN (online) 2190-5738
    ISSN 2190-572X
    DOI 10.1007/s13205-022-03347-4
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article: Deciphering environmental factors and defense response of rice genotypes against sheath blight disease.

    Naveenkumar, R / Anandan, A / Singh, Vineeta / Prabhukarthikeyan, S R / Parameswaran, C / Sangeetha, G / Mahender, A / Keerthana, U / Singh, P K / Patra, B C / Ali, Jauhar

    Physiological and molecular plant pathology

    2022  Volume 122, Page(s) 101916

    Abstract: Sheath blight (ShB) is one of the most serious diseases in rice, leading to severe yield losses globally. In our study, we evaluated a total of 63 rice genotypes for resistance against sheath blight disease by artificial inoculation over two seasons ... ...

    Abstract Sheath blight (ShB) is one of the most serious diseases in rice, leading to severe yield losses globally. In our study, we evaluated a total of 63 rice genotypes for resistance against sheath blight disease by artificial inoculation over two seasons under field conditions and studied the weather parameters associated with disease incidence. Based on two years of testing, 23 genotypes were found moderately resistant, 38 were moderately susceptible, and 2 exhibited a susceptible reaction to sheath blight disease. Among the specific four genotypes (IC283139, IC283041, IC283038, and IC283023) of the moderately resistant group exhibited less disease reaction in comparison with check variety Tetep. Further, the correlation of percent disease index (PDI) with weather parameters revealed negative associations between PDI and maximum temperature, minimum temperature, low rainfall and the positive association with maximum relative humidity (RH) suggest that very low temperature or high precipitation might have a negative impact on pathogen establishment. In addition, the sheath blight-linked SSRs were assessed using distance and model-based approaches, results of both the models revealed that genotypes distinguished the resistant population from the susceptible one. From the output of two years of principal component analysis, two genotypes from each group of moderately resistant, moderately susceptible and susceptible were studied for their biochemical reaction against the sheath blight pathogen. The biochemical study revealed that the accumulation of defense and antioxidant enzymes, namely, polyphenol oxidase, peroxidase, total phenol, phenylalanine ammonia-lyase, catalase, and superoxide dismutase, were higher in moderately resistant genotypes, but was observed to be lower in moderately susceptible and susceptible genotypes. The statistical analysis revealed the enzyme activities (defense and antioxidant) exhibited a strong negative correlation with area under the disease progress curve (AUDPC) and influence of weather parameter RH. This demonstrates that the environment factor RH plays a major role in imparting the resistance mechanism by decreasing the enzymes activities and increasing PDI. This study found that the identified novel resistant genotype (IC283139) with purple stem base demonstrated improved resistance against sheath blight infection through a defense response and the use of antioxidant machinery.
    Language English
    Publishing date 2022-09-16
    Publishing country England
    Document type Journal Article
    ZDB-ID 742470-x
    ISSN 0885-5765
    ISSN 0885-5765
    DOI 10.1016/j.pmpp.2022.101916
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article: First report of Fusarium proliferatum causing Sheath Rot Disease of Rice in Eastern India.

    Prabhukarthikeyan, S R / Keerthana, U / Krishnan, Nagendran / M K, Yadav / C, Parameswaran / P, Panneerselvam / P C, Rath

    Plant disease

    2020  

    Abstract: Sheath rot is one of the most devastating diseases of rice because of its ability to reduce the yield significantly in all rice cultivating areas of the world (Bigirimana et al., 2015). Sheath rot disease is associated with various pathogens such as ... ...

    Abstract Sheath rot is one of the most devastating diseases of rice because of its ability to reduce the yield significantly in all rice cultivating areas of the world (Bigirimana et al., 2015). Sheath rot disease is associated with various pathogens such as Sarocladium oryza, Fusarium fujikuroi complex and Pseudomonas fuscovaginae (Bigirimana et al., 2015). Hence, this disease has become more complex in nature and added more seriousness. From September to December 2018, plants were observed with typical sheath rot symptoms in research farm of ICAR-National Rice Research Institute and ten farmer's fields of Cuttack district, Odisha, Eastern India. About 25 to 37% of sheath rot disease severity was recorded in the infected field. Diseased plants were observed with symptoms such as brownish or reddish brown irregular lesions, which were later, got enlarged with grayish centers. Further, rotting of the topmost leaf sheaths that surround the young panicle was observed. At the severe stages, the young panicle was partially emerged from sheath or completely rotted within the sheath. The white to pinkish powdery growth observed inside the infected sheath leading to chaffy and discolored grains. The sheath rot symptomatic plants were collected from the infected fields. To isolate the causal pathogen, infected sheath tissues were surface sterilized in 1% sodium hypochlorite for 2 min, rinsed three times in sterile distilled water, and placed on potato dextrose agar medium (PDA) (HiMedia). Plates were incubated at 27 ± 1° C for 3 d. Further, fungal pathogen colonies were sub-cultured and purified to perform the pathogenicity test. On PDA, the colonies produced abundant white aerial mycelium with violet to pink pigmentation and hyphae were hyaline with septation. Abundant single celled, oval shaped microcondia (5.5-9 × 1.5-2 μm) were produced, whereas macrocondia were not produced and the fungal pathogen was tentatively identified as Fusarium sp. In order to characterize the pathogen at molecular level, ITS, alpha elongation factor gene (EF1-α), RNA polymerase II largest-subunit gene (RPB2), calmodulin gene (cld) were amplified using the primer pair of ITS1/ITS4, EF1/EF2, 5F/7CR and CLPRO1/CLPRO2 respectively and PCR amplicons were subjected to sequencing (White et al. 1990; O'Donnell et al. 1998; Chang et al. 2015). Furthermore, a species-specific primer Fp3-F/Fp4-R was used to identify the pathogen (Jurado et al., 2006). The resulting sequences were confirmed by BLAST analysis and the FUSARIUM-ID database (http://isolate.fusariumdb.org). BLASTn search showed 100% similarity between the query sequence and ITS, EF1-α, RPB2, Calmodulin gene sequences of F. proliferatum available in the Genbank. The following GenBank accession numbers were obtained; MT394055 for ITS; MT439867 for EF1-α; MT790774 for calmodulin; MT940224 for RPB2 and MT801050 for species-specific to F. proliferatum. To confirm the pathogenicity under glass house conditions, fungus grown on sterilized chaffy grains were placed in between boot leaf sheath and panicle and covered with moist cotton (Saravanakumar et al., 2009). After 15 days post inoculation (dpi), rotting symptoms were observed and these were similar to that of field symptoms. Pathogen was constantly re-isolated from symptomatic tissue, satisfying Koch's postulates. Disease symptoms were not observed on un-inoculated plants. Morphological characters, pathogenicity test and molecular characterization have identified the pathogen as F. proliferatum. To the best of our knowledge, this is the first confirmed report of F. proliferatum causing sheath rot disease on rice from Eastern India.
    Language English
    Publishing date 2020-10-06
    Publishing country United States
    Document type Journal Article
    ZDB-ID 754182-x
    ISSN 0191-2917
    ISSN 0191-2917
    DOI 10.1094/PDIS-08-20-1846-PDN
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article: Deciphering environmental factors and defense response of rice genotypes against sheath blight disease

    Naveenkumar, R. / Anandan, A. / Singh, Vineeta / Prabhukarthikeyan, S.R. / Parameswaran, C. / Sangeetha, G. / Mahender, A. / Keerthana, U. / Singh, P.K. / Patra, B.C. / Ali, Jauhar

    Physiological and molecular plant pathology. 2022 Sept. 15,

    2022  

    Abstract: Sheath blight (ShB) is one of the most serious diseases in rice, leading to severe yield losses globally. In our study, we evaluated a total of 63 rice genotypes for resistance against sheath blight disease by artificial inoculation over two seasons ... ...

    Abstract Sheath blight (ShB) is one of the most serious diseases in rice, leading to severe yield losses globally. In our study, we evaluated a total of 63 rice genotypes for resistance against sheath blight disease by artificial inoculation over two seasons under field conditions and studied the weather parameters associated with disease incidence. Based on two years of testing, 23 genotypes were found moderately resistant, 38 were moderately susceptible, and 2 exhibited a susceptible reaction to sheath blight disease. Among the specific four genotypes (IC283139, IC283041, IC283038, and IC283023) of the moderately resistant group exhibited less disease reaction in comparison with check variety Tetep. Further, the correlation of percent disease index (PDI) with weather parameters revealed negative associations between PDI and maximum temperature, minimum temperature, low rainfall and the positive association with maximum relative humidity (RH) suggest that very low temperature or high precipitation might have a negative impact on pathogen establishment. In addition, the sheath blight-linked SSRs were assessed using distance and model-based approaches, results of both the models revealed that genotypes distinguished the resistant population from the susceptible one. From the output of two years of principal component analysis, two genotypes from each group of moderately resistant, moderately susceptible and susceptible were studied for their biochemical reaction against the sheath blight pathogen. The biochemical study revealed that the accumulation of defense and antioxidant enzymes, namely, polyphenol oxidase, peroxidase, total phenol, phenylalanine ammonia-lyase, catalase, and superoxide dismutase, were higher in moderately resistant genotypes, but was observed to be lower in moderately susceptible and susceptible genotypes. The statistical analysis revealed the enzyme activities (defense and antioxidant) exhibited a strong negative correlation with area under the disease progress curve (AUDPC) and influence of weather parameter RH. This demonstrates that the environment factor RH plays a major role in imparting the resistance mechanism by decreasing the enzymes activities and increasing PDI. This study found that the identified novel resistant genotype (IC283139) with purple stem base demonstrated improved resistance against sheath blight infection through a defense response and the use of antioxidant machinery.
    Keywords antioxidants ; catalase ; catechol oxidase ; disease incidence ; disease progression ; genotype ; leaf blight ; pathogens ; peroxidase ; phenols ; phenylalanine ammonia-lyase ; plant pathology ; principal component analysis ; rain ; relative humidity ; rice ; superoxide dismutase ; temperature
    Language English
    Dates of publication 2022-0915
    Publishing place Elsevier Ltd
    Document type Article
    Note Pre-press version
    ZDB-ID 742470-x
    ISSN 0885-5765
    ISSN 0885-5765
    DOI 10.1016/j.pmpp.2022.101916
    Database NAL-Catalogue (AGRICOLA)

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  8. Article: First report of Zucchini yellow mosaic virus on Cucurbita moschata in India (Disease Note)

    Nagendran, K. / Priyanka, R. / Keerthana, U. / Mohankumar, S. / Karthikeean, G.

    Journal of plant pathology

    2016  Volume 98, Issue 1, Page(s) 173

    Language English
    Document type Article
    ZDB-ID 1378427-4
    ISSN 1125-4653
    Database Current Contents Nutrition, Environment, Agriculture

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  9. Article ; Online: Comparative Proteomic Analysis of

    Prabhukarthikeyan, Seenichamy Rathinam / Parameswaran, Chidambaranathan / Sawant, Shraddha Bhaskar / Naveenkumar, Ramasamy / Mahanty, Arabinda / Keerthana, Umapathy / Yadav, Manoj Kumar / Anandan, Annamalai / Panneerselvam, Periyasamy / Bag, Manas Kumar / Rath, Prakash Chandra

    Journal of fungi (Basel, Switzerland)

    2022  Volume 8, Issue 4

    Abstract: Sheath blight of rice is a destructive disease that could be calamitous to rice cultivation. The significant objective of this study is to contemplate the proteomic analysis of the high virulent and less virulent isolate ... ...

    Abstract Sheath blight of rice is a destructive disease that could be calamitous to rice cultivation. The significant objective of this study is to contemplate the proteomic analysis of the high virulent and less virulent isolate of
    Language English
    Publishing date 2022-04-05
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2784229-0
    ISSN 2309-608X ; 2309-608X
    ISSN (online) 2309-608X
    ISSN 2309-608X
    DOI 10.3390/jof8040370
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Correction: Blast resistance in Indian rice landraces: Genetic dissection by gene specific markers.

    Yadav, Manoj Kumar / Aravindan, S / Ngangkham, Umakanta / Raghu, S / Prabhukarthikeyan, S R / Keerthana, U / Marndi, B C / Adak, Totan / Munda, Susmita / Deshmukh, Rupesh / Pramesh, D / Samantaray, Sanghamitra / Rath, P C

    PloS one

    2019  Volume 14, Issue 3, Page(s) e0213566

    Abstract: This corrects the article DOI: 10.1371/journal.pone.0211061.]. ...

    Abstract [This corrects the article DOI: 10.1371/journal.pone.0211061.].
    Language English
    Publishing date 2019-03-05
    Publishing country United States
    Document type Published Erratum
    ISSN 1932-6203
    ISSN (online) 1932-6203
    DOI 10.1371/journal.pone.0213566
    Database MEDical Literature Analysis and Retrieval System OnLINE

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