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Research Interests


Area of Research: My lab is interested in understanding the mechanisms of attack and defense in the interaction between plants and their pathogens. Our model is the interaction between the bacterial pathogen, Xanthomonas oryzae pv. oryzae (Xoo) and it host plant which is rice. A major focus of our current research is to identify the rice functions that are involved in induction of innate immunity and Xoo effector proteins that work inside rice cells to suppress innate immune responses. Of particular interest are immune responses that are induced by Xoo secreted rice cell wall degrading enzymes and lipolysaccharide. In addition, we have been been studying a number of other Xoo virulence factors. A rice variety, called Improved Samba Mahsuri, that has been developed by us in collaboration with the Directorate of Rice Research exhibits excellent resistance against Xoo and has been released for commercial cultivation.

Selected Publications


Mahesh Kumar Gupta, RajkanwarNathawat, Dipanwita Sinha, Asfarul S. Haque, RajanSankaranarayanan, and Ramesh V. Sonti. 2015. Mutations in the Predicted Active Site of Xanthomonas oryzaepv. oryzaeXopQ Differentially Affect Virulence, Suppression of Host Innate Immunity, and Induction of the HR in a Nonhost Plant. Molecular Plant-Microbe Interactions. 28:2, 195-206.

 

Ashish Ranjan, JyothilakshmiVadassery, Hitendra Kumar Patel, Alok Pandey, Ramesh Palaparthi, Axel Mithofer, Ramesh V Sonti. 2015. Upregulation of jasmonate biosynthesis and jasmonate-responsive genes in rice leaves in response to a bacterial pathogen mimic. Functional & integrative genomics. 15:363-373.

 

Dipanwita Sinha, Mahesh Kumar Gupta, Hitendra Kumar Patel, Ashish Ranjan, Ramesh V. Sonti. 2013. Cell Wall Degrading Enzyme Induced Rice Innate Immune Responses Are Suppressed by the Type 3 Secretion System Effectors XopN, XopQ, XopX and XopZ of Xanthomonas oryzaepv. oryzae. PLoS ONE 8(9): e75867. doi: 10.1371/journal.pone.0075867.

 

Sujatha Subramoni, Alok Pandey, M. R. Vishnu Priya, Hitendra Kumar Patel and Ramesh V. Sonti. 2012. The ColRS system of Xanthomonas oryzaepv. oryzae is required for virulence and growth in iron-limiting conditions. Molecular Plant Pathology. 13:7, 690-703.

 

Gudlur Aparna, Avradip Chatterjee, Ramesh V. Sonti and RajanSankaranarayanan2009. A cell wall-degrading esterase of Xanthomonas oryzae requires a unique substrate recognition module for pathogenesis on rice. Plant Cell. 21(6):1860-73.

 

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Publications

TitleJournalYear
Rice Leaf Transcriptional Profiling Suggests a Functional Interplay Between Xanthomonas oryzae pv. oryzae Lipopolysaccharide and Extracellular Polysaccharide in Modulation of Defense Responses During Infection Molecular Plant-Microbe Interactions, http://dx.doi.org/10.1094/MPMI-08-16-0157-R 2017
Action of Multiple Cell Wall-Degrading Enzymes Is Required for Elicitation of Innate Immune Responses During Xanthomonas oryzae pv. oryzae Infection in Rice Molecular Plant-Microbe Interactions, 29 (8): 599-608.http://dx.doi.org/10.1094/MPMI-02-16-0039-R 2016
Identification of Pectin Degrading Enzymes Secreted by Xanthomonas oryzae pv. oryzae and Determination of Their Role in Virulence on Rice PLoS One. 2016; 11(12): e0166396. 2016
Identification of Pectin Degrading Enzymes Secreted by Xanthomonas oryzae pv. oryzae and Determination of Their Role in Virulence on Rice PLoS One. 2016; 11(12): e0166396. 2016
The rice immune receptor XA21 recognizes a tyrosine-sulfated protein from a Gram-negative bacterium. Science Advances, 1(6):e1500245. 2015
Mutations in the Predicted Active Site of Xanthomonas oryzae pv. oryzae XopQ Differentially Affect Virulence, Suppression of Host Innate Immunity, and Induction of the HR in a Nonhost Plant Molecular Plant-Microbe Interactions, 28(2):195-206. 2015
Upregulation of jasmonate biosynthesis and jasmonate-responsive genes in rice leaves in response to a bacterial pathogen mimic. Functional & Integrative Genomics, 15(3):363-73. 2014
Update on Bacterial Blight of Rice: Fourth International Conference on Bacterial Blight Rice, 7(1):12. 2014
Excised radicle tips as a source of genomic DNA for PCR-based genotyping and melting curve analysis in cotton. Journal of Biosciences , 38(1):167-72. 2013
gltB/D Mutants of Xanthomonas oryzae pv. Oryzae are Virulence Deficient Current Microbiology, 68(1):105-12. 2013
Cell wall degrading enzyme induced rice innate immune responses are suppressed by the type 3 secretion system effectors XopN, XopQ, XopX and XopZ of Xanthomonas oryzae pv. oryzae. PLoS One, 8(9):e75867. 2013
Pathotype and genetic diversity amongst Indian isolates of Xanthomonas oryzae pv. oryzae. PLoS One, 8(11):e81996. 2013
The CoIRS system of Xanthomonas oryzae pv. Oryzae is required for virulence and growth in iron-limiting conditions Molecular Plant Pathology, 13(7):690-703. 2012
Crystallization and preliminary crystallographic studies of CbsA, a secretory exoglucanase from Xanthomonas oryzae pv. oryzae. Acta crystallographica. Section F, Structural Biology and Cristallization Communications, 68(Pt 10):1191-4. 2012
Two New complete Genome Sequeces offer Insight into Host and Tissue Specificity of Plant Pathogenic Xanthomonas spp. Bacteriology, 193(19): 5450-5464 2011
Role of the FeoB Protein and Siderophore in Promoting Virulence of Xanthomonas oryzae pv. Oryzae on Rice Bacteriology, 192(12): 3187-3203 2010
Multiple Adhesin-Like Functions of Xanthomonas oryzae pv. Oryzae are Involved in Promoting Leaf Attachment, Entry, and Virulence on Rice Molecular Plant-Microbe Interactions, 22 (1): 73-85. 2009
Introduction of bacterial blight resistance into Triguna, a high yielding, mid-early duration rice variety. Biotechnoogy Journal, 4(3):400-7. 2009
Transcriptional profiling of rice leaves undergoing a hypersensitive response like reaction induced by Xanthomonas oryzae pv. oryzae cellulase Rice, 3 (1): 1-21 2009
A cell wall-degrading esterase of Xanthomonas oryzae requires a unique substrate recognition module for pathogenesis on rice. The Plant Cell, 21(6):1860-73. 2009
Genome Sequence and rapid evolution of the rice pathogen Xanthomonas oryzae pv. Oryzae PXO99? BMC Genomics, 9:204, 1-16. 2008
Fuctional Interplay Between Two Xanthomonas oryzae pv. Oryzae Secretion Systems in Modulating Virulence on Rice Molecular Plant-Microbe Interactions, 20(1): 31-40. 2007
Crystallization and preliminary crystallographic studies of LipA, a secretory lipase/esterase from Xanthomonas oryzae pv. oryzae. Acta crystallographica. Section F, Structural Biology and Cristallization Communications, 63(Pt 8):708-10. 2007
The role of horizontal transfer in the evolution of a highly variable lipopolysaccharide biosynthesis locus in xanthomonads that infect rice, citrus and crucifers BMC Evolutionary Biology, 7:243, 1-13. 2007
Growth Deficiency of a Xanthomonas oryzae pv. Oryzae fur Mutant in Rice Leaves Is Rescued by Ascorbic Acid Supplementation Molecular Plant-Microbe Interactions, 18(7): 644-651 2005
Role of an In Planta-Expressed Xylanase of Xanthomonas oryzae pv. Oryzae in Promoting Virulence on Rice Molecular Plant-Microbe Interactions, 18(8): 830-837 2005
Bacterial type two secretion system secreted proteins: double-edged swords for plant pathogens. Molecular Plant-Microbe Interactions, 18(9):891-8. 2005
Virulence deficiency caused by a transposon insertion in the purH gene of Xanthomonas oryzae pv. oryzae Can. J. Microbiol. 51: 1-7 2005
Genomics, Molecular Genetics & Biotechnology Crop Science, 44:920-924 2004
Variation suggestive of horizontal gene transfer at a lipopolysaccharide(lps) biosynthetic locus in Xanthomonas oryzae pv. oyzae, the bacterial leaf blight pathogen of rice BMC Microbiology, 4: 1-14 2004
PhyA, a Secreted protein of Xathomonas oryzae pv. Oryzae, Is Required for Optimum Virulence and Growth on Phytic Acid as a Sole Phosphate Source Molecular Plant-Microbe Interactions, 16(11): 973-982 2003
Assessment of Purity of Rice Hybrids Using Microsatellite and STS Markers Crop Science, 42:1369-1373 2002
rpfF Mutants of Xanthomonas oryzae pv. Oryzae Are Deficient for Virulence and Growth Under Low Iron Conditions Molecular Plant-Microbe Interactions, 15(5): 463-471 2002
Genetic Locus Encoding Functions Involved in Biosynthesis and Outer Membrane Localization of Xanthomonadin in Xathomonas oryzae pv.oryzae Bacteriology, 184(13): 3539-3548 2002
A high-molecular-weight outer membrane protein of Xanthomonas oryzae pv. Oryzae exhibits similarity to non-fimbrial adhesins of animal pathogenic bacteria and is required for optimum virulence Molecular Microbiology 46(3), 637-647 2002
Pigment and Virulence Deficiencies Associated with Mutations in the aroE Gene of Xanthomonas oryzae pv. oryzae Applied and Environmental Microbiology, 67(1):245-250 2001
Novel Genomic Locus with Atypical G+C Content that is Required for Extracellular Polysaccharide Production and Virulence in Xanthomonas oryzae pv.oryzae Molecular Plant-Microbe Interactions, 14(11): 1335-1339 2001
Mutants of Xanthomonas oryzae pv. Oryzae Deficient in General Secretory Pathway Are Virulence Deficient and Unable to Secrete Xylanase Molecular Plant -Microbe Interaction, 13(4):394-401 2000
Stationary-Phase Variation Due to Transposition of Novel Insertion Elements in Xanthomonas oryzae pv.oryzae Bacteriology, 182(17):4797-4802 2000
A transposon insertion in the gumG homologue of Xanthomonas oryzae pv. Oryzae causes loss of extracellular polysaccharide production and virulence FEBS Microbiology Letters, 179:53-59 1999
A Widely Distributed Lineage of Xanthomonas oryzae pv. Oryzae in India May Have Come From Native Wild Rice Plant Disease, 84(4):465-469 1999
Bacterial leaf blight of rice: New insights from molecular genetics Current Science, 74(3):206-212 1998
Genetic Diversity within the Population of Xanthomonas oryzae pv. Oryzae in India Phytopathology, 87(7): 760-765 1997
Characteristics of stationary-phase variation affecting virulence in Xanthomonas oryzae pv. Oryzae Can. J. Microbiol. 43: 862-867 1997
The Bacterial pigment xanthomonadin offers protection against photodamage FEBS Letters, 415:125-128 1997
Molecular Genetics studies of the Bacterial leaf blight pathogen of rice in India http://agris.fao.org/aos/records/QR1998000037 (939-944) 1996
Activity of the yeast FLP recombinase in Arabidopsis Plant Molecular Biology, 28: 1127-1132 1995
Arabidopsis mutants deficient in T-DNA integration Genetics, 92:11786-11790 1995
Transformation of Rice Genetics Genetics, 74: 139-143 1995
Molecular Mechanisms of Bacterial Pathogenesis of Plants Genomics and Crop Improvement: Relevace and Reservatios, 141-153 1993
Lethal Trasposition of Mud Phages in Rec? Strains of Salmonella typhimurium Genetics, 133: 17-28 1993
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Ramesh V Sonti

Chief Scientist

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sonti@ccmb.res.in

Hitendra Kumar Patel

Principal Scientist

2647

hkpatel@ccmb.res.in

Raju Madanala

Senior Technical Officer

2647

raju.m@ccmb.res.in

B Kranthi

Technical Officer

2598

kranthi.brahma@ccmb.res.in

Jamaloddin

Research Associate-I

2647

jamal@ccmb.res.in

Donald James

Research Associate-I

2647

donald@ccmb.res.in

Niranjani

Research Associate-I

2778

niranjani@ccmb.res.in

Shakuntala E. Pillai

Senior Research Fellow

2599

shakuntala@ccmb.res.in

Neha Rajendra Kachewar

Senior Research Fellow

2599

nehakachewar@ccmb.res.in

Gokulan C G

Senior Research Fellow

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gokulan@ccmb.res.in

Komal Ashok Awalellu

Senior Research Fellow

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komal@ccmb.res.in

K Bipin Kumar

Project Assistant-II

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bipin@ccmb.res.in

RajKanwar Nathawat

Project Assistant-II

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rajkanwar@ccmb.res.in

Kamal Kumar Malukani

Project Assistant-II

2647

kamal@ccmb.res.in

Sohini Deb

Project Assistant-II

2599

sohinideb@ccmb.res.in

Vishnu Narayanan M

Project Assistant-II

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vishnu.m@ccmb.res.in

Namami Gaur

Project Assistant-II

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namamigaur@ccmb.res.in

Palash Gosh

Project Assistant-II

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palashg@ccmb.res.in

Ram Chandra Panigrahi

Project Assistant-II

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ramchandra@ccmb.res.in

Mani Deepika M

Project Assistant-II

2598

manideepika@ccmb.res.in

Pranali Vankore

Project Assistant-II

2647

pranaliv@ccmb.res.in

Rennya PR

Project Assistant-II

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prrennya@ccmb.res.in

Roshan Maku

Research Associate-I

2647

rosh.mv@ccmb.res.in

Shailaja Kanumuri

Project Assistant-II

2599

shailaja@ccmb.res.in

Hemsagar Patel

Field Assistant

2599

Vutukuri Rani

Field Assistant

2599

Valluri Shiva Rambabu

Field Assistant

2599

Rupdhar Yadav

Field Assistant

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