Plant Molecular Biology

, Volume 88, Issue 1–2, pp 177–191 | Cite as

Characterization of a vacuolar processing enzyme expressed in Arachis diogoi in resistance responses against late leaf spot pathogen, Phaeoisariopsis personata

  • Dilip Kumar
  • Sakshi Rampuria
  • Naveen Kumar Singh
  • Pawan Shukla
  • P. B. Kirti


Vacuolar processing enzymes are cysteine proteases responsible for maturation of vacuolar proteins. They have been shown to possess caspase-1-like activity, mediate cell death and display increased activity during pathogen infections. A transcript derived fragment corresponding to VPE was found to be up-regulated in a cDNA-AFLP analysis of host responses of a wild peanut, Arachis diogoi upon challenge from the late leaf spot pathogen Phaeoisariopsis personata, which was subsequently validated by q-PCR in a time course analysis, where susceptible peanut did not show its upregulation. In transient conditional and constitutive expression studies in tobacco leaves using agroinfiltration, we have observed that expression of AdVPE was associated with hypersensitive response (HR) like cell death. AdVPE expression was found to be high at 24 h post estradiol application and this was associated with the enhanced co-expression of molecular markers of HR cell death genes and genes for pathogenesis related proteins indicating that AdVPE positively regulates defense responses and its estradiol induced expression is sufficient for HR-like cell death in tobacco. We found that AdVPE expression was very strongly induced in response to sodium nitroprusside, which indicates its involvement in stress signaling. Induced expression of AdVPE in response to jasmonic acid and ethylene also indicates its involvement in an interconnected network of signaling. Transgenic tobacco plants ectopically expressing AdVPE exhibited enhanced resistance against Phytophthora parasitica var. nicotianae, Alternaria alternata var.  nicotianae and Rhizoctonia solani. To our knowledge, this is the first report on the heterologous expression of a pathogen induced VPE enhancing resistance to fungal pathogens with cell death phenomenon under transient expression.


Arachis diogoi Vacuolar processing enzyme Transgenic tobacco HR-like cell death Pathogen resistance 



This work has been supported by the Department of Biotechnology, Government of India in the form of a research project to PBK with the reference BT/PR6853/PBD/16/627/2005. Facilities from the Department of Plant Sciences, University of Hyderabad under UGC-CAS, DST-FIST and DBT-CREBB are acknowledged. The germplasm of A. diogoi was kindly provided by ICRISAT, Patancheru, India.

Supplementary material

11103_2015_318_MOESM1_ESM.doc (4.1 mb)
Supplementary material 1 (DOC 4198 kb)


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Copyright information

© Springer Science+Business Media Dordrecht 2015

Authors and Affiliations

  • Dilip Kumar
    • 1
  • Sakshi Rampuria
    • 1
  • Naveen Kumar Singh
    • 1
  • Pawan Shukla
    • 1
  • P. B. Kirti
    • 1
  1. 1.Department of Plant Sciences, School of Life SciencesUniversity of HyderabadHyderabadIndia

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