Abstract
Differential expression of three important genes encoding pathogenesis related proteins (PR proteins) viz. β-1,3-glucanase (PR-2), osmotin (PR-5) and cytosolic ascorbate peroxidase (cAPX, PR-9) were carried out in Phytophthora susceptible (Sreekara) and resistant (04-P24) black pepper lines compared to uninoculated plants using quantitative reverse transcription PCR (qRT-PCR). Upon Phytophthora capsici inoculation, expression of these three genes were either up-regulated or down-regulated. In the susceptible line, all three genes were expressed maximally on 1 day after inoculation (DAI) and thereafter the expression declined. In the resistant line, a steady increase in the expression pattern of genes was noticed during the course of infection. Highest expression levels of cAPX were noticed on 3 DAI and that of β-1, 3-glucanase and osmotin genes were maximum on 5 DAI. Soil inoculation of P. capsici affected the transcriptional activity of these genes in stem tissue also, indicating systemic defense response against the pathogen.
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Acknowledgements
This research was funded by the Kerala State Council for Science, Technology and Environment (KSCSTE), Council Order No. (T)364/FSHP/2010/CSTE, Thiruvananthapuram, Kerala, India. Authors acknowledge Director, ICAR-IISR, Kozhikode, Kerala, India for facilities provided. Authors are grateful to Dr. Johnson K George, Principal Scientist, ICAR-IISR, Kozhikode for providing primers for osmotin and GAPDH.
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• The study was carried out in P. capsici susceptible (Sreekara) and resistant (04-P24, shows root resistance to the pathogen) black pepper lines.
• Differential expression of 3 PR gene - β-1,3-glucanase (PR–2), osmotin (PR-5) and cAPX (PR-9)- in response to P. capsici inoculation was studied here and cAPX gene was found to play vital role in P. capsici resistance in black pepper.
• In our previous paper published in the journal PMPP (Vandana et al. 2014), we elucidated the role of peroxidase in root resistance to P. capsici.
The above result was confirmed in this study revealing the role of cAPX in defense response to P. capsici.
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Vandana, V.V., Suseela Bhai, R. Differential expression of PR genes in response to Phytophthora capsici inoculation in resistant and susceptible black pepper (Piper nigrum L.) lines. Eur J Plant Pathol 150, 713–724 (2018). https://doi.org/10.1007/s10658-017-1319-1
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DOI: https://doi.org/10.1007/s10658-017-1319-1