Induction of Systemic Acquired Resistance in Papaya by Foliar Application of HrpN Recombinant Protein for Increased Resistance against Papaya Dieback Pathogen
Journal Title: Current Investigations in Agriculture and Current Research - Year 2018, Vol 2, Issue 3
Abstract
Plants are continuously exposed to undesirable pest and pathogen threats. In response, plants have developed numerous mechanisms to protect themselves against the pathogens. Systemic acquired resistance (SAR) is an inducible disease resistance response in plant species. It is found in a large range of plant species including papaya and characterized by broad spectrum disease control and an associated coordinated expression of a set of pathogenesis related (PR) genes and proteins which are also known as SAR markers. Expression and purification of HrpN from Erwinia mallotivora, the causal agent of papaya dieback, was carried out. In this report, HrpN recombinant protein was tested and characterized for its effect and potential as elicitor that can increase papaya defence against E. mallotivora through the activation of SAR mechanism. Based on disease severity analysis, control plants which were untreated, showed faster disease infection rate and severity when compared to the recombinant protein treated plants. Increased resistance towards the papaya dieback pathogen was shown to be associated with increased expression of selected plant defined genes using quantitative Real Time analysis which were observed after the papaya was sprayed with the recombinant HrpN protein. Based on physiological and molecular analysis, the selected protein has induced SAR; increased selected SAR associated defence gene expression and increased the papaya resistance against the papaya dieback pathogen.Papaya is a popular and commercially available fruit in the tropical and subtropical regions. It is highly known not only for its nutritious quality but also for its medicinal functions [1]. During its prime time, Eksotika, Sekaki and Solo were the Malaysia’s flagship varieties for export with an export value of about RM100–120 million per year, a total volume of 58,149 mt which accounted for 21% of the global trade in 2004 [2,3]. Papaya dieback disease caused by Erwinia mallotivora is the main cause for the rapid decline of Malaysian papaya production, amounting to 60% decrease in papaya production [4,5]. When attacked by pathogen, plants defend themselves through activation of plant defence mechanism which includes oxidative burst of cells, alteration in cell wall composition and de-novo synthesis of compounds like phytoalexin and elevated expression of pathogenesis-related (PR) proteins
Authors and Affiliations
Norliza Abu Bakar, Zulfadli Sohaime Mohd, Nor Mustaiqazah Juri, Rafidah Badrun, Johari Sarip
Keywords
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- EP ID EP570355
- DOI 10.32474/CIACR.2018.02.000136
- Views 80
- Downloads 0
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