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Chloroplast-Expressed MSI-99 in Tobacco Improves Disease Resistance and Displays Inhibitory Effect against Rice Blast Fungus
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Chloroplast-Expressed MSI-99 in Tobacco Improves Disease Resistance and Displays Inhibitory Effect against Rice Blast Fungus
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Journal Article
Chloroplast-Expressed MSI-99 in Tobacco Improves Disease Resistance and Displays Inhibitory Effect against Rice Blast Fungus
2015
Overview
Rice blast is a major destructive fungal disease that poses a serious threat to rice production and the improvement of blast resistance is critical to rice breeding. The antimicrobial peptide MSI-99 has been suggested as an antimicrobial peptide conferring resistance to bacterial and fungal diseases. Here, a vector harboring the MSI-99 gene was constructed and introduced into the tobacco chloroplast genome via particle bombardment. Transformed plants were obtained and verified to be homoplastomic by PCR and Southern hybridization. In planta assays demonstrated that the transgenic tobacco plants displayed an enhanced resistance to the fungal disease. The evaluation of the antimicrobial activity revealed that the crude protein extracts from the transgenic plants manifested an antimicrobial activity against E. coli, even after incubation at 120 °C for 20 min, indicating significant heat stability of MSI-99. More importantly, the MSI-99-containing protein extracts were firstly proved in vitro and in vivo to display significant suppressive effects on two rice blast isolates. These findings provide a strong basis for the development of new biopesticides to combat rice blast.
Publisher
MDPI AG,MDPI
Subject
/ Antimicrobial Cationic Peptides - genetics
/ Antimicrobial Cationic Peptides - metabolism
/ Antimicrobial Cationic Peptides - pharmacology
/ Disease Resistance - genetics
/ Escherichia coli - drug effects
/ Fungi
/ Host-Pathogen Interactions - drug effects
/ Plant Diseases - microbiology
/ Plants, Genetically Modified
/ Recombinant Proteins - genetics
/ Recombinant Proteins - metabolism
/ Recombinant Proteins - pharmacology
/ Rice
/ Tobacco
