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Riboflavin-induced Priming for Pathogen Defense in Arabidopsis thaliana

Journal of Integrative Plant Biology 2009年第2期51卷 167-174页

作者： shujian zhang xue yang maowu sun feng sun sheng deng hansong dong Plant Growth and Defense Signafing Laboratory Group of Key Laboratory of Monitoring and Management of Plant Pathogens and Insect Pests Ministry of Agriculture Nanjing Agricultural University Nanjing 210095 China

Riboflavin （vitamin B2） participates in a variety of redox processes that affect plant defense responses. Previously we have shown that riboflavin induces pathogen resistance in the absence of hypersensitive cell death （HCD） in plants. Herein, we report that riboflavin induces priming of defense responses in Arabidopsis thaliana toward infection by virulent Pseudomonas syringae pv. tomato DC3000 （Pst）. Induced resistance was mechanistically connected with the expression of defense response genes and cellular defense events, including H202 burst, HCD, and callose deposition in the plant. Riboflavin treatment and inoculation of plants with Pst were neither active but both synergized to induce defense responses. The priming process needed NPRI （essential regulator of systemic acquired resistance） and maintenance of H202 burst but was independent of salicylic acid, jasmonic acid, ethylene, and abscisic acid. Our results suggest that the role of riboflavin in priming defenses is subject to a signaling process distinct from the known pathways of hormone signal transduction.

关键词： callose deposition defense responses hypersensitive cell death hydrogen peroxide priming riboflavin.

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Riboflavin-induced Priming for Pathogen Defense in Arabidopsis thaliana

Riboflavin-induced Priming for Pathogen Defense in Arabidops...

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中国植物病理学会2008年学术年会

作者： shujian zhang xue yang maowu sun feng sun sheng deng hansong dong College of Plant Protection, Nanjing Agricultural University, Nanjing 210095

Riboflavin (vitamin B) participates in a variety of redox processes that affect plant defense responses. Previously we have shown that riboflavin induces pathogen resistance in the absence of hypersensitive cell death (HCD) in plants. Herein, we report that riboflavin induces priming of defense responses in Arabidopsis thaliana toward infection by virulent Pseudomonas syringae pv. tomato DC3000 (Pst). Induced resistance was mechanistically connected with the expression of defense response genes and cellular defense events, including H202 burst, HCD, and callose deposition in the plant. Riboflavin treatment and inoculation of plants with Pst were neither active but both synergized to induce defense responses. The priming process needed NPR1 (essential regulator of systemic acquired resistance) and maintenance of HO burst but was independent of salicylic acid, jasmonic acid, ethylene, and abscisic acid. Our results suggest that the role of riboflavin in priming defenses is subject to signaling process distinct from the known pathways of hormone signal transduction.

关键词： riboflavin priming defense responses hypersensitive cell death (HCD) hydrogen peroxide(H2O2) callose deposition

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