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Riboflavin‐induced Priming for Pathogen Defense in Arabidopsis thaliana
Author(s) -
Zhang Shujian,
Yang Xue,
Sun Maowu,
Sun Feng,
Deng Sheng,
Dong Hansong
Publication year - 2009
Publication title -
journal of integrative plant biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.734
H-Index - 83
eISSN - 1744-7909
pISSN - 1672-9072
DOI - 10.1111/j.1744-7909.2008.00763.x
Subject(s) - callose , jasmonic acid , arabidopsis thaliana , pseudomonas syringae , biology , npr1 , plant defense against herbivory , hypersensitive response , arabidopsis , microbiology and biotechnology , signal transduction , abscisic acid , salicylic acid , plant disease resistance , priming (agriculture) , biotic stress , biochemistry , pathogen , botany , mutant , gene , abiotic stress , medicine , heart failure , germination , natriuretic peptide
Riboflavin (vitamin B 2 ) 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 H 2 O 2 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 H 2 O 2 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.