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Contribution of both lignin content and sinapyl monomer to disease resistance in tobacco

As a major component of the cell wall, lignin has been suggested to play an important role in plant defense response to various pathogens. However, how lignin is involved in plant pathogen interaction is still unclear. Here, we cultivated a series of transgenic tobacco lines with a range of differences in lignin content and composition. Evaluation of pathogen resistance in these plants indicated that lower total lignin content aggravated the severity of tobacco black shank and bacterial wilt diseases, while increased sinapyl lignin (S) alleviated the disease symptoms. The regression analysis indicated both lignin content and S lignin were positive correlation with the disease resistance, particularly these two factors had additive effects and they exhibited the more strong correlation with disease resistance when they combined together. Neither guaiacyl lignin (G) nor S/G ratio showed close correlation with disease resistance. The expressions of pathogenesis-related protein genes PR2 and PR3 were induced after pathogen inoculation. But the up-regulation of PR2 and PR3 did not associated to disease resistance with lignin. These data collectively suggest that both total lignin content and S lignin are main factors that contribute to basic defense response in tobacco. 
 
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