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Comment
. 2010 Jul;5(7):872-4.
doi: 10.4161/psb.5.7.11899. Epub 2010 Jul 1.

Role of nitric oxide and reactive oxygen [corrected] species in disease resistance to necrotrophic pathogens

Shuta Asai  1 , Keisuke Mase, Hirofumi Yoshioka
Affiliations
Comment

Role of nitric oxide and reactive oxygen [corrected] species in disease resistance to necrotrophic pathogens

Shuta Asai et al. Plant Signal Behav. 2010 Jul.

Erratum in

  • Plant Signal Behav. 2012 Oct 1;7(10):2012

Abstract

Nitric oxide (NO) and reactive oxygen species (ROS) are important signaling molecules in plant immunity. However, roles of NO and ROS in disease resistance to necrotrophic pathogens are not fully understood. We have recently demonstrated that NO plays a pivotal role in basal defense against Botrytis cinerea and the expression of the salicylic acid (SA) -responsive gene PR-1in Nicotiana benthamiana. By contrast, ROS function negatively in resistance or positively in expansion of disease lesions during B. cinerea-N. benthamiana interaction. Here, analysis in NahG-transgenic N. benthamiana showed that SA signaling is not involved in resistance to B. cinerea in N. benthamiana. We discuss how NO and ROS participate in disease resistance to necrotrophic pathogens on the basis of recent reports.

Keywords: MAPK; NO burst; necrotrophic pathogen; oxidative burst; plant immunity; salicylic acid.

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Figures

Figure 1
Figure 1
Effects of NahG transgene on susceptibility to B. cinerea. NahG and non-NahG (WT) leaves were inoculated with B. cinerea conidial suspension (1 × 105 conidia/ml). (A) Inoculated leaves were photographed at 4 days postinoculation (dpi). (B) Average diameter of lesions formed on the leaves at 3 and 4 dpi. Data are means ± SD from fourteen experiments.
Figure 2
Figure 2
Effects of silencing NbNOA1 (N), NbRBOHB (B) or NbNOA1/NbRBOHB (N/B) in NahG plants on susceptibility to B. cinerea. Silenced NahG leaves were inoculated with B. cinerea conidial suspension (1 × 105 conidia/ml). (A) Inoculated leaves were photographed at 4 dpi. (B) Average diameter of lesions formed on the leaves at 3 and 4 dpi. Data are means ± SD from four experiments. Data were subjected to Student's t-test. *p < 0.05 versus silencing-control plants (TRV). **p < 0.05 versus NbRBOHB-silenced plants.
Figure 3
Figure 3
Model showing role of NO and oxidative bursts in disease resistance to necrotrophic pathogens. After recognition of necrotrophs, plants immediately provoke activation of MAPK which could regulate production of both NO and ROS, and then NO and oxidative bursts. NO burst plays an important role in disease resistance to necrotrophic pathogens, whereas oxidative burst has a negative role in resistance or has a positive role in expansion of disease lesions by necrotrophs.
See this image and copyright information in PMC

Comment on

References

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