Involvement of salicylate and jasmonate signaling pathways in Arabidopsis interaction with Fusarium graminearum.
Ragiba Makandar,Vamsi J. Nalam,Ratnesh Chaturvedi,Richard Jeannotte,Alexis A. Sparks,Jyoti Shah +5 more
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Genetic and biochemical experiments indicate that the JA pathway promotes disease by attenuating the activation of SA signaling in fungus-inoculated plants, but the hypersusceptibility of the jar1 npr1 double mutant compared with the nPR1 mutant suggests that JAR1 also contributes to defense, signifying a dichotomous role of JA and a JAR2-dependent mechanism in this interaction.Abstract:
Fusarium graminearum is the principal causative agent of Fusarium head blight (FHB), a devastating disease of wheat and barley. This fungus can also colonize Arabidopsis thaliana. Disease resistance was enhanced in transgenic wheat and Arabidopsis plants that constitutively overexpress the NONEXPRESSOR OF PATHOGENESIS-RELATED GENES 1 (NPR1) gene, which regulates salicylic acid (SA) signaling and modulates the activation of jasmonic acid (JA)-dependent defenses. Here, we provide several lines of evidence that reveal an important role for SA and JA signaling in Arabidopsis defense against F. graminearum. SA level was elevated in fungus-inoculated leaves, and SA application and biologically activated systemic acquired resistance enhanced resistance. Furthermore, the disruption of SA accumulation and signaling in the sid2 mutant and NahG transgenic plant, and the npr1 and wrky18 mutants, respectively, resulted in heightened susceptibility to this fungus in leaves and inflorescence. JA signaling was activated in parallel with SA signaling in the fungus-challenged plants. However, the hyperresistance of the JA pathway mutants opr3, coi1, and jar1 indicates that this pathway contributes to susceptibility. Genetic and biochemical experiments indicate that the JA pathway promotes disease by attenuating the activation of SA signaling in fungus-inoculated plants. However, the hypersusceptibility of the jar1 npr1 double mutant compared with the npr1 mutant suggests that JAR1 also contributes to defense, signifying a dichotomous role of JA and a JAR1-dependent mechanism in this interaction.read more
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Resistance to hemi-biotrophic F. graminearum infection is associated with coordinated and ordered expression of diverse defense signaling pathways.
Lina Ding,Haibin Xu,Hongying Yi,Liming Yang,Zhongxin Kong,Lixia Zhang,Shulin Xue,Haiyan Jia,Zhengqiang Ma +8 more
TL;DR: This study compared the time-course expression profiles between FHB-resistant Wangshuibai plants and susceptible Meh0106 mutant plants of a selected set of genes that are critical to the plants' resistance and defense reactions and provided important clues for designing strategies to curb diseases caused by Fusarium.
Journal ArticleDOI
On the trail of a cereal killer: recent advances in Fusarium graminearum pathogenomics and host resistance
TL;DR: In the last few years, significant progress has been made towards a better understanding of the processes involved in F. graminearum pathogenesis, toxin biosynthesis and host resistance mechanisms through the use of high-throughput genomic and phenomic technologies.
Journal ArticleDOI
A wheat WRKY transcription factor TaWRKY10 confers tolerance to multiple abiotic stresses in transgenic tobacco.
Chen Wang,Pengyi Deng,Liulin Chen,Xiatian Wang,Hui Ma,Wei Hu,Ningcong Yao,Ying Feng,Ruihong Chai,Guangxiao Yang,Guangyuan He +10 more
TL;DR: Overexpression of TaWRKY10 in tobacco resulted in enhanced drought and salt stress tolerance, mainly demonstrated by the transgenic plants exhibiting of increased germination rate, root length, survival rate and relative water content under these stress conditions.
Journal ArticleDOI
An abietane diterpenoid is a potent activator of systemic acquired resistance.
Ratnesh Chaturvedi,Barney J. Venables,Robby A. Petros,Vamsi J. Nalam,Maoyin Li,Maoyin Li,Xuemin Wang,Xuemin Wang,Larry J. Takemoto,Jyoti Shah +9 more
TL;DR: Dehydroabietinal (DA), an abietane diterpenoid, is an activator of systemic acquired resistance (SAR), which is an inducible defense mechanism that is activated in the distal, non-colonized, organs of a plant that has experienced a local foliar infection.
Journal ArticleDOI
Crosstalk among Jasmonate, Salicylate and Ethylene Signaling Pathways in Plant Disease and Immune Responses.
TL;DR: Phytohormone crosstalk is crucial for plant defenses against pathogens and insects in which salicylic acid, jasmonic acid, and ethylene play key roles as well as their synergistic and antagonistic interaction in plant disease and immune responses.
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TL;DR: This chapter discusses techniques for Growing and Identifying Fusarium, and concludes with a discussion of the importance of knowing the carrier and removal status of canine coronavirus in the context of fusarium establishment.
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Systemic acquired resistance
W.E. Durrant,Xinnian Dong +1 more
TL;DR: A model describing the sequence of events leading from initial infection to the induction of defense genes is presented and exciting new data suggest that the mobile signal for SAR might be a lipid molecule.