Abstract
Salicylic acid (SA) is an important phytohormone that plays a vital role in a number of physiological responses, including plant defense. The last two decades have witnessed a number of breakthroughs related to biosynthesis, transport, perception and signaling mediated by SA. These findings demonstrate that SA plays a crictical role in both local and systemic defense responses. Systemic acquired resistance (SAR) is one such SA-dependent response. SAR is a long distance signaling mechanism that provides broad spectrum and long-lasting resistance to secondary infections throughout the plant. This unique feature makes SAR a highly desirable trait in crop production. This review summarizes the recent advances in the role of SA in SAR and discusses its relationship to other SAR inducers.
Highlights
Plants being sessile are constantly exposed to a number of pathogenic microbes, which based on their infectious lifestyles can be broadly divided into biotrophs and necrotrophs (Glazebrook, 2005; Mengiste, 2012; Lai and Mengiste, 2013)
Recent work on Systemic acquired resistance (SAR) has identified a number of chemical and protein signals and placed them in a common pathway that comprises at least two parallel branches (Figure 2)
These studies indicate the involvement of additional unknown signal(s) that function upstream of the branchpoint separating Salicylic acid (SA)-NPR1- and nitric oxide (NO)-ROSAzA-G3P-derived pathways
Summary
Plants being sessile are constantly exposed to a number of pathogenic microbes, which based on their infectious lifestyles can be broadly divided into biotrophs and necrotrophs (Glazebrook, 2005; Mengiste, 2012; Lai and Mengiste, 2013). Induction of local responses is associated with the transport of defense signals throughout the plant resulting in broad-spectrum disease resistance against secondary infections This phenomenon, known as systemic acquired resistance (SAR), is conserved among diverse. A mutation in ICS1 impairs SAR (Wildermuth et al, 2001; Jung et al, 2009; Chanda et al, 2011; Wang et al, 2014a), suggesting that SA contributed by both PALand ICS-pathways is critical for the induction and/or establishment of SAR This together with the compromised SAR phenotype of transgenic plants expressing bacterial salicylate hydroxylase (NahG; Vernooij et al, 1994), an enzyme that catalyzes the conversion of SA to catechol, reemphasize the importance. The role of light signaling in SAR and how it might compensate for MeSA
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
