Plant Immunity in Signaling Crosstalk between Biotic and Abiotic Stress Responses

A special issue of Plants (ISSN 2223-7747). This special issue belongs to the section "Plant Protection and Biotic Interactions".

Deadline for manuscript submissions: closed (31 May 2024) | Viewed by 3610

Special Issue Editors


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Guest Editor
MED - Mediterranean Institute for Agriculture, Environment and Development & CHANGE - Global Change and Sustainability Institute, Universidade de Évora, 7006-554 Évora, Portugal
Interests: gene expression analysis; single-cell analysis; biotic and abiotic stress responses; auxin and ros pathways; plant immunity; plant protection

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Guest Editor
INSIBIO (CONICET-UNT), Department of Biochemistry, Universidad Nacional de Tucumán, Chacabuco 461, San Miguel de Tucumán T4000ILI, Argentina
Interests: integrated agriculture; defense elicitor; defense response; innate immunity; biotic stress; abiotic stress; beneficial microorganisms; bio-inputs. biocontrol; disease tolerance; growth enhancers
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Special Issue Information

Dear Colleagues,

We are pleased to announce this Special Issue, relating to plant immunity in signaling crosstalk between biotic and abiotic stress responses. As we know, plants will experience many attacks from a fluctuating environment, such as plant pathogens and abiotic factors, which includes light, temperature, water and nutrients. Plants have evolved to have strong immune systems to accommodate adverse conditions; they utilize many cell surface and intracellular immune receptors to sense various immunogenic signals associated with pathogen infection and subsequently activate their defenses. The beneficial microorganisms also play an important role in plant adaptation to adverse environmental factors. Therefore, studying the molecular basis of plant–microbial–environment interaction will have profound significance in plant science. In addition, as individual stress signaling pathways have progressed, recent studies have begun to reveal the molecular crosstalk between biotic and abiotic stress responses and the regulatory mechanisms in integrating stress responses.

Finally, this Special Issue will consider papers from signaling pathways of the plant defense response to biotic and abiotic stress, environmental effects on plant immunity, molecular mechanisms of plant immunity, and plant and beneficial microorganisms interactions.

Dr. Isabel Velada
Prof. Dr. Juan Carlos Díaz-Ricci
Guest Editors

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Keywords

  • plant immunity
  • pathogen defense signaling
  • innate immunity
  • plant defenses
  • beneficial microorganisms
  • effectors
  • immune receptors

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Published Papers (2 papers)

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Research

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17 pages, 3247 KiB  
Article
Arabidopsis TGA256 Transcription Factors Suppress Salicylic-Acid-Induced Sucrose Starvation
by Matthew E. Bergman, Sonia E. Evans, Xiahezi Kuai, Anya E. Franks, Charles Despres and Michael A. Phillips
Plants 2023, 12(18), 3284; https://doi.org/10.3390/plants12183284 - 16 Sep 2023
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Abstract
Salicylic acid (SA) is produced by plants in response to pathogen infection. SA binds the NONEXPRESSOR OF PATHOGENESIS-RELATED GENES (NPR) family of receptors to regulate both positive (NPR1) and negative (NPR3/4) plant immune responses by interacting with the clade II TGACG (TGA) motif-binding [...] Read more.
Salicylic acid (SA) is produced by plants in response to pathogen infection. SA binds the NONEXPRESSOR OF PATHOGENESIS-RELATED GENES (NPR) family of receptors to regulate both positive (NPR1) and negative (NPR3/4) plant immune responses by interacting with the clade II TGACG (TGA) motif-binding transcription factors (TGA2, TGA5, and TGA6). Here, we report that the principal metabolome-level response to SA treatment in Arabidopsis is a reduction in sucrose and other free sugars. We observed nearly identical effects in the tga256 triple mutant, which lacks all clade II TGA transcription factors. The tga256 mutant presents reduced leaf blade development and elongated hypocotyls, roots, and petioles consistent with sucrose starvation. No changes were detected in auxin levels, and mutant seedling growth could be restored to that of wild-type by sucrose supplementation. Although the retrograde signal 2-C-methyl-D-erythritol-2,4-cyclodiphosphate is known to stimulate SA biosynthesis and defense signaling, we detected no negative feedback by SA on this or any other intermediate of the 2-C-methyl-D-erythritol-4-phosphate pathway. Trehalose, a proxy for the sucrose regulator trehalose-6-phosphate (T6P), was highly reduced in tga256, suggesting that defense-related reductions in sugar availability may be controlled by changes in T6P levels. We conclude that the negative regulatory roles of TGA2/5/6 include maintaining sucrose levels in healthy plants. Disruption of TGA2/5/6-NPR3/4 inhibitory complexes by mutation or SA triggers sucrose reductions in Arabidopsis leaves, consistent with the ‘pathogen starvation’ hypothesis. These findings highlight sucrose availability as a mechanism by which TGA2/5/6 balance defense and development. Full article
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Review

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20 pages, 2275 KiB  
Review
New Insights into the Connections between Flooding/Hypoxia Response and Plant Defenses against Pathogens
by Pablo García, Shreenivas Singh and Emmanuelle Graciet
Plants 2024, 13(16), 2176; https://doi.org/10.3390/plants13162176 - 6 Aug 2024
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Abstract
The impact of global climate change has highlighted the need for a better understanding of how plants respond to multiple simultaneous or sequential stresses, not only to gain fundamental knowledge of how plants integrate signals and mount a coordinated response to stresses but [...] Read more.
The impact of global climate change has highlighted the need for a better understanding of how plants respond to multiple simultaneous or sequential stresses, not only to gain fundamental knowledge of how plants integrate signals and mount a coordinated response to stresses but also for applications to improve crop resilience to environmental stresses. In recent years, there has been a stronger emphasis on understanding how plants integrate stresses and the molecular mechanisms underlying the crosstalk between the signaling pathways and transcriptional programs that underpin plant responses to multiple stresses. The combination of flooding (or resulting hypoxic stress) with pathogen infection is particularly relevant due to the frequent co-occurrence of both stresses in nature. This review focuses on (i) experimental approaches and challenges associated with the study of combined and sequential flooding/hypoxia and pathogen infection, (ii) how flooding (or resulting hypoxic stress) influences plant immunity and defense responses to pathogens, and (iii) how flooding contributes to shaping the soil microbiome and is linked to plants’ ability to fight pathogen infection. Full article
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