Interplay between Plant Cell Walls and Jasmonate Production

Mielke, Stefan; Gasperini, Debora

doi:10.1093/pcp/pcz119

Cited by 24 publications

(21 citation statements)

References 76 publications

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“…Notably, chemical or genetic inhibition of cellulose biosynthesis by isoxaben application or by mutations in CELLULOSE SYNTHASE (CesA) genes leads to increased JA-Ile levels, eg. (11,13,14). Consistently, mutations in KORRIGAN1 (KOR1), a CesA-interacting membrane protein with endo-1,4-beta-Dglucanase activity involved in cellulose biosynthesis, exhibits a slight basal increase in the JA-Ile precursor JA (15)(16)(17)(18)(19).…”

Section: Introductionmentioning

confidence: 75%

“…JA responses can be triggered by exogenous treatment with specific pectin-and cellulose-derived fragments serving as ligands binding putative plasma membrane receptors and activating intracellular signalling, reviewed in (11). More notoriously, JA-Ile biosynthesis is swiftly activated by mechanical stress (24).…”

Section: Osmotic Support Abolishes Constitutive Ja Production In Kor1mentioning

confidence: 99%

“…Several molecular elicitors of JA-Ile biosynthesis have been proposed, including herbivore-, microbe-, and damage-associated molecular patterns generated during environmental stresses. These elicitors would be recognized by putative pattern recognition receptors at the cell surface that transduce the signal intracellularly and initiate de novo JA-Ile synthesis, reviewed in (9,11). However, conclusive genetic evidence for ligand-based induction of JA-Ile biosynthesis is still missing.…”

Section: Introductionmentioning

confidence: 99%

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Jasmonate biosynthesis arising from altered cell walls is prompted by turgor-driven mechanical compression and guides root hydrotropism

Mielke

Zimmer

Dreos

et al. 2020

Preprint

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Despite the vital roles of jasmonoyl-isoleucine (JA-Ile) in governing plant growth and environmental acclimation, it remains unclear what intracellular processes lead to its induction. Here, we provide compelling genetic evidence that mechanical and osmotic regulation of turgor pressure represents a key factor in eliciting JA-Ile biosynthesis. After identifying cell wall mutant alleles in KORRIGAN1 (KOR1) with elevated JA-Ile in seedling roots, we found that ectopic JA-Ile resulted from cell non-autonomous signals deriving from enlarged cortex cells compressing inner tissues and stimulating JA-Ile production. Restoring cortex cell size by cell-type-specific KOR1 complementation, by isolating a genetic kor1 suppressor, and by lowering turgor pressure with hyperosmotic treatments, abolished JA-Ile signalling. Strikingly, heightened JA-Ile levels guided kor1 roots towards greater water availability, uncovering a previously unrecognized JA-Ile function in root hydrotropism. Collectively, these findings enhance our understanding of JA-Ile biosynthesis initiation, and reveal a novel role of JA-Ile in orchestrating environmental resilience.

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Section: Introductionmentioning

confidence: 75%

Section: Osmotic Support Abolishes Constitutive Ja Production In Kor1mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Jasmonate biosynthesis arising from altered cell walls is prompted by turgor-driven mechanical compression and guides root hydrotropism

Mielke

Zimmer

Dreos

et al. 2020

Preprint

Self Cite

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“…In addition, the degradation of this cross-linked homogalacturan by polygalacturonases (Bellincampi et al, 2014; Sénéchal et al, 2014), would result in the formation of Ca 2+ cross-linked oligogalacturonides, which elicit strong biological responses such as production of ROS, phytoalexins, callose and JA-Ile production (Kohorn and Kohorn, 2012; Bethke et al, 2014; Savatin et al, 2014; Mielke and Gasperini, 2019).…”

Section: Discussionmentioning

confidence: 99%

The cell-wall-localised BETA-XYLOSIDASE 4 contributes to immunity of Arabidopsis against Botrytis cinerea

Guzha

McGee

Hartken

et al. 2019

Preprint

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One-sentence summary:BXL4 is a putative bifunctional 23 xylosidase/arabinofuranisodase localising to the apoplast, important for immunity 24 against the necrotrphic pathogen B. cinerea. 25 2 ABSTRACT 26 Plant cell walls constitute physical barriers that restrict access of microbial 27 pathogens to the contents of plant cells. The primary cell wall of multicellular 28 plants predominantly consists of cellulose, hemicellulose and pectin. In 29 Arabidopsis, a cell wall-localised protein, BETA-XYLOSIDASE 4 (BXL4) that 30 belongs to a seven-member BETA-XYLOSIDASE (BXL) gene family was induced 31 upon infection with the necrotrophic fungal pathogen Botrytis cinerea and 32 mechanical wounding in a jasmonoyl isoleucine (JA-Ile) dependent manner. 33 Ectopic expression of the BXL4 gene in Arabidopsis seed coat epidermal cells 34 was able to rescue a bxl1 mutant phenotype suggesting that like BXL1, BXL4, 35 had both xylosidase and arabinosidase activity and acts in mura on cell wall 36 polysaccharides. bxl4 mutants show a compromised resistance to B. cinerea. 37 Upon infection, bxl4 mutants accumulated reduced levels of JA-Ile and 38 camalexin. Conditional overexpression of BXL4 resulted in enhanced 39 expression of PDF1.2 and PAD3 transcripts both before and after B. cinerea 40 infection. This was associated with reduced susceptibility of the transgenic lines 41 to B. cinerea. These data suggest that remodelling or degradation of one or more 42 cell wall polysaccharides is important for plant immunity against B. cinerea and 43 plays a role in pathogen-induced JA-Ile and camalexin accumulation. 44 45 48 evolved various inducible and constitutive defence mechanisms against the different 49 biotic and abiotic perturbations (Schutzendubel and Polle, 2002; Jones and Dangl, 50

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“…These important effectors of growth, development and senescence are described in detail in a later chapter ('Jasmonates'). Some recent updates on jasmonate functions can be found in a special edition of Plant and Cell Physiology [101][102][103][104][105][106].…”

Section: Plant Oxylipinsmentioning

confidence: 99%

Oxidation of polyunsaturated fatty acids to produce lipid mediators

Christie

Harwood

2020

Essays in Biochemistry

150

102

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Abstract The chemistry, biochemistry, pharmacology and molecular biology of oxylipins (defined as a family of oxygenated natural products that are formed from unsaturated fatty acids by pathways involving at least one step of dioxygen-dependent oxidation) are complex and occasionally contradictory subjects that continue to develop at an extraordinarily rapid rate. The term includes docosanoids (e.g. protectins, resolvins and maresins, or specialized pro-resolving mediators), eicosanoids and octadecanoids and plant oxylipins, which are derived from either the omega-6 (n-6) or the omega-3 (n-3) families of polyunsaturated fatty acids. For example, the term eicosanoid is used to embrace those biologically active lipid mediators that are derived from C20 fatty acids, and include prostaglandins, thromboxanes, leukotrienes, hydroxyeicosatetraenoic acids and related oxygenated derivatives. The key enzymes for the production of prostanoids are prostaglandin endoperoxide H synthases (cyclo-oxygenases), while lipoxygenases and oxidases of the cytochrome P450 family produce numerous other metabolites. In plants, the lipoxygenase pathway from C18 polyunsaturated fatty acids yields a variety of important products, especially the jasmonates, which have some comparable structural features and functions. Related oxylipins are produced by non-enzymic means (isoprostanes), while fatty acid esters of hydroxy fatty acids (FAHFA) are now being considered together with the oxylipins from a functional perspective. In all kingdoms of life, oxylipins usually act as lipid mediators through specific receptors, have short half-lives and have functions in innumerable biological contexts.

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Interplay between Plant Cell Walls and Jasmonate Production

Cited by 24 publications

References 76 publications

Jasmonate biosynthesis arising from altered cell walls is prompted by turgor-driven mechanical compression and guides root hydrotropism

Jasmonate biosynthesis arising from altered cell walls is prompted by turgor-driven mechanical compression and guides root hydrotropism

The cell-wall-localised BETA-XYLOSIDASE 4 contributes to immunity of Arabidopsis against Botrytis cinerea

Oxidation of polyunsaturated fatty acids to produce lipid mediators

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