Visible foliar injury and infrared imaging show that daylength affects short-term recovery after ozone stress in Trifolium subterraneum

Vollsnes, Ane V.; Eriksen, Aud Berglen; Otterholt, Eli; Kvaal, Knut; Oxaal, Unni; Futsæther, Cecilia Marie

doi:10.1093/jxb/erp213

Cited by 37 publications

(25 citation statements)

References 39 publications

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“…While this remains an intriguing possibility, our previous analyses suggest that the conditionality of lesion formation in cat2 is partly linked to daylength perception independent of the duration of exposure to H 2 O 2 . Consistent with this explanation, it has recently been reported that longer daylengths increase leaf injury induced by equal-time ozone exposures (Vollsnes et al, 2009). Because there is evidence for overlap between SA, pathogen responses, and the regulation of flowering (Martínez et al, 2004), the requirement for LD-dependent SA accumulation in cat2 may reflect the coordination of H 2 O 2 -triggered lesions with the flowering program.…”

Section: Peroxisomal H 2 O 2 Induces Biotic Defense Response Markers supporting

confidence: 58%

Peroxisomal Hydrogen Peroxide Is Coupled to Biotic Defense Responses by ISOCHORISMATE SYNTHASE1 in a Daylength-Related Manner

et al. 2010

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While it is well established that reactive oxygen species can induce cell death, intracellularly generated oxidative stress does not induce lesions in the Arabidopsis (Arabidopsis thaliana) photorespiratory mutant cat2 when plants are grown in short days (SD). One interpretation of this observation is that a function necessary to couple peroxisomal hydrogen peroxide (H 2 O 2 )-triggered oxidative stress to cell death is only operative in long days (LD). Like lesion formation, pathogenesis-related genes and camalexin were only induced in cat2 in LD, despite less severe intracellular redox perturbation compared with SD. Lesion formation triggered by peroxisomal H 2 O 2 was modified by introducing secondary mutations into the cat2 background and was completely absent in cat2 sid2 double mutants, in which ISOCHORISMATE SYNTHASE1 (ICS1) activity is defective. In addition to H 2 O 2 -induced salicylic acid (SA) accumulation, the sid2 mutation in ICS1 abolished a range of LD-dependent pathogen responses in cat2, while supplementation of cat2 with SA in SD activated these responses. Nontargeted transcript and metabolite profiling identified clusters of genes and small molecules associated with the daylength-dependent ICS1-mediated relay of H 2 O 2 signaling. The effect of oxidative stress in cat2 on resistance to biotic challenge was dependent on both growth daylength and ICS1. We conclude that (1) lesions induced by intracellular oxidative stress originating in the peroxisomes can be genetically reverted; (2) the isochorismate pathway of SA synthesis couples intracellular oxidative stress to cell death and associated disease resistance responses; and (3) camalexin accumulation was strictly dependent on the simultaneous presence of both H 2 O 2 and SA signals.

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Section: Peroxisomal H 2 O 2 Induces Biotic Defense Response Markers supporting

confidence: 58%

Peroxisomal Hydrogen Peroxide Is Coupled to Biotic Defense Responses by ISOCHORISMATE SYNTHASE1 in a Daylength-Related Manner

et al. 2010

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“…Because daylengthdependent effects have been described for redox signaling during pathogen and oxidative stress responses (Dietrich et al, 1994;Karpinski et al, 2003;Vollsnes et al, 2009), we analyzed the importance of GR1 in Col-0 and cat2 backgrounds in two growth daylengths.…”

Section: Gr1 Plays a Nonredundant Role In H 2 O 2 Metabolism And Signmentioning

confidence: 99%

Arabidopsis GLUTATHIONE REDUCTASE1 Plays a Crucial Role in Leaf Responses to Intracellular Hydrogen Peroxide and in Ensuring Appropriate Gene Expression through Both Salicylic Acid and Jasmonic Acid Signaling Pathways

et al. 2010

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Glutathione is a major cellular thiol that is maintained in the reduced state by glutathione reductase (GR), which is encoded by two genes in Arabidopsis (Arabidopsis thaliana; GR1 and GR2). This study addressed the role of GR1 in hydrogen peroxide (H 2 O 2 ) responses through a combined genetic, transcriptomic, and redox profiling approach. To identify the potential role of changes in glutathione status in H 2 O 2 signaling, gr1 mutants, which show a constitutive increase in oxidized glutathione (GSSG), were compared with a catalase-deficient background (cat2), in which GSSG accumulation is conditionally driven by H 2 O 2 . Parallel transcriptomics analysis of gr1 and cat2 identified overlapping gene expression profiles that in both lines were dependent on growth daylength. Overlapping genes included phytohormone-associated genes, in particular implicating glutathione oxidation state in the regulation of jasmonic acid signaling. Direct analysis of H 2 O 2 -glutathione interactions in cat2 gr1 double mutants established that GR1-dependent glutathione status is required for multiple responses to increased H 2 O 2 availability, including limitation of lesion formation, accumulation of salicylic acid, induction of pathogenesis-related genes, and signaling through jasmonic acid pathways. Modulation of these responses in cat2 gr1 was linked to dramatic GSSG accumulation and modified expression of specific glutaredoxins and glutathione S-transferases, but there is little or no evidence of generalized oxidative stress or changes in thioredoxin-associated gene expression. We conclude that GR1 plays a crucial role in daylength-dependent redox signaling and that this function cannot be replaced by the second Arabidopsis GR gene or by thiol systems such as the thioredoxin system.

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“…Thermal images were obtained using a Thermovision A20 infrared camera (FLIR Systems, USA) according to VOLLSNES et al (2009). The infrared camera was mounted vertically ~10 cm above the leaf.…”

Section: Thermal Imagingmentioning

confidence: 99%

Leaf Rolling Reduces Photosynthetic Loss in Maize Under Severe Drought

Sağlam¹,

Kadıoğlu²,

Demiralay³

et al. 2014

Acta Botanica Croatica

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-Effects of leaf rolling (LR) on maize photosynthesis under severe drought stress were studied in two cultivars with opposite drought responses, Batem 56-55 (drought tolerant) and Batem 51-52 (drought sensitive). Drought stress and artifi cial prevention of leaf rolling (PLR) were applied at grain fi lling stage for 30 days. LR in Batem 56-55 occurred later than in Batem 51-52. Leaf water potential (Ψ leaf ) did not change in Batem 56-55 but decreased in Batem 51-52 at LR. Maximum quantum yield of photosystem II (F v /F m ), effective quantum yield of photosystem II (Φ PSII ) and electron transport rate (ETR) of the cultivars decreased during LR more signifi cantly in Batem 56-55 in comparison to Batem 51-52. The same was observed for the decrease in net photosynthetic rate (P N ), stomatal conductance (g s ), transpiration (E) and intracellular level of CO 2 (C i ). Rubisco activity and content were reduced at LR, but were less affected in Batem 56-55 than in Batem 51-52. Ear and kernel weights also decreased at LR. All parameters at PLR were more reduced than those of LR. These results implied that LR was an important and necessary mechanism protecting photosynthesis and reducing yield loss under drought stress by maintaining the leaf hydration, preventing loss of the photosynthetic pigments, sustaining the activity of PSII, keeping the stomata open, and conserving the activity of Rubisco.

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Visible foliar injury and infrared imaging show that daylength affects short-term recovery after ozone stress in Trifolium subterraneum

Cited by 37 publications

References 39 publications

Peroxisomal Hydrogen Peroxide Is Coupled to Biotic Defense Responses by ISOCHORISMATE SYNTHASE1 in a Daylength-Related Manner

Peroxisomal Hydrogen Peroxide Is Coupled to Biotic Defense Responses by ISOCHORISMATE SYNTHASE1 in a Daylength-Related Manner

Arabidopsis GLUTATHIONE REDUCTASE1 Plays a Crucial Role in Leaf Responses to Intracellular Hydrogen Peroxide and in Ensuring Appropriate Gene Expression through Both Salicylic Acid and Jasmonic Acid Signaling Pathways

Leaf Rolling Reduces Photosynthetic Loss in Maize Under Severe Drought

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