Jasmonates: what ALLENE OXIDE SYNTHASE does for plants

Farmer, Edward E.; Goossens, Alain

doi:10.1093/jxb/erz254

Cited by 50 publications

(34 citation statements)

References 32 publications

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“…Arabidopsis plants expressing the CcAOS transcript are distinguished by its higher growth rate, smaller siliques and lower number of seeds when compared with their WT counterparts. As previously reported by Farmer and Goossens ( 2019 ), higher basal level of JA due to an upregulation of CcAOS, resulted in plants with higher growth rate, a mechanism that could also be occurring in our heterologous lines. Interestingly, Kubigsteltig and Weiler ( 2003 ) obtained several Arabidopsis lines affected in the transcriptional control of AOS and, from eight lines showing constitutive AOS expression, all showed signs of growth inhibition, suggesting a different role for CcAOS which may account for the resistance exhibited by C. crenata .…”

Section: Discussionsupporting

confidence: 77%

“…In leaves, JAZ10 expression showed opposite regulation, in phase with the upregulation of AOS at the same time-point (24 h.a.i.). Leaves are directly exposed to light and, under such conditions, the JA pathway is highly inducible, with a higher expression of AOS that leads to biologically active jasmonoyl-isoleucine (JA-Ile) production (Farmer and Goossens, 2019 ). The availability of JA-Ile stimulates the fine modulation of the JA signaling (e.g., by JAZ10) which could promote growth and recovery from an infection scenario, giving the plant a chance of reproduction (Guo et al, 2018 ; Farmer and Goossens, 2019 ).…”

Section: Discussionmentioning

confidence: 99%

“…Leaves are directly exposed to light and, under such conditions, the JA pathway is highly inducible, with a higher expression of AOS that leads to biologically active jasmonoyl-isoleucine (JA-Ile) production (Farmer and Goossens, 2019 ). The availability of JA-Ile stimulates the fine modulation of the JA signaling (e.g., by JAZ10) which could promote growth and recovery from an infection scenario, giving the plant a chance of reproduction (Guo et al, 2018 ; Farmer and Goossens, 2019 ). JAZ proteins, through immunity-repression of JA pathway, promote growth to limit carbon starvation associated with strong defense responses and enable reproduction (Guo et al, 2018 ).…”

Section: Discussionmentioning

confidence: 99%

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Expression of Castanea crenata Allene Oxide Synthase in Arabidopsis Improves the Defense to Phytophthora cinnamomi

et al. 2021

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Allene oxide synthase (AOS) is a key enzyme of the jasmonic acid (JA) signaling pathway. The AOS gene was previously found to be upregulated in an Asian chestnut species resistant to infection by the oomycete Phytophthora cinnamomi (Castanea crenata), while lower expression values were detected in the susceptible European chestnut (Castanea sativa). Here, we report a genetic and functional characterization of the C. crenata AOS (CcAOS) upon its heterologous gene expression in a susceptible ecotype of Arabidopsis thaliana, which contains a single AOS gene. It was found that Arabidopsis plants expressing CcAOS delay pathogen progression and exhibit more vigorous growth in its presence. They also show upregulation of jasmonic acid and salicylic acid-related genes. As in its native species, heterologous CcAOS localized to plastids, as revealed by confocal imaging of the CcAOS-eGFP fusion protein in transgenic Arabidopsis roots. This observation was confirmed upon transient expression in Nicotiana benthamiana leaf epidermal cells. To further confirm a specific role of CcAOS in the defense mechanism against the pathogen, we performed crosses between transgenic CcAOS plants and an infertile Arabidopsis AOS knockout mutant line. It was found that plants expressing CcAOS exhibit normal growth, remain infertile but are significantly more tolerant to the pathogen than wild type plants. Together, our results indicate that CcAOS is an important player in plant defense responses against oomycete infection and that its expression in susceptible varieties may be a valuable tool to mitigate biotic stress responses.

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Section: Discussionsupporting

confidence: 77%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Expression of Castanea crenata Allene Oxide Synthase in Arabidopsis Improves the Defense to Phytophthora cinnamomi

et al. 2021

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“…The AOS protein produces most of the nonvolatile oxylipins in plants and is a focus of attention in large part due to its key role in the biosynthesis of JA and biologically active JA-Ile (Farmer and Goossens, 2019). Although JA and JA-Ile have been widely associated with the defense response of plants against pathogens and insect attack (Wasternack, 2015), many of the roles of jasmonates in nature are still unknown (Hickman et al, 2017;Farmer and Goossens, 2019). Our findings suggest that JAdependent gene expression could be important for plant acclimation to combined HL1HS (Fig.…”

Section: Discussionmentioning

confidence: 99%

Jasmonic Acid Is Required for Plant Acclimation to a Combination of High Light and Heat Stress

et al. 2019

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“…Compared with other JA synthesis genes, the expression pattern of SlLOX11 was significantly different within 12 h of grafting, changing from asymmetrical to symmetrical, suggesting that the role of SlLOX11 in grafting development deserves further investigations. Many JA biosynthesis-related genes are still JA-inducible and are involved as AOS s [ 26 ]. Upon potato tuber injury, StAOS2 is immediately upregulated from an almost undetectable level at 0 h, reaching a peak at 2 h, and decreasing to less than half of the maximum expression within 6 h after wounding [ 27 ].…”

Section: Discussionmentioning

confidence: 99%

Plant grafting relieves asymmetry of jasmonic acid response induced by wounding between scion and rootstock in tomato hypocotyl

Wang

Chen

et al. 2020

PLoS ONE

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Plant grafting is a sequential wound healing process. However, whether wounding induces a different jasmonic acid (JA) response within half a day (12 h) after grafting or non-grafting remains unclear. Using the tomato hypocotyl grafting method, we show that grafting alleviates the asymmetrical accumulation of JA and jasmonic acid isoleucine conjugate (JA-Ile) in scion and rootstock caused by wounding, and from 2 h after tomato micrografting, grafting obviously restored the level of JA-Ile in the scion and rootstock. Meanwhile, five JA-related genes, SlLOX11, SlAOS, SlCOI1, SlLAPA and SlJA2L, are detected and show significant changes in transcriptional expression patterns within 12 h of grafting, from asymmetrical to symmetrical, when the expression of 30 JA- and defense-related genes were analyzed. The results indicated that grafting alleviates the asymmetrical JA and defense response between scion and rootstock of the tomato hypocotyl within 12 h as induced by wounding. Moreover, we demonstrate that in the very early hours after grafting, JA-related genes may be involved in a molecular mechanism that changes asymmetrical expression as induced by wounding between scion and rootstock, thereby promoting wound healing and grafting success.

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Jasmonates: what ALLENE OXIDE SYNTHASE does for plants

Cited by 50 publications

References 32 publications

Expression of Castanea crenata Allene Oxide Synthase in Arabidopsis Improves the Defense to Phytophthora cinnamomi

Expression of Castanea crenata Allene Oxide Synthase in Arabidopsis Improves the Defense to Phytophthora cinnamomi

Jasmonic Acid Is Required for Plant Acclimation to a Combination of High Light and Heat Stress

Plant grafting relieves asymmetry of jasmonic acid response induced by wounding between scion and rootstock in tomato hypocotyl

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