Genome‐wide association study reveals novel players in defense hormone crosstalk in <i>Arabidopsis</i>

Proietti, Sara; Caarls, Lotte; Coolen, Silvia; Pelt, J.A. van; Wees, Saskia C.M. Van; Pieterse, Corné M. J.

doi:10.1111/pce.13357

Cited by 73 publications

(64 citation statements)

References 100 publications

(184 reference statements)

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“…This is subsequently followed by downstream defense responses regulated through hormone signaling pathways, whose jasmonic acid (JA) and salicylic acid (SA) are the major players involved (Reymond, 2013). Both the individual hormones and their crosstalk play an essential role in fine-tuning defense responses to specific herbivores (Proietti et al, 2018).…”

Section: Defense Pathways and Gene Expressionmentioning

confidence: 99%

Chemical, Physiological and Molecular Responses of Host Plants to Lepidopteran Egg-Laying

et al. 2020

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Plant-lepidopteran interactions involve complex processes encompassing molecules and regulators to counteract defense responses they develop against each other. Lepidoptera identify plants for oviposition and exploit them as larval food sources to complete their development. In turn, plants adopt different strategies to overcome and limit herbivorous damages. The insect egg deposition on leaves can already induce a number of defense responses in several plant species. This minireview deals with the main features involved in the interaction between plants and lepidopteran egg-laying, focusing on responses from both insect and plant side. We discuss different aspects of direct and indirect plant responses triggered by lepidopteran oviposition. In particular, we focus our attention on the mechanisms underlying egg-induced plant defenses that can i) directly damage the eggs such as localized hypersensitive response (HR)-like necrosis, neoplasm formation, production of ovicidal compounds and ii) indirect defenses, such as production of oviposition-induced plant volatiles (OIPVs) used to attract natural enemies (parasitoids) able to kill the eggs or hatching larvae. We provide an overview of chemical, physiological, and molecular egg-mediated plant responses induced by both specialist and generalist lepidopteran species, also dealing with effectors, elicitors, and chemical signals involved in the process. Egg-associated microorganisms are also discussed, although little is known about this third partner participating in plant-lepidopteran interactions.

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Section: Defense Pathways and Gene Expressionmentioning

confidence: 99%

Chemical, Physiological and Molecular Responses of Host Plants to Lepidopteran Egg-Laying

et al. 2020

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“…Interactions between JA and other phytohormones are crucial factors which plants are likely to regulate to minimize growth and defense trade-offs. Proietti et al (2018) performed GWAS on 349 natural accessions of Arabidopsis to dissect the crosstalk of salicylic acid (SA) and abscisic acid (ABA) with JA. The magnitude of change in JA-induced expression levels of the PLANT DEFENSIN1.2 (PDF1.2) gene was calculated for each accessions 24 h after treating the leaves with methyl jasmonate (MeJA) alone or a combination of MeJA and SA or ABA, respectively, as a readout for GWAS and interpreted as evidence of phytohormonal 'crosstalk', without specifying the nature of the interaction.…”

Section: Natural Variation In Ja-mediated Responsesmentioning

confidence: 99%

“…Through fine mapping and transfer DNA insertion mutant analysis, two genes, encoding a glyoxalase protein and a response regulator involved in cytokinin signaling, were found to be involved in the JA-SA interaction and also in resistance against Botrytis cinerea. Similarly, an uncharacterized cation efflux family protein was shown to affect the interaction of JA-ABA signaling by suppressing MeJAinduced expression of PDF1.2 and VSP2 and resistance against Mamestra brassicae (Proietti et al, 2018). Although these studies highlight potential players in JA-SA and JA-ABA 'crosstalk', their functional roles in the interaction remain unclear as the phytohormone levels were not analyzed when the plants were challenged with a pathogen or herbivore.…”

Section: Natural Variation In Ja-mediated Responsesmentioning

confidence: 99%

Using natural variation to achieve a whole‐plant functional understanding of the responses mediated by jasmonate signaling

Ray

Halitschke

et al. 2019

The Plant Journal

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Summary The dramatic advances in our understanding of the molecular biology and biochemistry of jasmonate (JA) signaling have been the subject of several excellent recent reviews that have highlighted the phytohormonal function of this signaling pathway. Here, we focus on the responses mediated by JA signaling which have consequences for a plant's Darwinian fitness, i.e. the organism‐level function of JA signaling. The most diverse module in the signaling cascade, the JAZ proteins, and their interactions with other proteins and transcription factors, allow this canonical signaling cascade to mediate a bewildering array of traits in different tissues at different times; the functional coherence of these diverse responses are best appreciated in an organismal/ecological context. From published work, it appears that jasmonates can function as the ‘Swiss Army knife’ of plant signaling, mediating many different biotic and abiotic stress and developmental responses that allow plants to contextualize their responses to their frequently changing local environments and optimize their fitness. We propose that a deeper analysis of the natural variation in both within‐plant and within‐population JA signaling components is a profitable means of attaining a coherent whole‐plant functional perspective of this signaling cascade, and provide examples of this approach from the Nicotiana attenuata system.

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“…We used –log10( p ) 6.5 as an arbitrary p-score cut-off to select SNPs for further investigation. This threshold is conservative compared to several other previously published studies in Arabidopsis (46–48). We investigated known core circadian and flowering time genes to see whether these were significantly associated with any of the traits measured.…”

Section: Resultsmentioning

confidence: 92%

Circadian diversity in SwedishArabidopsisaccessions is associated with naturally occurring genetic variation inCOR28

Rees

Joynson

Brown

et al. 2019

Preprint

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Circadian clocks have evolved to resonate with external day and night cycles. However, these entrainment signals are not consistent everywhere and vary with latitude, climate and seasonality. This leads to divergent selection for clocks which are locally adapted. To investigate the genetic basis for this, we used a Delayed Fluorescence (DF) imaging assay to screen 191 naturally occurring Swedish Arabidopsis accessions for their circadian phenotypes. We demonstrate period variation with both latitude and sub-population. Several candidate loci linked to period, phase and Relative Amplitude Error (RAE) were revealed by genome-wide association mapping and candidate genes were investigated using TDNA mutants. We show that natural variation in a single non-synonymous substitution within COR28 is associated with a long-period and late-flowering phenotype similar to that seen in TDNA knock-out mutants. COR28 is a known coordinator of flowering time, freezing tolerance and the circadian clock; all of which may form selective pressure gradients across Sweden. Finally, we tested circadian variation under reduced temperatures and show that fast and slow period phenotypic tails remain diverged and follow a distinctive ‘arrow-shaped’ trend indicative of selection for a cold-biased temperature compensation response.

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Genome‐wide association study reveals novel players in defense hormone crosstalk in Arabidopsis

Cited by 73 publications

References 100 publications

Chemical, Physiological and Molecular Responses of Host Plants to Lepidopteran Egg-Laying

Chemical, Physiological and Molecular Responses of Host Plants to Lepidopteran Egg-Laying

Using natural variation to achieve a whole‐plant functional understanding of the responses mediated by jasmonate signaling

Circadian diversity in SwedishArabidopsisaccessions is associated with naturally occurring genetic variation inCOR28

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