Ultraviolet radiation enhances salicylic acid-mediated defense signaling and resistance to <i>Pseudomonas syringae</i> DC3000 in a jasmonic acid-deficient tomato mutant

Escobar‐Bravo, Rocío; Chen, Gang; Grosser, Katharina; Dam, Nicole M. van; Leiss, Kirsten A.; Klinkhamer, Peter G. L.

doi:10.1080/15592324.2019.1581560

Cited by 19 publications

(15 citation statements)

References 29 publications

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“…On the other hand, UV-B typically induces JA and SA, as stress-responsive hormones [40,48], which is contradictory to our findings, where the levels of both hormones decreased in the tops of treated plants. Considering that plants were UV-B treated for 14 days before harvest and sampling, a distinct JA and SA modulation during the first days of treatment cannot be discarded, which at the end of the experiment-likely involving an acclimation response-led to the hormone levels found in this study.…”

Section: Discussioncontrasting

confidence: 99%

UV-B Exposure of Black Carrot (Daucus carota ssp. sativus var. atrorubens) Plants Promotes Growth, Accumulation of Anthocyanin, and Phenolic Compounds

et al. 2019

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Black carrot (Daucus carota L. ssp. sativus var. atroburens) is a root vegetable with anthocyanins as major phenolic compounds. The accumulation of phenolic compounds is a common response to UV-B exposure, acting as protective compounds and as antioxidants. In the present study, black carrot plants grown under a 12-h photoperiod were supplemented with UV-B radiation (21.6 kj m−2 day−1) during the last two weeks of growth. Carrot taproots and tops were harvested separately, and the effect of the UV-B irradiance was evaluated in terms of size (biomass and length), total monomeric anthocyanin content (TMC), total phenolic content (TPC), and phytohormones levels. The results showed that UV-B irradiance promoted plant growth, as shown by the elevated root (30%) and top (24%) biomass, the increased TMC and TPC in the root (over 10%), and the increased TPC of the top (9%). A hormone analysis revealed that, in response to UV-B irradiance, the levels of abscisic acid (ABA), jasmonic acid (JA), and salicylic acid (SA) decreased in tops while the level of the cytokinins cis-zeatin (cZ) and trans-zeatinriboside (tZR) increased in roots, which correlated with an amplified growth and the accumulation of anthocyanins and phenolic compounds. Beyond the practical implications that this work may have, it contributes to the understanding of UV-B responses in black carrot.

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Section: Discussioncontrasting

confidence: 99%

UV-B Exposure of Black Carrot (Daucus carota ssp. sativus var. atrorubens) Plants Promotes Growth, Accumulation of Anthocyanin, and Phenolic Compounds

et al. 2019

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“…A similar beneficial effect of UV light was observed in the defenseless1 tomato mutant, which is deficient in JA biosynthesis. Here, a strong activation of salicylic acid‐associated defence responses by UV light after thrips infestation was observed (Escobar‐Bravo et al, 2019). UV‐B treatment also enhanced the resistance of Arabidopsis to Spodoptera litura herbivores through a JA‐dependent mechanism (Qi et al, 2018).…”

Section: Light and Biotic Stressmentioning

confidence: 89%

“…Besides blue and red light, also UV‐B enhances plant resistance to pathogen attacks. It activates SA‐associated defence mechanisms in a jasmonate‐deficient Arabidopsis mutant (Escobar‐Bravo et al, 2019) and enhances sinapate production in an UVR8‐dependent manner upon infection with the fungus Botrytis cinerea (Demkura & Ballaré, 2012). An overview of the signalling pathways involved in the crosstalk between light and biotic stress defence can be found in Figure 9.…”

Section: Light and Biotic Stressmentioning

confidence: 99%

Light acts as a stressor and influences abiotic and biotic stress responses in plants

Roeber

Bajaj

Rohde

et al. 2020

Plant Cell & Environment

172

104

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Light is important for plants as an energy source and a developmental signal, but it can also cause stress to plants and modulates responses to stress. Excess and fluctuating light result in photoinhibition and reactive oxygen species (ROS) accumulation around photosystems II and I, respectively. Ultraviolet light causes photodamage to DNA and a prolongation of the light period initiates the photoperiod stress syndrome. Changes in light quality and quantity, as well as in light duration are also key factors impacting the outcome of diverse abiotic and biotic stresses. Short day or shady environments enhance thermotolerance and increase cold acclimation. Similarly, shade conditions improve drought stress tolerance in plants. Additionally, the light environment affects the plants' responses to biotic intruders, such as pathogens or insect herbivores, often reducing growth‐defence trade‐offs. Understanding how plants use light information to modulate stress responses will support breeding strategies to enhance crop stress resilience. This review summarizes the effect of light as a stressor and the impact of the light environment on abiotic and biotic stress responses. There is a special focus on the role of the different light receptors and the crosstalk between light signalling and stress response pathways.

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“…Besides blue and red light, also UV-B enhances plant resistance to pathogen attacks. It activates SA-associated defense mechanisms in a JA-deficient Arabidopsis mutant (Escobar Bravo et al, 2019) and enhances sinapate production in an UVR8-dependent manner upon infection with the fungus Botrytis cinerea (Demkura & Ballare, 2012).…”

Section: Light and Pathogen Attackmentioning

confidence: 99%

Light as a stressor and its impact on biotic and abiotic stress responses in plants

Roeber

Bajaj

Rohde

et al. 2020

Preprint

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Light is important for plant life as a source of energy to drive photosynthesis but also as an environmental signal regulating development or cellular events such as resetting of the circadian clock. Light itself can cause stress such as excess light, fluctuating light, photoperiod and ultraviolet light stress. Light quality, quantity and light duration are important sources of information to prepare plants for future light stress events. Recurring light stress results in acclimation processes to the changing light environment. Furthermore, light regulates the responses of plants to diverse biotic and abiotic stresses. For example, short day conditions or shady environments prime thermotolerance and increase cold acclimation. Similarly, during drought stress, light signaling is important for the plant s stress response. Additionally, the light environment affects the plant s responses to biotic intruders such as pathogens or insect herbivores. Light influence many stress responses resulting in positive growth-defense trade-offs. Under shade, however, plants prioritize growth over defense and stress responses. In this review, we summarize the impact of light as a stressor and its influences on abiotic and biotic stress responses with special focus on the role of the different light receptors and the crosstalk between light signaling components and stress response pathways. ACKNOWLEDGEMENTSWe acknowledge funding by Deutsche Forschungsgemeinschaft (DFG) through Collaborative Research Centre 973 (www.sfb.973) and project Schm 814/29-1. There are no conflicts of interests.

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Ultraviolet radiation enhances salicylic acid-mediated defense signaling and resistance to Pseudomonas syringae DC3000 in a jasmonic acid-deficient tomato mutant

Abstract: (2019) Ultraviolet radiation enhances salicylic acid-mediated defense signaling and resistance to Pseudomonassyringae DC3000 in a jasmonic acid-deficient tomato mutant,

Cited by 19 publications

References 29 publications

UV-B Exposure of Black Carrot (Daucus carota ssp. sativus var. atrorubens) Plants Promotes Growth, Accumulation of Anthocyanin, and Phenolic Compounds

UV-B Exposure of Black Carrot (Daucus carota ssp. sativus var. atrorubens) Plants Promotes Growth, Accumulation of Anthocyanin, and Phenolic Compounds

Light acts as a stressor and influences abiotic and biotic stress responses in plants

Light as a stressor and its impact on biotic and abiotic stress responses in plants

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