Canopy Light and Plant Health

Ballaré, Carlos L.; Mazza, Carmen; Austin, Amy T.; Pierik, R.L.M.

doi:10.1104/pp.112.200733

Cited by 139 publications

(133 citation statements)

References 149 publications

(181 reference statements)

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“…It was shown that a significant role in the stimulation of resistance to fungal infection is played by phytochromes interacting with phytohormones (Roberts and Paul 2006;Xie et al 2011;Cerrudo et al 2012). Recently several reviews have been published, thoroughly describing the latest discoveries concerning the effect of light on plant resistance to pathogens, including also fungal pathogens (Kazan and Manners 2011;Ballaré et al 2012;Kangasjärvi et al 2012;Svyatyna and Riemann 2012).…”

Section: Effect Of Abiotic Stress On Carbohydrate Content and Resistamentioning

confidence: 99%

The role of sugar signaling in plant defense responses against fungal pathogens

2014

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Section: Effect Of Abiotic Stress On Carbohydrate Content and Resistamentioning

confidence: 99%

The role of sugar signaling in plant defense responses against fungal pathogens

2014

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“…We will not however cover in any detail ecological and agronomical aspects of the impact of UV-B on plants, as well as UV-B stress signaling (i.e. where UV-B-mediated damage is perceived), for which the reader is referred to the recent literature (Britt 2004, Ballare et al 2011, Ballare et al 2012, Mannuss et al 2012, Gonzalez Besteiro and Ulm 2013, Wargent and Jordan 2013.…”

Section: Uv-bmentioning

confidence: 99%

The UVR8 UV-B Photoreceptor: Perception, Signaling and Response

Tilbrook

Arongaus

Binkert

et al. 2013

The Arabidopsis Book

230

187

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Ultraviolet-B radiation (UV-B)is an intrinsic part of sunlight that is accompanied by significant biological effects. Plants are able to perceive UV-B using the UV-B photoreceptor UVR8 which is linked to a specific molecular signaling pathway and leads to UV-B acclimation. Herein we review the biological process in plants from initial UV-B perception and signal transduction through to the known UV-B responses that promote survival in sunlight. The UVR8 UV-B photoreceptor exists as a homodimer that instantly monomerises upon UV-B absorption via specific intrinsic tryptophans which act as UV-B chromophores. The UVR8 monomer interacts with COP1, an E3 ubiquitin ligase, initiating a molecular signaling pathway that leads to gene expression changes. This signaling output leads to UVR8-dependent responses including UV-B-induced photomorphogenesis and the accumulation of UV-B-absorbing flavonols. Negative feedback regulation of the pathway is provided by the WD40-repeat proteins RUP1 and RUP2, which facilitate UVR8 redimerization, disrupting the UVR8-COP1 interaction. Despite rapid advancements in the field of recent years, further components of UVR8 UV-B signaling are constantly emerging, and the precise interplay of these and the established players UVR8, COP1, RUP1, RUP2 and HY5 needs to be defined. UVR8 UV-B signaling represents our further understanding of how plants are able to sense their light environment and adjust their growth accordingly.

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“…This reduction in the resting level in JA might explain the higher levels of herbivore attack and of infection by necrotrophic pathogens in the leaves of shaded plants. Along the same line, plant exposure to UV-B radiation typically increases resistance to herbivores and pathogens (Ballaré et al 2012). For example, specific leaf mass, which is a correlate of leaf toughness, increased with light intensity in S. podophyllum (Ackerly 1992).…”

Section: Discussionmentioning

confidence: 99%

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confidence: 99%

“…Light conditions interact in multiple ways with plant resistance (Ballaré et al 2012). Among others, low red:far-red ratios as they occur in the forest understory can inhibit JA signalling (Ballaré et al 2012), but we do not know to which degree such physiological events determine the more general patterns in the attack of tropical wild plants by enemies with different life histories. A literature survey revealed more reports for biotrophic fungal pathogens on light-demanding herbaceous tropical plants, whereas necrotrophic fungal pathogens more frequently attack shade-tolerant host species (García-Guzmán & Heil 2014).…”

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Light environment affects the levels of resistance hormones in <em>Syngonium podophyllum</em> leaves and its attack by herbivores and fungi

García‐Guzmán¹,

Domínguez-Velázquez²,

Mendiola-Soto³

et al. 2017

Bot. Sci.

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Background: Little is known on factors determining infection of tropical plants by fungal pathogens, although multiple studies on model species show that light conditions affect the two major hormones that control resistance in plants to enemies. This is the first study using a natural population of a wild tropical plant to relate light conditions to resistance hormones and, the beneficial and detrimental interactions with insects and fungi. Hypothesis: Light conditions affect the endogenous levels of resistance hormones and thereby cause quantitative shifts among herbivores and nectrotrophic, biotrophic and endophytic fungi. Studied species: The tropical vine Syngonium podophyllum. Study site: Los Tuxtlas tropical rain forest, Mexico. Methods: We used GC-MS to quantify the concentration of the two resistance hormones in intact leaves and natural levels of herbivory and fungal disease in S. podophyllum plants growing naturally in the full sun or in the shade. Results: The proportion of leaves damaged by herbivores or infected by hemibiotrophic or necrotrophic pathogens was higher in shade than under full-light conditions. Damage caused by biotrophic pathogens was frequently observed in sun but not in shade. Levels of both hormones in phenotypically healthy leaves were higher in sun than in shade. Conclusions: (i) light has an effect on concentrations of plant resistance hormones in nature; (ii) these differences have consequences for fungi and animals that naturally interact with the plant, and (iii) the described effect can represent a physiological mechanism via which an abiotic factor affects the members of the guilds at higher trophic levels. Key Words: biotroph, fungal pathogen, endophyte, herbivore, hormone crosstalk, ITS5, jasmonic acid, necrotroph, resistance, salicylic acid Resumen Antecedentes: Poco se sabe sobre los factores que determinan la infección de plantas tropicales por patóge-nos, pero varios estudios con especies modelo muestran que las condiciones lumínicas afectan a las hormonas que controlan la resistencia de las plantas contra sus enemigos. Este es el primer estudio que analiza como las condiciones lumínicas afectan a las hormonas de resistencia y sus interacciones con insectos y hongos en una población silvestre. Hipótesis: Las condiciones lumínicas afectan los niveles endógenos de las hormonas de resistencia y por lo tanto afectan la incidencia de herbívoros y patógenos necrótrofos, biótrofos y endófitos. Especie estudiada: Syngonium podophyllum. Sitio de estudio: Los Tuxtlas, Veracruz, México. Métodos: Se utilizó GC-MS para cuantificar la concentración de hormonas de resistencia en hojas sanas y se evaluaron los niveles de daño por herbívoros y hongos patógenos en plantas de sol y sombra. Resultados: La proporción de hojas dañadas por herbívoros o infectadas por patógenos hemibiótrofos o necró-trofos fue mayor en la sombra que en luz. El daño causado por patógenos biótrofos se detectó en sol pero no en sombra. Los niveles de las hormonas de resistencia fueron más altos en sol ...

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Canopy Light and Plant Health

Cited by 139 publications

References 149 publications

The role of sugar signaling in plant defense responses against fungal pathogens

The role of sugar signaling in plant defense responses against fungal pathogens

The UVR8 UV-B Photoreceptor: Perception, Signaling and Response

Light environment affects the levels of resistance hormones in <em>Syngonium podophyllum</em> leaves and its attack by herbivores and fungi

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