Remote sensing of future competitors: Impacts on plant defenses

Izaguirre, Miriam M.; Mazza, Carmen; Biondini, Mariela; Baldwin, Ian Thomas; Ballaré, Carlos L.

doi:10.1073/pnas.0509805103

Cited by 176 publications

(205 citation statements)

References 35 publications

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“…phyB signaling suppresses responses to herbivory (Ballaré , 2009;Moreno et al, 2009). Additionally, plants exposed to low R/FR have reduced resistance to insect pests, suggesting that in light conditions that favor extension growth, defenses may be compromised (Izaguirre et al, 2006). The phytochromes are known also to modulate the SA pathway.…”

Section: Chlorophyll Biosynthesis Is Suppressed By Coi1mentioning

confidence: 99%

Jasmonate and Phytochrome A Signaling inArabidopsisWound and Shade Responses Are Integrated through JAZ1 Stability

et al. 2010

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Jasmonate (JA) activates plant defense, promotes pollen maturation, and suppresses plant growth. An emerging theme in JA biology is its involvement in light responses; here, we examine the interdependence of the JA-and light-signaling pathways in Arabidopsis thaliana. We demonstrate that mutants deficient in JA biosynthesis and signaling are deficient in a subset of high irradiance responses in far-red (FR) light. These mutants display exaggerated shade responses to low, but not high, R/FR ratio light, suggesting a role for JA in phytochrome A (phyA) signaling. Additionally, we demonstrate that the FR light-induced expression of transcription factor genes is dependent on CORONATINE INSENSITIVE1 (COI1), a central component of JA signaling, and is suppressed by JA. phyA mutants had reduced JA-regulated growth inhibition and VSP expression and increased content of cis-(+)-12-oxophytodienoic acid, an intermediate in JA biosynthesis. Significantly, COI1-mediated degradation of JASMONATE ZIM DOMAIN1-b-glucuronidase (JAZ1-GUS) in response to mechanical wounding and JA treatment required phyA, and ectopic expression of JAZ1-GUS resulted in exaggerated shade responses. Together, these results indicate that JA and phyA signaling are integrated through degradation of the JAZ1 protein, and both are required for plant responses to light and stress.

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Section: Chlorophyll Biosynthesis Is Suppressed By Coi1mentioning

confidence: 99%

Jasmonate and Phytochrome A Signaling inArabidopsisWound and Shade Responses Are Integrated through JAZ1 Stability

et al. 2010

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“…Growth of pathogens, such as the biotrophic bacteria Pseudomonas syringae is enhanced in constitutively shade avoiding phytochrome mutants of A. thaliana 106,107 and plants are less resistant against herbivory when grown in crowded stands or when exposed to low R:FR conditions. [108][109][110] It is thought that for herbivore resistance in Arabidopsis, defense is reduced in low R:FR conditions due to a possible desensitization to jasmonic acid (JA). 110 Thus, for the SAS to be beneficial to the plant it should be induced only by light signals that reliably signal crowding.…”

Section: Sas Regulation Downstream Of the Hormonesmentioning

confidence: 99%

Physiological regulation and functional significance of shade avoidance responses to neighbors

Keuskamp

Sasidharan

Pierik

2010

Plant Signaling & Behavior

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Besides being a source of energy, light is also a source of information that plants can respond to. Most plants are able to react to the direction, intensity, composition and duration of light. These light components regulate such features as seed germination, photomorphogenesis, flowering time and the SAS. [10][11][12] The SAS encompasses various phenotypic traits (Fig. 1), including elongation of internodes, petioles and hypocotyls, apical dominance, early flowering and upward leaf movement (hyponasty).

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“…The superscript ''c'' and ''n'' refer to cytoplasmic and nuclear localization, respectively. plants to FR-enriched shade-and reflected-light environments (Schmitt et al, 1995;Smith and Whitelam, 1997;Izaguirre et al, 2006). Phytochrome-mediated shade avoidance responses are often counterproductive in highdensity agricultural venues, where they contribute to significant losses in crop yield (Kasperbauer, 1987;Smith et al, 1990).…”

Section: Agronomic Applications Of Y Gaf Mutants To Regulate Light Rementioning

confidence: 99%

Light-Independent Phytochrome Signaling Mediated by Dominant GAF Domain Tyrosine Mutants ofArabidopsisPhytochromes in Transgenic Plants

2007

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The photoreversibility of plant phytochromes enables continuous surveillance of the ambient light environment. Through expression of profluorescent, photoinsensitive Tyr-to-His mutant alleles of Arabidopsis thaliana phytochrome B (PHYBY276H) and Arabidopsis phytochrome A (PHYAY242H) in transgenic Arabidopsis plants, we demonstrate that photoconversion is not a prerequisite for phytochrome signaling. PHYBY276H-expressing plants exhibit chromophore-dependent constitutive photomorphogenesis, light-independent phyBY276H nuclear localization, constitutive activation of genes normally repressed in darkness, and light-insensitive seed germination. Fluence rate analyses of transgenic plants expressing PHYBY276H, PHYAY242H, and other YGAF mutant alleles of PHYB demonstrate that a range of altered light-signaling activities are associated with mutation of this residue. We conclude that the universally conserved GAF domain Tyr residue, with which the bilin chromophore is intimately associated, performs a critical role in coupling light perception to signal transduction by plant phytochromes.

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Remote sensing of future competitors: Impacts on plant defenses

Abstract: Far-red radiation (FR) reflected by green tissues is a key signal that plants use to detect the proximity of future competitors. Perception of increased levels of FR elicits a suite of responses collectively known as the shade-avoidance syndrome, whic

Cited by 176 publications

References 35 publications

Jasmonate and Phytochrome A Signaling inArabidopsisWound and Shade Responses Are Integrated through JAZ1 Stability

Jasmonate and Phytochrome A Signaling inArabidopsisWound and Shade Responses Are Integrated through JAZ1 Stability

Physiological regulation and functional significance of shade avoidance responses to neighbors

Light-Independent Phytochrome Signaling Mediated by Dominant GAF Domain Tyrosine Mutants ofArabidopsisPhytochromes in Transgenic Plants

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