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69 results on '"Casal, Jorge"'

1. Plant Thermosensors.

Author

Casal JJ, Murcia G, and Bianchimano L

Subjects
Temperature, Acclimatization genetics, Plant Proteins genetics, Plant Proteins metabolism, Transcriptome genetics, Plant Physiological Phenomena genetics, Gene Expression Regulation, Plant, Plants genetics, Plants metabolism, Signal Transduction, Thermosensing genetics
Abstract

Plants are exposed to temperature conditions that fluctuate over different time scales, including those inherent to global warming. In the face of these variations, plants sense temperature to adjust their functions and minimize the negative consequences. Transcriptome responses underlie changes in growth, development, and biochemistry (thermomorphogenesis and acclimation to extreme temperatures). We are only beginning to understand temperature sensation by plants. Multiple thermosensors convey complementary temperature information to a given signaling network to control gene expression. Temperature-induced changes in protein or transcript structure and/or in the dynamics of biomolecular condensates are the core sensing mechanisms of known thermosensors, but temperature impinges on their activities via additional indirect pathways. The diversity of plant responses to temperature anticipates that many new thermosensors and eventually novel sensing mechanisms will be uncovered soon.

Published
2024
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2. Photoreceptor signaling networks in plant responses to shade.

Author

Casal JJ

Subjects
Gibberellins metabolism, Light, Phytochrome metabolism, Plant Growth Regulators metabolism, Ecosystem, Photoreceptors, Plant metabolism, Plants metabolism, Signal Transduction
Abstract

The dynamic light environment of vegetation canopies is perceived by phytochromes, cryptochromes, phototropins, and UV RESISTANCE LOCUS 8 (UVR8). These receptors control avoidance responses to preclude exposure to limiting or excessive light and acclimation responses to cope with conditions that cannot be avoided. The low red/far-red ratios of shade light reduce phytochrome B activity, which allows PHYTOCHROME INTERACTING FACTORS (PIFs) to directly activate the transcription of auxin-synthesis genes, leading to shade-avoidance responses. Direct PIF interaction with DELLA proteins links gibberellin and brassinosteroid signaling to shade avoidance. Shade avoidance also requires CONSTITUTIVE PHOTOMORPHOGENESIS 1 (COP1), a target of cryptochromes, phytochromes, and UVR8. Multiple regulatory loops and the input of the circadian clock create a complex network able to respond even to subtle threats of competition with neighbors while still compensating for major environmental fluctuations such as the day-night cycles.

Published
2013
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3. Multiple dimensions in plant signal transduction: an overview.

Author

Casal JJ

Subjects
Gene Expression Regulation, Plant, Models, Biological, Plant Proteins genetics, Plant Proteins metabolism, Plants genetics, Signal Transduction genetics, Plant Proteins physiology, Plants metabolism, Signal Transduction physiology
Abstract

Each process involved in the generation of plant body form and function is under the control of signals from the exogenous and/or endogenous plant environment. These controls are necessary for adequate plant adjustment to the prevailing conditions, but at the same time they impose the need for sophisticated mechanisms to achieve adequate sensitivity towards signals and stability against noise. To cope with this challenge plants use multiple signals, multiple receptors even for the same signal and interactive signal transducers with multiple targets. Here we provide an overview of this multiplicity and its functional significance.

Published
2009
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