Oxygen Sensing Coordinates Photomorphogenesis to Facilitate Seedling Survival
| Autor: | George W. Bassel, Sophie Berckhan, Miguel A. Blázquez, Daniel J. Rooney, Cristina Sousa Correia, Mohamad Abbas, Nora Marín-de la Rosa, Daniel J. Gibbs, José León, Michael J. Holdsworth, Jorge Vicente Conde, David Alabadí |
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| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Light
Agricultural and Biological Sciences(all) biology Biochemistry Genetics and Molecular Biology(all) Morphogenesis Hypoxia (environmental) 15. Life on land biology.organism_classification Skotomorphogenesis General Biochemistry Genetics and Molecular Biology Hypocotyl Oxygen Magnoliopsida Seedlings Seedling Germination Report Botany Photomorphogenesis General Agricultural and Biological Sciences Transcription factor |
| Zdroj: | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia instname Current Biology |
| Popis: | Summary Successful emergence from the soil is essential for plant establishment in natural and farmed systems. It has been assumed that the absence of light in the soil is the preeminent signal perceived during early seedling development, leading to a distinct morphogenic plan (skotomorphogenesis) [1], characterized by traits providing an adaptive advantage until emergence and photomorphogenesis. These traits include suppressed chlorophyll synthesis, promotion of hypocotyl elongation, and formation of a closed apical hook that protects the stem cell niche from damage [2, 3]. However, absence of light by itself is not a sufficient environmental signal for early seedling development [4, 5]. Reduced oxygen levels (hypoxia) can occur in water-logged soils [6–8]. We therefore hypothesized that below-ground hypoxia may be an important, but thus far undiscovered, ecological component regulating seedling development. Here, we show that survival and establishment of seedlings following darkness depend on their ability to sense hypoxia, through enhanced stability of group VII Ethylene Response Factor (ERFVII) transcription factors. Hypoxia is perceived as a positive environmental component in diverse taxa of flowering plants, promoting maintenance of skotomorphogenic traits. Hypoxia greatly enhances survival once light is perceived, while oxygen is necessary for the subsequent effective completion of photomorphogenesis. Together with light perception, oxygen sensing therefore allows an integrated response to the complex and changing physical microenvironment encountered during early seedling growth. We propose that plants monitor the soil’s gaseous environment after germination, using hypoxia as a key external cue to protect the stem cell niche, thus ensuring successful rapid establishment upon emergence above ground. Highlights • Low oxygen (hypoxia) enhances seedling survival in the dark • Hypoxia is sensed by oxygen-mediated degradation of ERFVII transcription factors • Stable ERFVIIs enhance dark-activated development and repress light-activated development • Plants monitor the gaseous environment to coordinate photomorphogenesis Abbas et al. demonstrate that hypoxia sensing is an important component of photomorphogenesis. Hypoxia acts as a positive external positional cue controlling morphogenetic and biochemical adaptations to protect the stem cell niche. Sensing hypoxia in the dark coordinates responses that maximize survival and establishment in the light. |
| Databáze: | OpenAIRE |
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