Browsing by Author "Bailey-Serres, Julia"
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- Community recommendations on terminology and procedures used in flooding and low oxygen stress researchSasidharan, Rashmi; Bailey-Serres, Julia; Ashikari, Motoyuki; Atwell, Brian J.; Colmer, Timothy D.; Fagerstedt, Kurt; Fukao, Takeshi; Geigenberger, Peter; Hebelstrup, Kim H.; Hill, Robert D.; Holdsworth, Michael J.; Ismail, Abdelbagi M.; Licausi, Francesco; Mustroph, Angelika; Nakazono, Mikio; Pedersen, Ole; Perata, Pierdomenico; Sauter, Margret; Shih, Ming-Che; Sorrell, Brian K.; Striker, Gustavo G.; van Dongen, Joost T.; Whelan, James; Xiao, Shi; Visser, Eric J. W.; Voesenek, Laurentius A. C. J. (Wiley, 2017-06-01)Apart from playing a key role in important biochemical reactions, molecular oxygen (O2) and its by-products also have crucial signaling roles in shaping plant developmental programs and environmental responses. Even under normal conditions, sharp O2 gradients can occur within the plant when cellular O2 demand exceeds supply, especially in dense organs such as tubers, seeds and fruits. Spatial and temporal variations in O2 concentrations are important cues for plants to modulate development (van Dongen & Licausi, 2015; Considine et al., 2016). Environmental conditions can also expand the low O2 regions within the plant. For example, excessive rainfall can lead to partial or complete plant submergence resulting in O2 deficiency in the root or the entire plant (Voesenek & Bailey-Serres, 2015). Climate change associated increases in precipitation events have made flooding a major abiotic stress threatening crop production and food sustainability. This increased flooding and associated crop losses highlight the urgency of understanding plant flooding responses and tolerance mechanisms.
- Homeostatic response to hypoxia is regulated by the N-end rule pathway in plantsGibbs, Daniel J.; Lee, Seung Cho; Isa, Nurulhikma Md; Gramuglia, Silvia; Fukao, Takeshi; Bassel, George W.; Correia, Cristina Sousa; Corbineau, Françoise; Theodoulou, Frederica L.; Bailey-Serres, Julia; Holdsworth, Michael J. (2011-11)Plants and animals are obligate aerobes, requiring oxygen for mitochondrial respiration and energy production. In plants, an unanticipated decline in oxygen availability (hypoxia), as caused by roots becoming waterlogged or foliage submergence, triggers changes in gene transcription and messenger RNA translation that promote anaerobic metabolism and thus sustain substrate-level ATP production1. In contrast to animals2, oxygen sensing has not been ascribed to a mechanism of gene regulation in response to oxygen deprivation in plants. Here we show that the N-end rule pathway of targeted proteolysis acts as a homeostatic sensor of severe low oxygen levels in Arabidopsis, through its regulation of key hypoxia-response transcription factors. We found that plants lacking components of the N-end rule pathway constitutively express core hypoxia-response genes and are more tolerant of hypoxic stress. We identify the hypoxia-associated ethylene response factor group VII transcription factors of Arabidopsis as substrates of this pathway. Regulation of these proteins by the N-end rule pathway occurs through a characteristic conserved motif at the amino terminus initiating with Met-Cys. Enhanced stability of one of these proteins, HRE2, under low oxygen conditions improves hypoxia survival and reveals a molecular mechanism for oxygen sensing in plants via the evolutionarily conserved N-end rule pathway. SUB1A-1, a major determinant of submergence tolerance in rice3, was shown not to be a substrate for the N-end rule pathway despite containing the N-terminal motif, indicating that it is uncoupled from N-end rule pathway regulation, and that enhanced stability may relate to the superior tolerance of Sub1 rice varieties to multiple abiotic stresses.
- Homeostatic response to hypoxia is regulated by the N-end rule pathway in plantsGibbs, Daniel J.; Lee, Seung Cho; Isa, Nurulhikma Md; Gramuglia, Silvia; Fukao, Takeshi; Bassel, George W.; Correia, Cristina Sousa; Corbineau, Françoise; Theodoulou, Frederica L.; Bailey-Serres, Julia; Holdsworth, Michael J. (2011-10-23)Plants and animals are obligate aerobes, requiring oxygen for mitochondrial respiration and energy production. In plants, an unanticipated decline in oxygen availability (hypoxia), as caused by roots becoming waterlogged or foliage submergence, triggers changes in gene transcription and messenger RNA translation that promote anaerobic metabolism and thus sustain substrate-level ATP production. In contrast to animals, oxygen sensing has not been ascribed to a mechanism of gene regulation in response to oxygen deprivation in plants. Here we show that the N-end rule pathway of targeted proteolysis acts as a homeostatic sensor of severe low oxygen levels in Arabidopsis, through its regulation of key hypoxia-response transcription factors. We found that plants lacking components of the N-end rule pathway constitutively express core hypoxia-response genes and are more tolerant of hypoxic stress. We identify the hypoxia-associated ethylene response factor group VII transcription factors of Arabidopsis as substrates of this pathway. Regulation of these proteins by the N-end rule pathway occurs through a characteristic conserved motif at the amino terminus initiating with Met-Cys. Enhanced stability of one of these proteins, HRE2, under low oxygen conditions improves hypoxia survival and reveals a molecular mechanism for oxygen sensing in plants via the evolutionarily conserved N-end rule pathway. SUB1A-1, a major determinant of submergence tolerance in rice, was shown not to be a substrate for the N-end rule pathway despite containing the N-terminal motif, indicating that it is uncoupled from N-end rule pathway regulation, and that enhanced stability may relate to the superior tolerance of Sub1 rice varieties to multiple abiotic stresses.