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Full-Text Articles in Life Sciences
Phytochrome B Integrates Light And Temperature Signals In Arabidopsis, Martina Legris, Cornelia Klose, E Sethe Burgie, Cecilia Costigliolo Rojas Rojas, Maximiliano Neme, Andreas Hiltbrunner, Philip A. Wigge, Eberhard Schäfer, Richard D. Vierstra, Jorge J. Casal
Phytochrome B Integrates Light And Temperature Signals In Arabidopsis, Martina Legris, Cornelia Klose, E Sethe Burgie, Cecilia Costigliolo Rojas Rojas, Maximiliano Neme, Andreas Hiltbrunner, Philip A. Wigge, Eberhard Schäfer, Richard D. Vierstra, Jorge J. Casal
Biology Faculty Publications & Presentations
Ambient temperature regulates many aspects of plant growth and development, but its sensors are unknown. Here, we demonstrate that the phytochrome B (phyB) photoreceptor participates in temperature perception through its temperature-dependent reversion from the active Pfr state to the inactive Pr state. Increased rates of thermal reversion upon exposing Arabidopsis seedlings to warm environments reduce both the abundance of the biologically active Pfr-Pfr dimer pool of phyB and the size of the associated nuclear bodies, even in daylight. Mathematical analysis of stem growth for seedlings expressing wild-type phyB or thermally stable variants under various combinations of light and temperature revealed …
Msl1 Is A Mechanosensitive Ion Channel That Dissipates Mitochondrial Membrane Potential And Maintains Redox Homeostasis In Mitochondria During Abiotic Stress, Chun Pong Lee, Grigory Maksaev, Gregory S. Jensen, Monika W. Murcha, Margaret E. Wilson, Mark Fricker, Ruediger Hell, Elizabeth S. Haswell, A Harvey Millar, Lee J. Sweetlove
Msl1 Is A Mechanosensitive Ion Channel That Dissipates Mitochondrial Membrane Potential And Maintains Redox Homeostasis In Mitochondria During Abiotic Stress, Chun Pong Lee, Grigory Maksaev, Gregory S. Jensen, Monika W. Murcha, Margaret E. Wilson, Mark Fricker, Ruediger Hell, Elizabeth S. Haswell, A Harvey Millar, Lee J. Sweetlove
Biology Faculty Publications & Presentations
Mitochondria must maintain tight control over the electrochemical gradient across their inner membrane to allow ATP synthesis while maintaining a redox-balanced electron transport chain and avoiding excessive reactive oxygen species production. However, there is a scarcity of knowledge about the ion transporters in the inner mitochondrial membrane that contribute to control of membrane potential. We show that loss of MSL1, a member of a family of mechanosensitive ion channels related to the bacterial channel MscS, leads to increased membrane potential of Arabidopsis mitochondria under specific bioenergetic states. We demonstrate that MSL1 localises to the inner mitochondrial membrane. When expressed in …
Plastid Osmotic Stress Influences Cell Differentiation At The Plant Shoot Apex, Margaret E. Wilson, Matthew Mixdorf, R Howard Berg, Elizabeth S. Haswell
Plastid Osmotic Stress Influences Cell Differentiation At The Plant Shoot Apex, Margaret E. Wilson, Matthew Mixdorf, R Howard Berg, Elizabeth S. Haswell
Biology Faculty Publications & Presentations
The balance between proliferation and differentiation in the plant shoot apical meristem is controlled by regulatory loops involving the phytohormone cytokinin and stem cell identity genes. Concurrently, cellular differentiation in the developing shoot is coordinated with the environmental and developmental status of plastids within those cells. Here, we employ an Arabidopsis thaliana mutant exhibiting constitutive plastid osmotic stress to investigate the molecular and genetic pathways connecting plastid osmotic stress with cell differentiation at the shoot apex. msl2 msl3 mutants exhibit dramatically enlarged and deformed plastids in the shoot apical meristem, and develop a mass of callus tissue at the shoot …