Freezing resistance in Patagonian woody shrubs: the role of cell wall elasticity and stem vessel size
Freezing resistance through avoidance or tolerance of extracellular ice nucleation is important for plant survival in habitats with frequent subzero temperatures. However, the role of cell walls in leaf freezing resistance and the coordination between leaf and stem physiological processes under subz...
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2016
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0829318X_v36_n8_p1007_Zhang http://hdl.handle.net/20.500.12110/paper_0829318X_v36_n8_p1007_Zhang |
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paper:paper_0829318X_v36_n8_p1007_Zhang2023-06-08T15:46:10Z Freezing resistance in Patagonian woody shrubs: the role of cell wall elasticity and stem vessel size Bulk elastic modulus Ice nucleation temperature Leaf lethal temperature Patagonian steppe Pressure–volume relationship Supercooling. cell elastic modulus freezing nucleation physiological response shrub steppe supercooling survival woody plant Atlantic Ocean Patagonian Sea cell wall cold metabolism physiology plant leaf plant stem Young modulus Cell Wall Cold Temperature Elastic Modulus Plant Leaves Plant Stems Freezing resistance through avoidance or tolerance of extracellular ice nucleation is important for plant survival in habitats with frequent subzero temperatures. However, the role of cell walls in leaf freezing resistance and the coordination between leaf and stem physiological processes under subzero temperatures are not well understood. We studied leaf and stem responses to freezing temperatures, leaf and stem supercooling, leaf bulk elastic modulus and stem xylem vessel size of six Patagonian shrub species from two sites (plateau and low elevation sites) with different elevation and minimum temperatures. Ice seeding was initiated in the stem and quickly spread to leaves, but two species from the plateau site had barriers against rapid spread of ice. Shrubs with xylem vessels smaller in diameter had greater stem supercooling capacity, i.e., ice nucleated at lower subzero temperatures. Only one species with the lowest ice nucleation temperature among all species studied exhibited freezing avoidance by substantial supercooling, while the rest were able to tolerate extracellular freezing from −11.3 to −20 °C. Leaves of species with more rigid cell walls (higher bulk elastic modulus) could survive freezing to lower subzero temperatures, suggesting that rigid cell walls potentially reduce the degree of physical injury to cell membranes during the extracellular freezing and/or thaw processes. In conclusion, our results reveal the temporal–spatial ice spreading pattern (from stem to leaves) in Patagonian shrubs, and indicate the role of xylem vessel size in determining supercooling capacity and the role of cell wall elasticity in determining leaf tolerance of extracellular ice formation. © The Author 2016. Published by Oxford University Press. All rights reserved. 2016 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0829318X_v36_n8_p1007_Zhang http://hdl.handle.net/20.500.12110/paper_0829318X_v36_n8_p1007_Zhang |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Bulk elastic modulus Ice nucleation temperature Leaf lethal temperature Patagonian steppe Pressure–volume relationship Supercooling. cell elastic modulus freezing nucleation physiological response shrub steppe supercooling survival woody plant Atlantic Ocean Patagonian Sea cell wall cold metabolism physiology plant leaf plant stem Young modulus Cell Wall Cold Temperature Elastic Modulus Plant Leaves Plant Stems |
| spellingShingle |
Bulk elastic modulus Ice nucleation temperature Leaf lethal temperature Patagonian steppe Pressure–volume relationship Supercooling. cell elastic modulus freezing nucleation physiological response shrub steppe supercooling survival woody plant Atlantic Ocean Patagonian Sea cell wall cold metabolism physiology plant leaf plant stem Young modulus Cell Wall Cold Temperature Elastic Modulus Plant Leaves Plant Stems Freezing resistance in Patagonian woody shrubs: the role of cell wall elasticity and stem vessel size |
| topic_facet |
Bulk elastic modulus Ice nucleation temperature Leaf lethal temperature Patagonian steppe Pressure–volume relationship Supercooling. cell elastic modulus freezing nucleation physiological response shrub steppe supercooling survival woody plant Atlantic Ocean Patagonian Sea cell wall cold metabolism physiology plant leaf plant stem Young modulus Cell Wall Cold Temperature Elastic Modulus Plant Leaves Plant Stems |
| description |
Freezing resistance through avoidance or tolerance of extracellular ice nucleation is important for plant survival in habitats with frequent subzero temperatures. However, the role of cell walls in leaf freezing resistance and the coordination between leaf and stem physiological processes under subzero temperatures are not well understood. We studied leaf and stem responses to freezing temperatures, leaf and stem supercooling, leaf bulk elastic modulus and stem xylem vessel size of six Patagonian shrub species from two sites (plateau and low elevation sites) with different elevation and minimum temperatures. Ice seeding was initiated in the stem and quickly spread to leaves, but two species from the plateau site had barriers against rapid spread of ice. Shrubs with xylem vessels smaller in diameter had greater stem supercooling capacity, i.e., ice nucleated at lower subzero temperatures. Only one species with the lowest ice nucleation temperature among all species studied exhibited freezing avoidance by substantial supercooling, while the rest were able to tolerate extracellular freezing from −11.3 to −20 °C. Leaves of species with more rigid cell walls (higher bulk elastic modulus) could survive freezing to lower subzero temperatures, suggesting that rigid cell walls potentially reduce the degree of physical injury to cell membranes during the extracellular freezing and/or thaw processes. In conclusion, our results reveal the temporal–spatial ice spreading pattern (from stem to leaves) in Patagonian shrubs, and indicate the role of xylem vessel size in determining supercooling capacity and the role of cell wall elasticity in determining leaf tolerance of extracellular ice formation. © The Author 2016. Published by Oxford University Press. All rights reserved. |
| title |
Freezing resistance in Patagonian woody shrubs: the role of cell wall elasticity and stem vessel size |
| title_short |
Freezing resistance in Patagonian woody shrubs: the role of cell wall elasticity and stem vessel size |
| title_full |
Freezing resistance in Patagonian woody shrubs: the role of cell wall elasticity and stem vessel size |
| title_fullStr |
Freezing resistance in Patagonian woody shrubs: the role of cell wall elasticity and stem vessel size |
| title_full_unstemmed |
Freezing resistance in Patagonian woody shrubs: the role of cell wall elasticity and stem vessel size |
| title_sort |
freezing resistance in patagonian woody shrubs: the role of cell wall elasticity and stem vessel size |
| publishDate |
2016 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0829318X_v36_n8_p1007_Zhang http://hdl.handle.net/20.500.12110/paper_0829318X_v36_n8_p1007_Zhang |
| _version_ |
1768544476367683584 |