期刊
NEW PHYTOLOGIST
卷 170, 期 1, 页码 75-85出版社
BLACKWELL PUBLISHING
DOI: 10.1111/j.1469-8137.2005.01633.x
关键词
balance pressure; cell area fraction (CAF); cell wall moisture; cytorrhisis; Eucalyptus pauciflora (snow gum); fibre saturation point; forces in cell walls; humidity in intercellular spaces
The palisade cell sizes in leaves of Eucalyptus pauciflora were estimated in paradermal sections of cryo-fixed leaves imaged in the cryo-scanning electron microscope, as a quantity called the cell area fraction (CAF). Cell sizes were measured in detached leaves as a function of leaf water content, in intact leaves in the field during a days transpiration as a function of balance pressure of adjacent leaves, and on leaf disks equilibrated with air of relative humidities from 100 to 58%. Values of CAF ranged from 0.82 at saturation to approx. 0.3 in leaves dried to a relative water content (RWC) of 0.5, and in the field to approx. 0.58 at 15 bar (1.5 MPa) balance pressure. At a CAF of 0.58, the moisture content of the cell walls is in equilibrium with air at 90% relative humidity, which is the estimated relative humidity in the intercellular spaces. It is shown that at this moisture content, the cell walls could be exerting a pressure of approx. 50 bar on the cell contents.
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