Some possible sources of error in determining bulk elastic moduli and other parameters from pressure–volume curves of shoots and leaves

Cheung, Y. N. S.; Tyree, Melvin T.; Dainty, J.

doi:10.1139/b76-082

Cited by 85 publications

(54 citation statements)

References 2 publications

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“…It should be noted that negative pressures are likely to occur during only extracellular freezing in the cells, hence the use of term L,, in the above expression. However, in many tissues E is not likely to be constant (Cheung et al, 1976) and thus a more general expression, relating pressure to changes in unfrozen water content of cells, can be given by:…”

Section: Theory a N D Calculationsmentioning

confidence: 99%

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Freezing Characteristics of Rigid Plant Tissues (Development of Cell Tension during Extracellular Freezing)

Rajashekar

Burke

1996

Plant Physiology

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The freezing characteristics and development of cell tension during extracellular freezing were examined i n supercooling stem tissues of riverbank grapes (Vitis riparia) and cold-hardened leaves of live oak (Quercus virginiana) and mountain cranberry (Vaccinium vitis-idaea). Dormant stem xylem and pith tissues of riverbank grapes were resistant to freeze-induced dehydration above the homogeneous nucleation temperature, and they developed cell tension reaching a maximum of 27 MPa. Similarly, extracellular freezing induced cell tension in the leaves of live oak and mountain cranberry. Maximum cell tension in the leaves of live oak was 16.8 MPa and 8.3 MPa i n the leaves of mountain cranberry. Following peak tensions in the leaves, a decline i n the pressure was observed with progressive freezing. The results suggest that resistance t o cell deformation during extracellular freezing due to cell-wall rigidity can lead to reduced cell dehydration and increased cell tension.A relationship to predict freezing behavior in plant tissues based on cell rigidity is presented. Based on cell-water relations and ice nucleation rates, cell-wall rigidity has been shown to effect the freezing characteristics of plant tissues, including freezeinduced dehydration, supercooling, and homogeneous nucleation temperatures.

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Section: Theory a N D Calculationsmentioning

confidence: 99%

“…Henderson and Speedy (1987) also noted that cavitation of water at low temperatures was often associated with spontaneous ice formation, which may result in lethal injury to cells. Studies have shown that stretched water under even small tension can lead to cavitation in plant cells at room temperature (Tyree andDixon, 1983, 1986). …”

Section: Cell Tensionmentioning

confidence: 99%

Freezing Characteristics of Rigid Plant Tissues (Development of Cell Tension during Extracellular Freezing)

Rajashekar

Burke

1996

Plant Physiology

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“…As a result, such species can maintain a positive 4,,, despite decreasing P. Regulation of tissue solute concentation, generally termed osmotic adjustment, has been considered an important mechanism by which higher plants can adapt to increasing salinity (8,16). In species that have been shown to adjust osmotically, maximum 4,6 in salinized plants has often been found to be higher than in nonsalinized plants (1,2,9,11).…”

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confidence: 99%

“…lowering the minimum possible f), 4 3Abbreviations: *, water potential; 4', osmotic potential; 4,,, turgor potential; E, volumetric bulk modulus of elasticity; OWC, osmotic water content; P, pressure; V, volume; PPFD, photosynthetic photon flux density.…”

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Salinity Effects on Water Potential Components and Bulk Elastic Modulus of Alternanthera philoxeroides (Mart.) Griseb.

Bolaños¹,

Longstreth²

1984

Plant Physiol.

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ABSTRACrPressure volume curves for Alterwathera philoxeroides (Mart) Griseb. (alligtor weed) growin in 0 to 400 millimolar NaCa were used to determine water potentil (1), osmotic potential (A,), turgor potential (A,) and the bulk elastic modulus (e) of shoots at different tissue water contents. Values of A, decreased with inasing salinity and tissue * was always lower than rhizosphere '. The relationship between 4X, and tissue water content changed because e increased with saity. As a result, salt-stressed plnts had arger ranges ofpositive turgor but smaller ranges of tissue water content over which A', was positive. To our knowledge, this is the first report of such a salinity effect on e in higher plants. These increases in e with salinity provided a mechanism by which

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Structural Specialization of the Site of Response to Vectorial Photo‐excitation in the Solar‐tracking Leaf of Lavatera Cretica

Werker

Koller

1987

American J of Botany

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Structural features of the pulvinus of the solar‐tracking leaf of Lavatera cretica L. that are involved in its capacity for omnidirectional and fully reversible bending in response to vectorial excitation of the lamina were studied by light‐ and scanning electron microscopy. Pulvini that had bent in the plane at right angles to the midvein were bisected along that plane and the symmetrical tissues of the expanded and contracted flanks were compared. The pulvinus contains a central vascular core and exhibits a transversely furrowed exterior. These specialized features enable the fully mature tissue of this region of the petiole to bend reversibly. The epidermis, chlorenchyma, peripheral collenchyma, and cortical parenchyma in the pulvinus form concentric, radially symmetric sheaths around the vascular core and exhibit structural features in their cell walls that would allow considerable changes in cell volume and consequently enable the omnidirectional bending of this pulvinus. Thickened wall portions of the pulvinar epidermis and peripheral collenchyma exhibit a highly specialized architecture, consisting of alternating thick and thin strips, that enhances their flexibility, while maintaining mechanical support. Cell walls of the chlorenchyma and the cortical parenchyma are thin and capable of reversible infolding. Those of the cortical parenchyma also exhibit numerous prominent transverse pit fields, indicative of anisotropic orientation of their microfibrillar lattice transverse to the pulvinar axis. This orientation is compatible with elastic deformation of the cortical parenchyma cells along the pulvinar axis. Filament‐like cytoplasmic strands were observed along the walls of pulvinar motor cells, predominantly transverse to the pulvinar axis, but their function (if any) in volume changes of these cells is unknown.

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Some possible sources of error in determining bulk elastic moduli and other parameters from pressure–volume curves of shoots and leaves

Cited by 85 publications

References 2 publications

Freezing Characteristics of Rigid Plant Tissues (Development of Cell Tension during Extracellular Freezing)

Freezing Characteristics of Rigid Plant Tissues (Development of Cell Tension during Extracellular Freezing)

Salinity Effects on Water Potential Components and Bulk Elastic Modulus of Alternanthera philoxeroides (Mart.) Griseb.

Structural Specialization of the Site of Response to Vectorial Photo‐excitation in the Solar‐tracking Leaf of Lavatera Cretica

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