The Calculation of Tensions in Cucurbita Pepo

Stocking, C. R.

doi:10.1002/j.1537-2197.1945.tb05096.x

Cited by 22 publications

(2 citation statements)

References 23 publications

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“…In theory it should be possible to remove gas from xylem conduits by vacuum after which water at atmospheric pressure injects the conduits automatically (see Stocking, 1948). A water suction pump was used to evacuate a glass vessel in which a dry vascular bundle was balanced on a loaded stand over water.…”

Section: Restoration Of Cavitation By Vacuum and Pressure Treatmentsmentioning

confidence: 99%

“…Many workers have emphasized the persistence of intact sap columns in severely wilted tissue (Holle, 1915;Bode, 1923;Crafts, 1939;Stocking, 1943). Stocking (1945) suggested that sap might cavitate at quite low negative pressures, whereas Preston (1961) supposed that negative pressures up to 30 atm (i atm = 1.013 bar) might develop before cavitation occurred. Many pressure-bomb estimations of xylem sap tensions have upheld the idea that xylem sap may be subjected to considerable negative pressures (e.g.…”

Section: Introductionmentioning

confidence: 99%

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STUDIES OF CAVITATION IN ISOLATED VASCULAR BUNDLES AND WHOLE LEAVES OF PLANTAGO MAJOR L.

Milburn

McLaughlin

1974

New Phytologist

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SUMMARYCavitation has been studied by acoustic detection in preserved and fresh vascular bundles and in whole leaves of Plantago and other plants. 'Clicks', indicating cavitation vibrations, were produced as vascular bundles lost water in a manner similar to that of Ricinus leaves (Milburn, 1973a), but the process was more rapid and freely suspended bundles jerked as they cavitated, like spore elator systems. Clicks were counted in a semi-quantitative study of both cavitation and the reverse process, the restoration of water-filled xylem conduits. Restoration was greatly enhanced by compression or vacuum infiltration treatments in comparison with simple soaking: apparently gas entrainment is the major obstacle preventing refilling.Cavitation within wilting leaves was much less extensive than when isolated bundles are dried, indicating that cavitation is generally incomplete under natural conditions. Xylem sap tensions at which cavitation is incipient were estimated approximately by balancing cavitation against the external humidity. Sap tensions at incipient cavitation could be measured more accurately using a pressure bomb, however. These tensions were surprisingly low, covering a range of tensions (5-15 bar) expected to occur under field conditions. Cavitation was detected in Plantago under natural field conditions and in other plants also, especially Tussilago. Further implications are discussed.

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Section: Restoration Of Cavitation By Vacuum and Pressure Treatmentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

STUDIES OF CAVITATION IN ISOLATED VASCULAR BUNDLES AND WHOLE LEAVES OF PLANTAGO MAJOR L.

Milburn

McLaughlin

1974

New Phytologist

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The conduction of sap

Milburn

Johnson

1966

Planta

159

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An apparatus has been constructed for the detection of vibrations generated within plant tissue. This can detect vibrations due to water cavitation within fern sporangia. Using this detector 'clicks' have been obtained from Ricinus petioles and leaves in a condition when, from previous work, water cavitation might be expected.Evidence is provided to show: 1. That 'click' production is correlated with the water status of the plant tissue. 2. There are reasons for opposing the possibility that 'clicks' result from tissue fracture alone. 3. The 'clicks' may be detected in a wide range of plants. The implications of the apparent vulnerability of water conducting systems in plants are discussed.

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Absorption of water by plants

Slatyer

1960

Bot. Rev

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The Calculation of Tensions in Cucurbita Pepo

Cited by 22 publications

References 23 publications

STUDIES OF CAVITATION IN ISOLATED VASCULAR BUNDLES AND WHOLE LEAVES OF PLANTAGO MAJOR L.

STUDIES OF CAVITATION IN ISOLATED VASCULAR BUNDLES AND WHOLE LEAVES OF PLANTAGO MAJOR L.

The conduction of sap

Absorption of water by plants

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