Rapid Field Measurement of Leaf Water Potential in Soybean<sup>1</sup>

Boyer, John S.; Ghorashy, S. R.

doi:10.2134/agronj1971.00021962006300020050x

Cited by 26 publications

(15 citation statements)

References 3 publications

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“…Leaf water potential was tneasured with a pressure chatnber (tnodel 3000, Soil Moistute Equiptnent Corpotation, Santa Bat bat a, CA, USA) on fully mature leaves from Ihe upper canopy. It had previously been determined that leaf water potentials measuted by pressute chamber and the isopiestic technique wete not significantly diffetent, a result also obtained by Boyer & Ghorashy (1971). Imtnediately after water potential measutetnents, the conductance of individual leaves from a similar location was tneasured with a steady-state porometer (L1I600, LICOR, Lincoln, NE, USA) on 5-7 leaves per ttay.…”

Section: Plant Water Use and Water Statusmentioning

confidence: 82%

Response of the water status of soybean to changes in soil water potentials controlled by the water pressure in microporous tubes

Steinberg

Henninger

1997

Plant Cell & Environment

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Water transport through a microporous tube-soil-plant system wa.s investigated by measuring tbe response of soil and piant water status to step cbange reductions in the water pressure within the tubes. Soybeans were germinated and grown in a porous ceramic 'soii' at a porous tube water pressure of -0-5 kPa for 28 d. During tbis time, tbe soii matric potential was nearly in equilibrium witb tube water pressure. Water pressure in tbe porous tubes was then reduced to eitber -l-O, -1-5 or -2-{) kPa. Sap flow rates, leaf conductance and soil, root and leaf water potentials were measured before and after this change. A reduction in porous tube water pressure from -0-5 to -1-0 or -1-5 kPa did not result in any significant cbange in soil or plant water status. A reduction in porous tube water pressure to -2-0 kPa resulted in significant reductions in sap flow, leaf conductance, and soil, root and leaf water potentials. Hydraulic conductance, calculated as the transpiration rateiAy/ between two points in tbe water transport patbway, was used to analyse water transport through the tube-soil-plant continuum. At porous tube water pressures of-0-5 to -1'5 kPa soil moisture was readily available and bydraulic conductance of tbe plant limited water transport. At -2-0 kPa, hydraulic conductance of the bulk soil was the dominant factor in water movement.

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Section: Plant Water Use and Water Statusmentioning

confidence: 82%

Response of the water status of soybean to changes in soil water potentials controlled by the water pressure in microporous tubes

Steinberg

Henninger

1997

Plant Cell & Environment

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“…Our cut leaves had a wound surface area to leaf volume ratio of 1 to 2 cm2/cm3 of tissue. This amount of wounding is quite small and indeed if the leaf tissue were sunflower or pepper, we would not expect to find a deviation (2,6). The fact that water potentials measured Can.…”

Section: Tl7e Effects Of Cutting Leavesmentioning

confidence: 89%

Some notes concerning the measurement of water potentials of leaf tissue with specific reference to Tsuga canadensis and Picea abies

Talbot¹,

Tyree²,

Dainty³

1975

Can. J. Bot.

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Psychrometric measurements of the water potentials of leaves of Tsuga canadensis (L.) Carr. and Picea abies L. are compared with the water potentials of the shoots from which they came as measured by the pressure-bomb technique. Agreement between the two techniques is good when whole leaves are used in the psychrometer chamber, but deviations occur when bisected leaves are used in which the wound area to tissue volume is very small (1 to 2 cm2/cm3 of leaf tissue). Psychrometer determinations of water potential of these detached leaves are much more sensitive to cutting than in other species, e.g., sunflower and pepper (2). A more reliable means of measuring turgor and osmotic pressures in leaves is proposed.

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“…Boyer (1967) and Boyer and Ghorashy (1971) demonstrated that the quantitative relationship between the xylem water potential and the balance pressure is valid only when the system is at equilibrium. The polyethylene bag and its moist lining were then removed from the leaf and the chamber was sealed.…”

Section: Xylem Pressrrre Potentirilmentioning

confidence: 99%

“…However, because they require a close temperature control and elaborate instrumentation, their use in plant water relation studies is restricted primarily to the laboratory. Comparisons of the pressure chamber measurements with thermocouple psychrometer measurements (Boyer and Ghorashy 1971;Blum et (11. Comparisons of the pressure chamber measurements with thermocouple psychrometer measurements (Boyer and Ghorashy 1971;Blum et (11.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the pressure chamber technique for measurement of leaf water potential in cassava (Manihot species)

Ike¹,

Thurtell²,

Stevenson³

1978

Can. J. Bot.

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The pressure chamber technique was evaluated as a method for estimating leaf water potential in cassava (Manihot esculenta Crantz). Xylem pressure potentials (ψP) measured with the pressure chamber were compared with leaf water potential (ψL) obtained for the same leaf with the in situ dew-point hygrometer.In both cassava varieties studied, ψL and ψP were linearly related (r2 = 0.87 and 0.98 for CMC9 and CMC40 respectively). The length of petiole exposed outside the chamber affects the relation between ψL and ψP and should be kept at between 1 and 3 cm for better agreement. In CMC40, ψP was consistently lower (drier) than ψL by about 1.0 bar (1 bar = 100 kPa) in the entire range of water potential studied, but was not the case in CMC9. The reason for this difference is unclear but may be due to a filling of tissues other than xylem tissues (Boyer 1967) during the measurement of ψP in CMC40. Average xylem osmotic potentials (ψS) were low (−1.0 ± 0.2 bars and −1.0 ± 0.4 bars for CMC9 and CMC40 respectively). It is, therefore, unnecessary to correct for ψS when using the pressure chamber to estimate leaf water potentials in cassava.

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Rapid Field Measurement of Leaf Water Potential in Soybean¹

Cited by 26 publications

References 3 publications

Response of the water status of soybean to changes in soil water potentials controlled by the water pressure in microporous tubes

Response of the water status of soybean to changes in soil water potentials controlled by the water pressure in microporous tubes

Some notes concerning the measurement of water potentials of leaf tissue with specific reference to Tsuga canadensis and Picea abies

Evaluation of the pressure chamber technique for measurement of leaf water potential in cassava (Manihot species)

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Rapid Field Measurement of Leaf Water Potential in Soybean1

Cited by 26 publications

References 3 publications

Response of the water status of soybean to changes in soil water potentials controlled by the water pressure in microporous tubes

Response of the water status of soybean to changes in soil water potentials controlled by the water pressure in microporous tubes

Some notes concerning the measurement of water potentials of leaf tissue with specific reference to Tsuga canadensis and Picea abies

Evaluation of the pressure chamber technique for measurement of leaf water potential in cassava (Manihot species)

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Rapid Field Measurement of Leaf Water Potential in Soybean¹