Leaf Temperature Effects on Measurements of Diffusive Resistance to Water Vapor Transfer

Morrow, P. A.; Slatyer, R. O.

doi:10.1104/pp.47.4.559

Cited by 42 publications

(8 citation statements)

References 9 publications

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“…1992). Nevertheless, there are many sources of error in all such techniques involving gas exchange, and error in the measurement of leaf temperature is still probably the most common and significant (Morrow & Slatyer 1971; Mott & Peak 2011).…”

Section: Discussionmentioning

confidence: 99%

Ternary effects on the gas exchange of isotopologues of carbon dioxide

Farquhar

Cernusak

2012

Plant Cell & Environment

176

263

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The ternary effects of transpiration rate on the rate of assimilation of carbon dioxide through stomata, and on the calculation of the intercellular concentration of carbon dioxide, are now included in standard gas exchange studies. However, the equations for carbon isotope discrimination and for the exchange of oxygen isotopologues of carbon dioxide ignore ternary effects. Here we introduce equations to take them into account. The ternary effect is greatest when the leaf-toair vapour mole fraction difference is greatest, and its impact is greatest on parameters derived by difference, such as the mesophyll resistance to CO2 assimilation, rm. We show that the mesophyll resistance to CO2 assimilation has been underestimated in the past. The impact is also large when there is a large difference in isotopic composition between the CO2 inside the leaf and that in the air. We show that this partially reconciles estimates of the oxygen isotopic composition of CO2 in the chloroplast and mitochondria in the light and in the dark, with values close to equilibrium with the estimated oxygen isotopic composition of water at the sites of evaporation within the leaf.

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Section: Discussionmentioning

confidence: 99%

Ternary effects on the gas exchange of isotopologues of carbon dioxide

Farquhar

Cernusak

2012

Plant Cell & Environment

176

263

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“…During the drying cycle, and following re-irrigation, leaf water potential, conductance, and photosynthesis were measured on three or four randomly selected plants in each treatment at 3 h intervals each day during the light period. Adaxial leaf conductance to water vapour (gj cm~^ s~^) was measured with an unventilated diffusion' porometer sensor (LI-COR model 205) connected to an autoporometer(LI-CORmodel65, LI-COR, Lincoln, NE, USA) using procedures outlined by Kanemasu, Thurtell & Tanner (1969) and observing precautions of Morrow & Slatyer (1971). Photosynthesis measurements were completed using instruments and techniques of Michaels et al (1985).…”

Section: Plant and Environmental Measurementsmentioning

confidence: 99%

“…Adaxial leaf conductance to water vapour (gj cm~^ s~^) was measured with an unventilated diffusion' porometer sensor (LI-COR model 205) connected to an autoporometer(LI-CORmodel65, LI-COR, Lincoln, NE, USA) using procedures outlined by Kanemasu, Thurtell & Tanner (1969) and observing precautions of Morrow & Slatyer (1971). Photosynthesis measurements were completed using instruments and techniques of Michaels et al (1985).…”

Section: Plant and Environmental Measurementsmentioning

confidence: 99%

GROWTH, NUTRITION AND GAS EXCHANGE OF BROMUS INERMIS INOCULATED WITH GLOMUS FASCICULA TUM

et al. 1986

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SUMMARYPlants of Broinus inermis Leyss. inoculated or not with the mycorrhizal fungus Glomus fasciculatum (Thaxter sensu. Gerd.) Gerd. and Trappe, were pre-conditioned at two soil moisture levels (^^ -0-03 or -0-8 MPa) for 17 weeks, then subjected to a drying cycle. Stomatal conductance C?i), soil-plant liquid Bow resistance (i?s-p). ""d photosynthesis rates (P^ were measured before, during, and after the drying cycle. Soil water stress and mycorrbizal inoculation significantly reduced plant top dry weight during the 18 week study. Chlamydospore production by the mycorrhizal symbiont G. fascicutatum was significantly increased by soil water stress of -08 MPa. Foliar Ca and Mg concentrations were significantly greater in mycorrhizal plants. Foliar concentrations of P, K, N, Mn, Zn and Cu were significantly greater in drought stressed plants whereas Ca and Mg concentrations were significantly greater in well-watered plants.Mycorrhizal plants pre-conditioned at 4^^ -08 MPa had 36 and 34 "o lower Rg-ti values than nonmycorrhizal plants at pre and peak drought sampling times, respectively. Following re-irrigation, g^ was 64% greater in mycorrhizal plants when compared to nonmycorrhizal plants. Inoculation with G. fasciculatum increased photosynthesis rates by 20, 52, and 22 % over the noninoculated plants before, during, and after the drying cycle respectively. Despite increased rates of photosynthesis, top dry weight of mycorrhizal plants was IS % less than that of noninoeulated plants.Regardless of inoculation treatment, plants pre-conditioned at ^^ -0 8 MPa exhibited greater gj and Pg values during and after the drying cycle. Bromtis inermis demonstrated the ability to adapt to water deficits. Mycorrhizal symbiosis may play a role in the adaptation of B. inermis to dry sites.

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“…Fig. 5 shows, that not only the accuracy of the leaf temperature measurement is of importance for the determination of the water vapour diffusion resistance (Morrow and Slatyer, 1971;Slatyer, 1971), but the accuracy of the absolute humidity measurement and transpiration rate determination is even more significant.…”

Section: D) Errors O/transpiration Measurement and Calculationmentioning

confidence: 99%

“…However, little attention has been directed to the additional errors of digital data recording systems as well as the errors resulting from subsequent calculations (Eckardt, 1966;Cernusca and Moser, 1969;Kiese and Surkow, 1971) despite the recognized importance of overall errors in the interpretation of the results (Morrow and Slatyer, 1971;Slatyer, ~971;Tranquillini and Caldwell, 1972). We will therefore describe the ~ eration of a digital data handling system used in conjunction with gemperature-and humidity-controlled plant cuvettes for C02 exchange and transpiration measurements (Lange et al, 1969;Koch et al, 1971).…”

mentioning

confidence: 98%

A digital registration system for net photosynthesis and transpiration measurements in the field and an associated analysis of errors

1972

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A digital registration system used with temperature- and humidity-controlled cuvettes for net photosynthesis and transpiration measurements in the field is described. The associated errors of the measured parameters and calculated data are estimated. The digitalization is based on an analogue registration which is of primary importance in the control of experimental conditions in the cuvettes. The digital system is connected to the analogue registration in series. The error associated with digitalization is 0.1% across 70% of the scale. This error increases to 0.2% between 3 and 30% on the scale due to a minor lack of linearity. The reproducibility of the digitalization is ±0.024%.The error associated with data transfer in the digitalization and the errors of the analogue registration are estimated for temperature and humidity measurements (error of air and leaf temperature is ±0.1° C; error of the dew point temperature is ±1.1° C dew point). The effect of these errors on the calculation of relative humidity and the water vapour difference between the leaf and the air is determined using the progressive error law. At 30° C and 50% relative humidity, the error in relative humidity is ±7.4%, the error for the water vapour difference is ±6.6%. The dependence of these errors on temperature and humidity is shown.The instrument error of the net photosynthesis measurement is calculated to be ±4.2%. Transpiration measurements have an average inaccuracy of ±8.3%. The total diffusion resistance which is calculated from values of transpiration and the water vapour difference has an average error of ±10.9%. The sizeable influence of errors in humidity and temperature measurements on the calculated diffusion resistance is demonstrated. The additional influence of biological errors associated with field measurements is discussed.

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Leaf Temperature Effects on Measurements of Diffusive Resistance to Water Vapor Transfer

Cited by 42 publications

References 9 publications

Ternary effects on the gas exchange of isotopologues of carbon dioxide

Ternary effects on the gas exchange of isotopologues of carbon dioxide

GROWTH, NUTRITION AND GAS EXCHANGE OF BROMUS INERMIS INOCULATED WITH GLOMUS FASCICULA TUM

A digital registration system for net photosynthesis and transpiration measurements in the field and an associated analysis of errors

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