Stomatal sensitivity to carbon dioxide and humidity: a comparison of two c(3) and two c(4) grass species.

The sensitivity of stomatal conductance to changes of CO(2) concentration and leaf-air vapor pressure difference (VPD) was compared between two C(3) and two C(4) grass species. There was no evidence that stomata of the C(4) species were more sensitive to CO(2) than stomata of the C(3) species. The sensitivity of stomatal conductance to CO(2) change was linearly proportional to the magnitude of stomatal conductance, as determined by the VPD, the same slope fitting the data for all four species. Similarly, the sensitivity of stomatal conductance to VPD was linearly proportional to the magnitude of stomatal conductance. At small VPD, the ratio of intercellular to ambient CO(2) concentration, C(i)/C(a), was similar in all species (0.8-0.9) but declined with increasing VPD, so that, at large VPD, C(i)/C(a) was 0.7 and 0.5 (approximately) in C(3) and C(4) species, respectively. Transpiration efficiency (net CO(2) assimilation rate/transpiration rate) was larger in the C(4) species than in the C(3) species at current atmospheric CO(2) concentrations, but the relative increase due to high CO(2) was larger in the C(3) than in the C(4) species.

[1]  P. Jarvis,et al.  Direct and indirect effects of light on stomata II. In Commelina communis L. , 1983 .

[2]  M. Strand,et al.  Photosynthetic responses to low temperature in Betula pubescens and Betula tortuosa , 1982 .

[3]  T. Sharkey,et al.  Stomatal conductance and photosynthesis , 1982 .

[4]  T. Sharkey,et al.  Separation and measurement of direct and indirect effects of light on stomata. , 1981, Plant physiology.

[5]  A. E. Hall,et al.  Stomatal response to environment and a possible interrelation between stomatal effects on transpiration and CO2 assimilation , 1980 .

[6]  W. Louwerse.  Effects of CO2 concentration and irradiance on the stomatal behaviour of maize, barley and sunflower plants in the field , 1980 .

[7]  C. Osmond,et al.  Physiological Processes in Plant Ecology: Toward a Synthesis with Atriplex , 1980 .

[8]  I. R. Cowan,et al.  Stomatal conductance correlates with photosynthetic capacity , 1979, Nature.

[9]  I. R. Cowan,et al.  Leaf Conductance in Relation to Assimilation in Eucalyptus pauciflora Sieb. ex Spreng: Influence of Irradiance and Partial Pressure of Carbon Dioxide. , 1978, Plant physiology.

[10]  G. Farquhar,et al.  Effect of abscisic Acid on the gain of the feedback loop involving carbon dioxide and stomata. , 1978, Plant physiology.

[11]  G. Farquhar,et al.  Gain of the feedback loop involving carbon dioxide and stomata: theory and measurement. , 1978, Plant physiology.

[12]  D. W. Sheriff.  The Effect of Humidity on Water Uptake by, and Viscous Flow Resistance of, Excised Leaves of a Number of Species: Physiological and Anatomical Observations , 1977 .

[13]  M. Kaufmann,et al.  Stomatal Response to Environment with Sesamum indicum. L. , 1975, Plant physiology.

[14]  D. N. Moss,et al.  Differential Stomatal Response Between C3 and C4 Species to Atmospheric CO2 Concentration and Light1 , 1972 .

[15]  D. Koller,et al.  INTERACTIONS OF CARBON DIOXIDE CONCENTRATION, LIGHT INTENSITY AND TEMPERATURE ON PLANT RESISTANCES TO WATER VAPOUR AND CARBON DIOXIDE DIFFUSION , 1967 .

[16]  J. E. Pallas.  Transpiration and Stomatal Opening with Changes in Carbon Dioxide Content of the Air , 1965, Science.

[17]  R. Gifford.  Global photosynthesis in relation to our food and energy needs. , 1982 .

[18]  S. Pallardy.  CHAPTER 8 – CLOSELY RELATED WOODY PLANTS , 1981 .

[19]  J. Radin.  Water Relations of Cotton Plants under Nitrogen Deficiency: III. STOMATAL CONDUCTANCE, PHOTOSYNTHESIS, AND ABSCISIC ACID ACCUMULATION DURING DROUGHT. , 1981, Plant physiology.

[20]  Graham D. Farquhar,et al.  Responses to Humidity by Stomata of Nicotiana glauca L. And Corylus avellana L. Are Consistent With the Optimization of Carbon Dioxide Uptake With Respect to Water Loss , 1980 .

[21]  I. R. Cowan.  Stomatal Behaviour and Environment , 1978 .

[22]  R. Gifford.  A Comparison of Potential Photosynthesis, Productivity and Yield of Plant Species with Differing Photosynthetic Metabolism , 1974 .

[23]  M. Ludlow,et al.  Photosynthesis of tropical pasture plants i. illuminance, carbon dioxide concentration, leaf temperature, and leaf-air vapour pressure difference , 1971 .