Summary
Previously we reported that leaf conductance of cowpea (Vigna unguiculata) decreased with small changes in soil water status without associated changes in leaf water status. In these studies a larger range of soil water deficits was imposed in a rain-free environment by prolonged soil drying, and by weekly irrigation with different amounts of water. With progressive soil water deficits, leaf conductance and xylem pressure potential both declined, but in a manner which indicated that they were not related. Diurnal courses of leaf conductance usually indicated that stomatal opening occurred in the morning, and partial or complete stomatal closure occurred during midday and afternoon. This stomatal closure was associated with increases in air vapor pressure deficit. Day-to-day increases in leaf conductance, at times when radiation was not limiting stomatal opening, were associated with decreases in air vapor pressure deficits. However, maximum leaf conductances and their responses to vapor pressure deficit were generally smaller for plants subjected to greater depletion of soil water.
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Bates LM, Hall AE (1982) Relationships between leaf water status and transpiration of cowpea with progressive soil drying. Oecologia 53:285–289
Bates LM, Hall AE (1981) Stomatal closure with soil water depletion not associated with changes in bulk leaf water status. Oecologia 50:62–65
Cowan IR, Farquhar GD (1977) Stomatal function in relation to leaf metabolism and environment. In: DH Jennings (ed), Integration of activity in the higher plant. Cambridge University Press, London p 471–505
Ehling CF, Gardner WR (1964) Relationship between transpiration and the internal water relations of plants. Agron J 56:127–130
Hall AE (1982) Mathematical models of plant water loss and plant water relations. In: OL Lange, PS Nobel, CB Osmond, H Ziegler (eds.), Encyclopedia of Plant Physiology; Physiological plant ecology. Vol B, Water relations and photosynthetic productivity. Springer-Verlag, Berlin-Heidelberg-New York
Hall AE, Grantz DA (1981) Drought resistance of cowpea improved by selecting for early appearance of mature pods. Crop Sci 21:461–464
Hall AE, Hoffman GJ (1976) Leaf conductance response to humidity and water transport in plants. Agron J 68:876–881
Hall AE, Schulze E-D (1980) Stomatal response to environment and a possible interrelation between stomatal effects on transpiration and CO2 assimilation. Plant, Cell and Environ 3:467–474
Hall AE, Schulze E-D, Lange OL (1976) Current perspectives of steady-state stomatal responses to environment. In: OL Lange, L Kappen, E-D Schulze (eds), Ecological studies. Analysis and synthesis. Vol 19, Water and plant life. Springer-Verlag, Berlin-Heidelberg-New York, p 169–188
Hsiao TC (1973) Plant responses to water stress. Ann Rev Plant Physiol 24:519–570
Jones MM, Rawson HM (1979) Influence of rate of development of leaf water deficits upon photosynthesis, leaf conductance, water use efficiency, and osmotic potential in sorghum. Physiol Plant 45:103–111
Ludlow MM (1980) Adaptive significance of stomatal responses to water stress. In: NC Turner, PJ Kramer (eds). Adaptation of plants to water and high temperatures stress, Wiley-Interscience, New York-Chichester-Brisbane-Toronto, p 123–138
Running SW (1976) Environmental control of leaf water conductance in conifers. Can J For Res 6:104–112
Running SW (1980) Environmental and physiological control of water flux through Pinus contorta. Can J For Res 10:82–91
Schulze E-D, Hall AE (1982) Stomatal responses, water loss and CO2 assimilation rates of plants in contrasting environments. In: OL Lange, PS Nobel, CB Osmond, H Ziegler (eds) Encyclopedia of Plant Physiology; Physiological plant ecology. Vol B, Water relations and photosynthetic productivity. Springer-Verlang, Berlin-Heidelberg-New York
Schulze E-D, Küppers M (1979) Short-term and long-term effects of plant water deficits on stomatal response to humidity in Corylus avellana L. Planta 146:319–326
Schulze E-D, Lange OL, Evenari M, Kappen L, Buschbom U (1974) The role of air humidity and leaf temperature in controlling stomatal resistance of Prunus armeniaca L. under desert conditions. I. A simulation of the daily course of stomatal resistance. Oecologia 17:159–170
Turk KJ, Hall AE, Asbell CW (1980) Drought adaptation of cowpea. I. Influence of drought on seed yield. Agron J 72:413–420
Turk KJ, Hall AE (1980) Drought adaptation of cowpea. II. Influence of drought on plant water status and relations with seed yield. Agron J 72:434–439
Turner NC, Begg JE (1978) Responses of pasture plants to water deficits. In: JR Wilson (ed) Plant relations in pastures, CSIRO, Melbourne, Australia p 50–66
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Bates, L.M., Hall, A.E. Diurnal and seasonal responses of stomatal conductance for cowpea plants subjected to different levels of environmental drought. Oecologia 54, 304–308 (1982). https://doi.org/10.1007/BF00379997
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DOI: https://doi.org/10.1007/BF00379997