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United States Department of Agriculture

Agricultural Research Service

Dr. James Bunce
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Click here for Contact Info, Current Projects, and Recent Publications

 Birth U.S. Citizen

 Research Interests

Environmental physiology of plants, especially water relations, photosynthesis and global change.
Education

Ph.D. Cornell University, 1975

Major: Physiological Ecology

Minors: Plant Physiology, Terrestrial Ecology

B.S. Bates College, 1971, Biology and Chemistry

Honors & Awards

Phi Beta Kappa, 1971

B.S. cum laude, with honors in Chemistry

Sigma Xi, 1975

Sustained Superior Service Award, 1989

Superior Achievement Award, 1991,1995,1996

Federal Women’s Program Impact Award, 1992

Outstanding Performance Award, 1992, 1998, 2000

Professional Societies

American Society of Plant Physiologists
Ecological Society of America
American Association for the Advancement of Science

Experience

2000 to present: Physiological Ecologist in the Plant Science Institute, USDA-ARS, Beltsville MD

1990 to 2000: Physiological Ecologist in the Climate

Stress Laboratory, USDA-ARS, Beltsville, MD

1977 to 1990: Physiological Ecologist in the Plant

Photobiology Laboratory, USDA-ARS, Beltsville, MD

1975-1977: Post-doctoral research associate with Dr. P. J.

Kramer, Duke University

 

Bunce, J. A., L. N. Miller. 1976. Differential effects of water stress on respiration in the light in woody plants from wet and dry habitats. Can. J. Bot. 54: 2457-2464.

Bunce, J. A. 1977. Leaf elongation in relation to leaf water potential in soybeans. J. Exp. Bot. 28: 158-163.

Bunce, J. A., L. N. Miller, B. F. Chabot. 1977. Competitive exploitation of soil water by five eastern North American tree species. Bot. Gaz. 138: 168-173.

Bunce, J. A. 1977. Non-stomatal inhibition of photosynthesis at low leaf water potentials in intact leaves of species from a variety of habitats. Pl. Physiol. 59: 348-350.

Patterson, D. T., J. A. Bunce, R. S. Alberte, E. VanVolkenburg. 1977. Photosynthesis in relation to leaf characteristics of cotton from controlled and field environments. Pl. Physiol. 59: 384-387.

Warrington, I. J., M. M. Peet, D. T. Patterson, J. A. Bunce, R. M. Haslemore, H. Hellmers. 1977. Growth and physiological responses of soybean under various thermoperiods. Austral. J. Pl. Physiol. 40: 371-380.

Patterson, D. T., M. M. Peet, J. A. Bunce. 1977. The effect of photoperiod and size at flowering on vegetative growth and seed yield of soybean. Agron. J. 69: 631-635.

Bunce, J. A., D. T. Patterson, M. M. Peet, R. S. Alberte. 1977. Light acclimation during and after leaf expansion in soybeans. Pl. Physiol. 60: 255-258.

Bunce, J. A. 1978. Effects of shoot environment on apparent root resistance to water flow in whole soybean and cotton plants. J. Exp. Bot. 29: 595-601.

Bunce, J. A. 1978. Effects of water stress on leaf expansion, net photosynthesis, and vegetative growth in soybeans and cotton. Can. J. Bot. 56: 1492-1498.

Bunce, J. A. 1978. Interrelationships of diurnal expansion rates and carbohydrate accumulation and movement in soya beans. Ann. Bot. 42: 1463-1466.

Chabot, B. F., J. A. Bunce. 1979. Drought stress effects on leaf carbon balance. in O. T. Solbrig, S. Jain, G. B. Johnson, P. H. Raven, eds. Topics in Plant Population Biology. Columbia Univ. Press, N. Y. pp. 338-355. (review article)

Snyder, F. W., G. E. Carlson, J. E. Silvius, J. A. Bunce. 1979. Selecting for taproot to leaf-weight ratio and its effect on yield and physiology. J. Am. Soc. S. Beet Technol. 20: 386-398.

Bunce, J. A., B. F. Chabot, L. N. Miller. 1979. Role of annual leaf carbon balance in the distribution of plants species along an elevational gradient. Bot. Gaz. 140: 288-294.

Bunce, J. A. 1981. Relationships between maximum photosynthetic rates and photosynthetic tolerance of low leaf water potentials. Can. J. Bot. 59: 769-774.

Bunce, J. A. 1981. Comparative responses of leaf conductance to humidity in single attached leaves. J. Exp. Bot. 32: 629-634.

Bunce, J. A. 1982. Effects of water stress on photosynthesis in relation to diurnal accumulation of carbohydrates in source leaves. Can. J. Bot. 60: 195-200.

Bunce, J. A. 1982. Low humidity effects on photosynthesis in single leaves of C4 plants. Oecol. 54: 233-235.

Bunce, J. A. 1982. Photosynthesis at ambient and elevated humidity over a growing season in soybean. Photosyn. Res. 3: 307-311.

Bunce, J. A. 1983. Photosynthetic characteristics of leaves developed at different irradiances and temperatures: an extension of the current hypothesis. Photosyn. Res. 4: 87-97.

Bunce, J. A. 1983. Differential sensitivity to humidity of daily photosynthesis in the field in C3 and C4 species. Oecol. 57: 262-265.

Snyder, F. W., J. A. Bunce. 1983. Use of the plastochron index to evaluate effects of light, temperature and nitrogen on growth of soya bean (Glycine max L. Merr.). Ann. Bot. 52: 895-903.

Swietlik, D., J. A. Bunce, S. S. Miller. 1984. Effect of foliar application of mineral nutrients on stomatal aperture and photosynthesis in apple seedlings. J. Am. Soc. Hort. Sci. 109: 306-312.

Bunce, J. A. 1984. Effects of humidity on photosynthesis. J. Exp. Bot. 35: 1245-1251.

Bunce, J. A. 1984. Identifying soybean lines differing in gas exchange sensitivity to humidity. Ann. Appl. Biol. 105: 313-318.

Bunce, J. A. 1985. Effects of day and night temperature and temperature variation on photosynthetic characteristics. Photosyn. Res. 6: 175-181.

Bunce, J. A. 1985. Effects of weather during leaf development on photosynthetic characteristics of soybean leaves. Photosyn. Res. 6: 215-220.

Bunce, J. A. 1985. Effect of boundary layer conductance on the response of stomata to humidity. Plant, Cell and Environ. 8: 55-58.

Krizek, D. T., A. Carmi, R. M. Mirecki, F. W. Snyder, J. A. Bunce. 1985. Comparative effects of soil moisture stress and restricted root zone volume on morphogenetic and physiological responses of soybean [Glycine max (L) Merr]. J. Exp. Bot. 36: 25-38.

Bunce, J. A., D. A. Ward. 1985. Errors in differential infrared carbon dioxide analysis resulting from water vapor. Photosyn. Res. 6: 289-294.

Bunce, J. A., D. A. Ward. 1986. Source-sink balance as a factor in photosynthetic acclimatization. in R. Marcelle, H. Clijsters, M. VanPoucke, eds. Biological Control of Photosynthesis. Martinus Nijhoff Publishers., Dordrecht, Netherlands. pp. 241-250 (review article)

Bunce, J. A. 1986. Measurements and modeling of photosynthesis in field crops. Crit. Rev. in Plant Sci. 4: 47-77. (review article)

Bunce, J. A. 1986. Volume and osmotic potential changes in relation to inhibition of photosynthesis by water stress in intact leaves. Can. J. Bot. 64: 557-560.

Ward, D. A., J. A. Bunce. 1986. Novel evidence for a lack of water vapour saturation within the intercellular airspace of turgid leaves of mesophytic species. J. Exp. Bot. 37: 504-516.

Ward, D. A., J. A. Bunce. 1986. The control of the light acclimation of photosynthesis in Glycine max: dependence on import as modified by intraplant shading. J. Exp. Bot. 37: 615-624.

Ward, D. A., J. A. Bunce. 1986. Responses of net photosynthesis and conductance to independent changes in the humidity environments of the upper and lower surfaces of leaves of sunflower and soybean. J. Exp. Bot. 37: 1842-1843.

Bunce, J. A. 1986. Responses of gas exchange to humidity in populations of three herbs from environments differing in atmospheric water. Oecol. 71: 117-120.

Bunce, J. A. 1987. Species-specific responses to water stress of gas exchange parameters mimicked by applied abscisic acid. Can. J. Bot. 65: 103-106.

Ward, D. A., J. A. Bunce. 1987. Abscisic acid simultaneously decreases carboxylation efficiency and quantum yield in attached soybean leaves. J. Exp. Bot. 38: 1182-1192.

Bunce, J. A. 1987. In-phase cycling of photosynthesis and conductance at saturating carbon dioxide pressure induced by increases in water vapour pressure deficit. J. Exp. Bot. 38: 1413-1420.

Sicher, R. C., J. A. Bunce. 1987. Effects of light and CO2 on fructose 2,6-bisphosphate levels in barley primary leaves. Pl. Physiol. Biochem. 25: 525-530.

Bunce, J. A. 1988. Mutual shading and the photosynthetic capacity of exposed leaves of field grown soybeans. Photosyn. Res. 15: 75-83.

Bunce, J. A. 1988. Differential responses of photosynthesis to water stress in three soybean cultivars. Pl. Physiol. Biochem. 26: 415-420.

Caulfield, F., J. A. Bunce. 1988. Comparative responses of photosynthesis to growth temperature in soybean (Glycine max L. Merril) cultivars. Can. J. Pl. Sci. 68: 419-425.

Bunce, J. A. 1988. Effects of boundary layer conductance on substomatal pressures of carbon dioxide. Plant, Cell and Environ. 11: 205-208.

Bunce, J. A. 1988. Nonstomatal inhibition of photosynthesis by water stress. Reduction in photosynthesis at high transpiration rate without stomatal closure in field-grown tomato. Photosyn. Res. 18: 357-362.

Woledge, J., J. A. Bunce and V. Tewson. 1989. The effect of air humidity on photosynthesis of ryegrass and white clover at three temperatures. Ann. Bot. 63: 271-279.

Bunce, J. A. 1989. Growth rate, photosynthesis and respiration in relation to leaf area index. Ann. Bot. 63: 459-463.

Bunce, J. A. 1989. Water stress as an almost everyday phenomenon. Proc. World Soybean Res. Conf. IV: vol. I: 232-237.

Bunce, J. A. 1990. The effect of leaf size on mutual shading and cultivar differences in soybean leaf photosynthetic capacity. Photosyn. Res. 23: 67-72.

Bunce, J. A. 1990. Abscisic acid mimics effects of dehydration on area expansion and photosynthate partitioning in young soybean leaves. Pl. Cell and Environ. 13: 295-298.

Bunce, J. A. 1990. Short- and long-term inhibition of respiratory carbon dioxide efflux by elevated carbon dioxide. Ann. Bot. 65: 637-642.

Bunce, J. A. 1990. Afternoon inhibition of photosynthesis in maize. 1. Evidence and relationship to stand density. Field Crops Res. 24: 251-260.

Bunce, J. A. 1990. Afternoon inhibition of photosynthesis in maize. 2. Environmental causes and physiological symptoms. Field Crops Res. 24: 261-271.

Caulfield, F. and J. A. Bunce. 1991. Influence of environment during seed development on the morphology and growth rate of soybean seedlings. Bot. Gaz. 152: 59-63.

Bunce, J. A. and F. Caulfield. 1991. Reduced respiratory carbon dioxide efflux during growth at elevated carbon dioxide in three herbaceous perennial species. Ann. Bot. 67: 325-330.

Bunce, J. A. 1991. Control of the acclimation of photosynthesis to light and temperature in relation to partitioning of photosynthate in developing soybean leaves. J. Exp. Bot. 42: 853-859.

Carlson, T. N. and J. A. Bunce. 1991. The effect of atmospheric carbon dioxide doubling on transpiration. Proc. Tenth Conf. on Biometeorol. and Aerobiol. and the Special Session on Hydrometeorol. pp. 196-199.

Bunce, J. A. 1992. Stomatal conductance, photosynthesis and respiration of temperate deciduous tree seedlings grown outdoors at an elevated concentration of carbon dioxide. Pl. Cell and Environ. 15:541-549.

Bunce, J. A. 1992. Light, temperature and nutrients as factors in photosynthetic adjustment to an elevated concentration of carbon dioxide. Physiol. Plant. 86:173-179.

Caulfield, F, Britz, S. J. and J. A. Bunce. 1992. Shade spectral quality and the photosynthetic capacity of soybean leaves. Photosynthetica 26: 555-562.

Bunce, J. A. 1993. Effects of doubled atmospheric carbon dioxide concentration on the responses of assimilation and conductance to humidity. Pl. Cell and Environ 16: 189-197.

Ziska, L. H. and J. A. Bunce. 1993. Inhibition of whole plant respiration by elevated CO2 as modified by growth temperature. Physiol. Pl. 87: 459-466.

Ziska, L. H. and J. A. Bunce. 1993. The influence of elevated CO2 and temperature on seed germination and emergence from soil. Field Crops Res. 34: 147-157.

Stanghellini, C. and J. A. Bunce. 1993. Response of photosynthesis and conductance to light, CO2, temperature and humidity in tomato plants acclimated to ambient and elevated CO2. Photosynthetica 29: 487-497.

Bunce, J. A. 1993. Growth, survival, competition, and canopy carbon dioxide and water vapor exchange of first year alfalfa at an elevated carbon dioxide concentration. Photosynthetica 29: 557-565.

Bunce, J. A. 1993. Responses of photosynthesis to increasing concentrations of carbon dioxide in the atmosphere. Current Adv. Bot. Res. 1: 91-100. (review article)

Ziska, L. H. and J. A. Bunce. 1994. Direct and indirect inhibition of single leaf respiration by elelvated CO2: interaction with temperature. Physiol. Plant. 90: 130-138.

Wullschleger, S. D., Ziska, L. H. and J. A. Bunce. 1994. Respiratory responses of higher plants to atmospheric CO2 enrichment. Physiol. Plant. 90: 221-229. (review article)

Bunce, J. A. 1994. Responses of respiration to increasing atmospheric carbon dioxide concentrations. What’s New in Plant Physiology. Physiol. Plant. 90: 427-430.

Ziska, L. H. and J. A. Bunce. 1994. Increasing growth temperature reduces the stimulatory effect of elevated CO2 on photosynthesis or biomass in two perennial species. Physiol. Plantar. 91: 183-190.

Caulfield, F. and J. A. Bunce. 1994. Elevated atmospheric carbon dioxide concentration affects interactions between Spodoptera exigua (Lepidoptera: Noctuidae)larvae and two host plant species outdoors. Environmental Entomology 23: 999-1005.

Acock, M., J. A. Bunce and B. Acock. 1994. Effects of changing daylength on flower intiation and development in two soybean cultivars. Biotronics 23: 93-104.

Bunce, J. A. 1995. The effect of carbon dioxide on respiration of growing and mature soybean leaves. Pl. Cell and Environ. 18: 575-581.

Bunce, J. A. 1995. Effects of elevated carbon dioxide concentration in the dark on the growth of soybean seedlings. Ann. Bot. 75: 365-368.

Ziska, L. H. and Bunce, J. A. 1995. Growth and photosynthetic response of three soybean cultivars to simultaneous increases in growth temperature and CO2. Physiol. Plantar. 94: 575-584.

Bunce J. A. 1995. Long-term growth of alfalfa and orchard grass plots at elevated carbon dioxide. J. Biogeography 22: 341-348.

Carlson, T. N. and Bunce, J. A. 1996. Will a doubling of atmospheric carbon dioxide lead to an increase of a decrease in water consumption by crops? Ecol. Modelling 88: 241-246.

Bunce, J. A. 1996. Growth at elevated carbon dioxide concentration reduces hydraulic conductance in alfalfa and soybean. Global Change Biol. 2: 155-158.

Bunce, J. A. and Ziska, L. H. 1996. Responses of respiration to increases in carbon dioxide concentration and temperature in three soybean cultivars. Ann. Bot. 77: 507-514.

Bunce, J. A. 1996. Does transpiration control stomatal responses to water vapour pressure deficit? Pl. Cell and Environ. 19: 131-135.

Bunce, J. A. 1997. Variation in growth stimulation by elevated carbon dioxide in seedlings of some C3 crop and weed species. Global Change Biol. 3: 61-66.

Ziska, L. A. and Bunce, J. A. 1997. The role of temperature in determining the stimulation of CO2 assimilation at elevated carbon dioxide concentration in soybean seedlings. Physiol. Plantar. 100: 126-132.

Bunce, J. A., Wilson, K. B. and Carlson, T. N. 1997. The effect of doubled CO2 on water use by alfalfa and orchard grass: simulating evapotranspiration using canopy conductance measurements. Global Change Biol. 3: 81-87.

Sicher, R. C. and Bunce, J. A. 1997. Relationship of photosynthetic acclimation to changes of Rubisco activity in field-grown winter wheat and barley during growth in elevated carbon dioxide. Photosyn. Res. 52: 27-38.

Wilson, K. B. and Bunce, J. A. 1997. Effects of carbon dioxide concentration on the interactive effects of temperature and water vapour on stomatal conductance in soybean. Pl. Cell and Environ. 20: 230-238.

Ziska, L. H. and Bunce, J. A. 1997. Influence of increasing carbon dioxide concentration on the photosynthetic and growth stimalation of selected C4 crops and weeds. Photosyn. Res. 54: 199-208.

Bunce, J. A. and Ziska, L. H. 1998. Decreased hydraulic conductance in plants at elevated carbon doixide. Pl. Cell and Environ. 21: 121-126.

Bunce, J. A. 1998. Effects of humidity on short-term responses of stomatal conductance to an increase in carbon dioxide concentration. Pl. Cell and Environ. 21: 115-120.

Bunce, J. A. 1998. Effects of environment during growth on the sensitivity of leaf conductance to changes in humidity. Global Change Biol. 4 : 269-274.

Ziska, L. H. and Bunce, J. A. 1998. The influence of increasing growth temperature and CO2 concentration on the ratio of respiration to photosynthesis in soybean seedlings. Global Change Biol. 4: 637-643.

Sicher, R. C. and Bunce, J. A. 1998. Evidence that premature senescence affects photosynthetic decline of wheat flag leaves during growth in elevated carbon dioxide. Int. J. Pl. Sci. 159 : 798-804.

Bunce, J. A. 1998. The temperature dependence of the stimulation of photosynthesis by elevated carbon dioxide in wheat and barley. J. Exp. Bot. 49 : 1555-1561.

Ziska, L. H., Bunce, J. A. and Caulfield, F. 1998. Intraspecific variation in seed yield of soybean (Glycine max) in response to increased atmospheric carbon dioxide. Aust. J. Pl. Physiol. 25: 801-807.

Ziska, L. H. and Bunce, J. A. 1999. Effect of elvated carbon dioxide concentration at night on the growth and gas exchange of selected C4 species. Aust. J. Pl. Physiol. 26: 71-77.

Ziska, L. H., Sicher, R. C. and Bunce, J. A. 1999. The impact of elevated carbon dioxide on the growth and gas exchange of threee C4 species differing in CO2 leak rates. Physiol. Plantar. 105: 74-80.

Bunce, J. A. 1999. Leaf and root control of stomatal closure during drying in soybean. Physiol. Plantar. 106: 190-195.

Ziska, L. H., Teasdale, J. R. and Bunce, J. A. 1999. Future atmospheric carbon dioxide may increase tolerance to glyphosate. Weed Sci. 47: 608-615.

Sicher, R. C. And Bunce, J. A. 1999. Photosynthetic enhancement and conductance to water vapor of field-grown Solanum tuberosum (L.) in response to CO2 enrichment. Photosyn. Res. 62: 155-163.

Wilson, K. B., Carlson, T. N. and Bunce, J. A. 1999. Feedback significantly influences the simulated effect of CO2 on seasonal evapotranspiration from two agricultural species. Global Change Biol. 5: 903-917.

Bunce, J. A. and Ziska, L. H. 1999. Impact of measurement irradiance on acclimation of photosynthesis to elevated CO2 concentration in several plant species. Photosynthetica 37: 509-517.

Bunce, J. A. 2000. Acclimation of photosynthesis to temperature in eight cool and warm climate hervaceous C3 species: temperature dependence of parameters of a biochemical photosynthesis model. Photosyn. Res. 63: 59-67.

Robinson, J. M. and Bunce, J. A. 2000. Influence of drought-induced water stress on soybean and spinach leaf ascorbate-dehydroascorbate level and redox status. Int. J. Pl. Sci. 161: 271-279.

Bunce, J. A. 2000. Responses of stomatal conductance to light, humidity and temperature in winter wheat and barley grown at three concentrations of carbon dioxide in the field. Global Change Biol. 6: 371-382.

Bunce, J. A. 2000. Contrasting effects of carbon dioxide and irradiance on the acclimation of photosynthesis in developing soybean leaves. Photosynthetica 38: 83-89.

Ziska, L. H. and Bunce, J. A. 2000. Sensitivity of field-grown soybean to future atmospheric CO2: selection for improved productivity in the 21st century. Aust. J. Pl. Physiol. 27: 979-984.

Bunce, J. A. 2000. Acclimation to temperature of the response of photosynthesis to increased carbon dioxide concentration in Taraxacum officinale. Photosyn. Res. 64: 89-94.

Ziska, L. H., Bunce, J. A. and Caulfield, F. A. 2001. Rising atmospheric carbon dioxide and seed yield of soybean genotypes. Crop Sci. 41: 385-391.

Bunce, J. A. 2001. Direct and acclimatory responses of stomatal conductance to elevated carbon dioxide in four herbaceous crop species in the field. Global Change Biol. 7: 323-331. 

Bunce, J. A. 2001. Effects of prolonged darkness on the sensitivity of leaf respiration to carbon dioxide concentration in C3 and C4 species. Ann. Bot. 87: 463-468.

 

Sicher, R. C. and Bunce, J. A. 2001. Adjustments of net photosynthesis in Solanum tuberosum in response to reciprocal changes in ambient and elevated growth CO2 partial pressures.  Physiol. Plantar. 112: 55-61.

 

Bunce, J. A. and Sicher, R. C. 2001.  Water stress and day-to-day variation in apparent photosynthetic acclimation of field-grown soybeans to elevated carbon dioxide concentration.

Photosynthetica 39: 95-101.

 

Ziska, L.H., Ghannoum, O., Baker, J.T., Conroy, J., Bunce, J.A., Kobayashi, K., Okada, M. 2001.  A global perspective of ground level "ambient" carbon dioxide for assessing the response of plants to atmospheric CO2.  Global Change Biology 7: 789-79.

 

Bunce, J. A. 2001. Are annual plants adapted to the current atmospheric concentration of carbon dioxide?  International J. of Plant Sci. 162: 1261-1266.

 

Bunce, J. A. 2001. Seasonal patterns of photosynthetic response and acclimation to elevated carbon dioxide in field-grown strawberry.  Photosyn. Res. 68: 237-245.

 

Bunce, J. A. 2001. Weeds in a changing climate. British Crop Protection Council Proceedings 77: 109-118.

 

Bunce, J. A. 2001.  The response of soybean seedling growth to carbon dioxide concentration at night in different thermal regimes. Biotronics 30: 15-26.

 

Bunce, J. A. 2002.  Sensitivity of infrared water vapor analyzers to oxygen concentration and errors in stomatal conductance. Photosyn. Res. 71: 273-276.

 

Bunce, J. A. 2002.  Carbon dioxide concentration at night affects translocation from soybean leaves. Ann. Bot. 90: 399-403.

 

Bunce, J. A. 2003.  Effects of water vapor pressure difference on leaf gas exchange in potato and sorghum at ambient and elevated carbon dioxide under field conditions. Field Crops Res. 82: 37-47.

 

 

 


Last Modified: 7/24/2009