Some of the photosynthesis and respiration results are highlighted on this page. There are links to posters presented at various meetings, as well as to various papers which have been published.
- Respiratory responses often are described with the use of the Q10.
- Is the Q10 meaningful in expressing plant rersponses to long-term changes in temperature?
- Probably not nearly as useful as many people believe!
- Poster by Marc van Iersel and Lynne Seymour
- How does temperature affect photosynthesis, growth respiration and maintenance respiration of plants?
- This poster shows a case-study with marigolds.
- Light obviously affects plant growth, but exactly what effects does it have on photosynthesis, growth respiration, and maintenance respiration?
- Poster by Krishna Nemali and Marc van Iersel.
Leaf photosynthesis measurements often do not correlate well with plant growth. There are a variety of reasons for this:
- There are spatial diffences in leaf photosynthesis within a canopy
- There are temporal changes in leaf photosynthesis
- Respiratory losses of CO2can easily account for 50% of gross photosynthesis, yet root, stem, and fruit respiration are not accounted for in leaf photosynthesis measurements. Furthermore, if CO2 exchange is measured only in the light, there is no indication of how much CO2 is lost through dark respiration.
Continuous whole-plant (or â€“crop) CO 2 exchange measurements are a very powerful research tool, because they do not have these limitations, and are a direct indicator of plant growth. We have used this approach in many of our studies. Some of the reprints can be found below.
If you can’t access the reprints on-line, please send me an e-mail.
van Iersel, M.W. 2003. Carbon use efficiency depends on growth respiration, maintenance respiration, and relative growth rate. A case study with lettuce. Plant, Cell & Environment. In press.
Dumka, D., C.W. Bednarz , and M.W. van Iersel. 2003. Effect of flower bud removal on carbon dioxide exchange rates of cotton. Communications in Soil Science and Plant Analysis . In press.
Schwarz, D., H.-P. Kläring, M.W. van Iersel, and K.T. Ingram. 2002. Growth and photosynthetic response of tomato to nutrient solution concentration at two light levels. Journal of the American Society for Horticultural Science 127:984-990.
Miller, A.M., M.W. van Iersel, and A.M. Armitage. 2001. Whole plant CO2 exchange responses of Angelonia angustifolia to temperature and irradiance. Journal of the American Society for Horticultural Science 125:606-610.
Bednarz, C.W. and M.W. van Iersel. 2001. Temperature response of whole-plant CO 2 exchange rates of four upland cotton cultivars differing in leaf shape and leaf pubescence. Communications in Soil Science and Plant Analysis 32:2485-2501.
Klingeman, W.E., G.D. Buntin, M.W. van Iersel, and S.K. Braman. 2000. Whole-plant gas exchange, not individually leaf measurements, accurately assesses azalea response to insecticides. Crop Protection 19:407-415.
The following manuscripts are not available on-line, but you can get the reprints by sending me an e-mail.
van Iersel, M.W. and L.Seymour. 2000. Growth respiration, maintenance respiration, and carbon fixation of vinca [ Catharanthus roseus (L.) G.Don.]: a time series analysis. Journal of the American Society for Horticultural Science 125:702-706.
van Iersel, M.W. 2000. Post-production leaching affects the growing medium and respiration of subirrigated poinsettias. HortScience 35:250-253.
van Iersel, M.W. and B.Bugbee. 2000. A semi-continuous, multi-chamber crop CO 2 -exchange system: design, calibration, and data interpretation. Journal of the American Society for Horticultural Science 125:86-92.
van Iersel, M.W. 1999. Auxin applications affect post-transplant CO 2 exchange rate and growth of bare-rooted vinca [ Catharanthus roseus (L.) G. Don] seedlings. Journal of the American Society for Horticultural Science 124:234-238.
van Iersel, M.W. and O.M.Lindstrom . 1999. Temperature response of whole plant CO 2 exchange rates of three magnolia ( Magnolia grandiflora L.) cultivars. Journal of the American Society for Horticultural Science 124:277-282.
van Iersel, M.W. and B.Bugbee. 1997. Dibutylurea reduces photosynthesis and growth of petunia and impatiens. Journal of the American Society for Horticultural Science 122:536-541.
van Iersel, M.W. and B.Bugbee. 1996. Phytotoxic effects of benzimidazole fungicides on bedding plants. Journal of the American Society for Horticultural Science 121:1095-1102.