This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in Web of Science Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via CrossRef Citing Articles via Web of Science (51) Citing Articles via Google Scholar Google Scholar Articles by Drake, B. Articles by Raschke, K. Search for Related Content PubMed PubMed Citation Articles by Drake, B. Articles by Raschke, K. Agricola Articles by Drake, B. Articles by Raschke, K.

Articles

Prechilling of Xanthium strumarium L. Reduces Net Photosynthesis and, Independently, Stomatal Conductance, While Sensitizing the Stomata to CO₂¹

^a Michigan State University / Atomic Energy Commission Plant Research Laboratory, Michigan State University, East Lansing, Michigan 48824

Greenhouse-grown plants of Xanthium strumarium L. were exposed in a growth cabinet to 10 C during days and 5 C during nights for periods of up to 120 hours. Subsequently, CO₂ exchange, transpiration, and leaf temperature were measured on attached leaves and in leaf sections at 25 or 30 C, 19 C dew point of the air, 61 milliwatts per square centimeter irradiance, and CO₂ concentrations between 0 and 1000 microliters per liter ambient air. Net photosynthesis and stomatal conductance decreased and dark respiration increased with increasing duration of prechilling. The reduction in net photosynthesis was not a consequence of decreased stomatal conductance because the intercellular CO₂ concentration in prechilled leaves was equal to or greater than that in greenhouse-grown controls. The intercellular CO₂ concentration at which one-half maximum net photosynthesis occurred remained the same in prechilled leaves and controls (175 to 190 microliters per liter). Stomata of the control plants responded to changes in the CO₂ concentration of the air only slightly. Prechilling for 24 hours or more sensitized stomata to CO₂; they responded to changes in CO₂ concentration in the range from 100 to 1000 microliters per liter.

¹ This research was supported by the United States Atomic Energy Commission under Contract AT(11-1)-1338.

This article has been cited by other articles:

				D. J. Allen, K. Ratner, Y. E. Giller, E. E. Gussakovsky, Y. Shahak, and D. R. Ort An overnight chill induces a delayed inhibition of photosynthesis at midday in mango (Mangifera indica L.) J. Exp. Bot., November 1, 2000; 51(352): 1893 - 1902. [Abstract] [Full Text] [PDF]