Increases in the Diffusion Resistances of Leaves in a Carbon Dioxide-Enriched Atmosphere |
| |
Authors: | JONES, RUTH J. MANSFIELD, T. A. |
| |
Abstract: | The stomatal closing reaction to CO2, which has been observedin laboratory studies by many workers, was investigated in plant-growthcabinets under conditions similar to those in glass-houses withCO2-enriched atmospheres. Lettuce and Xanthium plants grownin a normal atmosphere showed the expected stomatal closurein response to increasing CO2 concentrations, and lettuce plantsgrown in 1000 ppm CO2 showed the same response, even after 4weeks. Thus there was no evidence of acclimatization of thestomata and it is concluded that they must remain partiallyclosed during CO2-enrichment. Estimates of diffusion resistancesto CO2 intake in lettuce leaves showed that in light of 14.4J m2 S1, 880 ppm CO2 in the atmosphere resultedin a concentration of 367 ppm near the mesophyll cell walls.If the stomata remained open this same internal concentrationcould be achieved with an external concentration of only 640ppm. There could, therefore, be some economic advantage if stomatalclosure were prevented during CO2-enrichment. |
| |
Keywords: | |
本文献已被 Oxford 等数据库收录! |
|