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Published in Crop Sci 9:451-454 (1969)
© 1969 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Carbon Dioxide Uptake in Nitrogen-Deficient Plants1

G. J. A. Ryle and J. D. Hesketh2

Carbon dioxide uptake at the leaf surface in air and in oxygen-free air was examined in maize (Zea mays L.), cotton (Gossypium hirsutum L.), and bean (Phaseolus vulgaris L.) plants exposed to an increasing deficiency of nitrogen. Carbon assimilation in these conditions was then related to the stomatal and apparent mesophyll resistances to CO2 transfer.

Lack of nitrogen decreased carbon assimilation in all three species. Assimilation was enhanced in oxygen-free air in cotton and beans, but little affected in maize. The inhibition of assimilation in nitrogen-deficient plants was accompanied by an apparent increase in mesophyll resistance to CO2 transfer, but some increase in stomatal resistance was also measured. Enhancement of carbon assimilation in oxygen-free air was negatively associated with the apparent mesophyll resistance to CO2 transfer. Such apparent resistances in the mesophyll may be associated with differences in dark reactions, with a light or photosynthetically-induced respiratory pathway, as well as with CO2 diffusion.

Key Words: Stomatal resistance • Mesophyll resistance

1 Research conducted at the Division of Plant Industry, CSIRO, Canberra, Australia. The first author was partially supported by a Stapledon Memorial Trust Fellowship.

2 Grassland Research Institute, Hurley, Berks, U.K.; and Division of Plant Industry, CSIRO, Canberra, A.C.T., Australia; (Presently, Research Soil Scientist, Soil and Water Conservation Research Division, Agricultural Research Service, USDA, State College, Miss. 39762).

Received for publication November 27, 1968.




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