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Published in Crop Sci 11:550-553 (1971)
© 1971 Crop Science Society of America
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Physiological Basis for Genotypic Variation in Net Photosynthesis of Oat Leaves1

J. G. Criswell and R. M. Shibles2

The net CO2 exchange rate of flag-leaf blades of 20 oat (Avena spp.) genotypes was measured by infrared gas analysis in 1968 and 1969. Net photosynthetic rate and rate of CO2 efflux into CO2-free air in light differed significantly among genotypes. Rankings were consistent across years. The CO2 compensation point was the least variable of the factors measured, and it was not related to net photosynthetic rate. A positive correlation between net photosynthesis and CO2 efflux was found; genotypes showing high CO2 efflux rates were concluded to have a lower resistance to CO2 diffusion between leaf respiratory sites and the external atmosphere. Differences in diffusion resistances, particularly the residual or mesophyll resistance, seemed to explain best the differences in net photosynthesis.

Mean genotypic net photosynthetic rates were correlated with mean specific leaf dry weights (g dry weight dm-2 leaf area). That mean residual resistance values were negatively correlated with mean specific leaf dry weight values indicates that internal leaf morphology or biochemical factors associated with morphological characteristics of the oat leaf may be associated with genotypic differences in net photosynthesis.

Key Words: Avena spp • Specific leaf weight • Diffusion resistances

1 Journal Paper No. J-6790 of the Iowa Agriculture and Home Economics Experiment Station, Ames, Iowa 50010. Project No. 1487. This research was supported, in part, by a grant from the Quaker Oats Company.

2 NDEA Graduate Fellow and Professor, Department of Agronomy, Iowa State University of Science and Technology, Ames, Iowa 50010, (Present address of senior author: Department of Crop Science, University of Guelph, Guelph, Ontario, Canada).

Received for publication January 2, 1971.




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