Plant Physiol.
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Plant Physiology 72:172-176 (1983)
© 1983 American Society of Plant Biologists

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Articles

Photosynthesis and Stomatal Conductance of Potato Clones (Solanum tuberosum L.) 1

Comparative Differences in Diurnal Patterns, Response to Light Levels, and Assimilation through Upper and Lower Leaf Surfaces

R. B. Dwelle, P. J. Hurley and J. J. Pavek

Department of Plant, Soil, and Entomological Sciences, University of Idaho, Research and Extension Center, Aberdeen, Idaho 83210, United States Department of Agriculture—Agricultural Research Service, University of Idaho, Research and Extension Center, Aberdeen, Idaho 83210

A few potato clones, such as A6948-4, had higher rates of photosynthesis in the field than the Russet Burbank and were able to maintain higher rates not only during mid-day but also in the early morning and late evening hours. In addition, they maintained higher carbon assimilation rates over a range of photosynthetic photon flux density from 400 to 2,000 microeinsteins per square meter per second.

Stomatal conductance increased linearly as irradiance increased from 500 to 2,000 microeinsteins per square meter per second with all four potato clones that were examined. Obviously, comparative measurements of stomatal conductance or diffusive resistance with potato must be taken at a known and constant photosynthetic photon flux density.

The upper (adaxial) leaf surface of some potato clones provided a surprising contribution to total carbon assimilation. Neither stomatal conductance, number of stomata per unit area, total area of the stomatal apparatus, nor chlorophyll content appear to account for differences in carbon assimilation rates among clones.

1 Supported in part by the Idaho Potato Commission and by United States Department of Agriculture Competitive Research Grant No. 59-2161-1-1-654-0. Cooperative investigations of the University of Idaho and the United States Department of Agriculture—Agricultural Research Service, Aberdeen, ID. Idaho Agricultural Experiment Station Research Paper No. 8274.






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Copyright © 1983 by the American Society of Plant Biologists