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Gas Exchange of Four Cassava Cultivars in Relation to Light Intensity

Published online by Cambridge University Press:  03 October 2008

Jairo A. Palta
Jairo A. Palta
Affiliation:
Centro Internacional de Agricultura Tropical, CIAT, Cali, Colombia
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Summary

Gas exchange measurements were carried out on four cassava cultivars, M. COL22, M. MEX59, M. COL638, and M. VEN218, under a range of light intensities, to investigate possible differences in photosynthesis and transpiration. Over the range of photon flux density 100–1500 μE m−2 s−1 leaves showed a light saturation response typical of C-3 plants with little increase in photosynthetic rate above 1000–1500 μE m−2 s−1 (200–300 Wm−2 PAR). At light saturation there were significant differences in photosynthetic rates between cultivars, with the highest 10% greater than the lowest. Part of the response could be attributed to increased stomatal aperture, and a greater part to a direct effect of light intensity on the photosynthetic apparatus. Transpiration increased with light intensity levels, but no significant differences were observed between cultivars.

Type
Research Article
Information
Experimental Agriculture , Volume 18 , Issue 4 , October 1982 , pp. 375 - 382
Copyright
Copyright © Cambridge University Press 1982

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References

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