Photosynthetica 1997, 33(13):409-418 | DOI: 10.1023/A:1006868219162

Leaf gas exchange of cassava as affected by quality of planting material and water stress

M.G. Cayón1, M.A. El-Sharkawy1, L.F. Cadavid1
1 Physiology Section, Cassava Program, Centro Internacional de Agricultura Tropical (CIAT), Apartado Aéreo, Cali, Colombia

Field trial was conducted to study the effects of quality of planting material and prolonged water stress on leaf gas exchange of the cassava (Manihot esculenta Crantz) cultivar M Col 1684. Nutrient contents of planting material affected rootlet formation, but not leaf gas exchange. Net photosynthetic rate (PN), stomatal conductance (gs), and intercellular CO2 concentration (Ci) were significantly reduced by prolonged water stress. New leaves developed after recovery from water stress showed higher PN and gs, as compared to leaves of similar ages of unstressed plants. The higher PN was associated with higher leaf nutrient contents, indicating that photosynthetic capacity was enhanced in these leaves. These compensating characteristics may partly explain the small yield reduction often observed in stressed cassava.

Additional key words: intercellular CO2 concentration; Manihot esculenta; net photosynthetic rate; nutrient level; stake quality; stomatal conductance; water potential

Prepublished online: January 1, 1998; Published: September 1, 1997  Show citation

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Cayón, M.G., El-Sharkawy, M.A., & Cadavid, L.F. (1997). Leaf gas exchange of cassava as affected by quality of planting material and water stress. Photosynthetica, 34(3), 409-418. doi: 10.1023/A:1006868219162
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