Photosynthetica 2001, 39(4):581-590 | DOI: 10.1023/A:1015664314720

Photosynthetic Response of Wheat to Stress Induced by Puccinia Recondita and Post-Infection Drought

O. Bethenod, L. Huber, H. Slimi

To quantify photosynthetic response of wheat to the combination of a fungal brown rust infection and a post-infection drought, four treatments were compared: no stress (control), fungal stress (FS), water stress (WS), and twofold stress (WS×FS). Predawn leaf water potential (Ψwp) was similar in FS and WS treatments over a 3-week period. In the WS treatment, net photosynthetic rate (PN) and stomata CO2 conductance (gs) diminished concomitantly with a constant intercellular CO2 concentration (Ci) close to 200 µmol mol-1. In the FS treatment, a reduction of PN occurred with an increase in respiration rate (doubling of the CO2 compensation concentration) and in Ci but with no water loss modification. Healthy leaves of infected plants (FS) showed a reduction of PN as well, with constant gs and increased Ci. In the twofold stress treatment (WS×FS), leaves showed reduced PN in relation to the lower Ψwp. Deleterious effects of both drought and fungal infection on the final area of leaves and dry matter were additive.

Additional key words: biotic stress; brown rust; intercellular CO2 concentration; leaf gas exchange; plant growth; respiration rate; stomata conductance; stress interaction; Triticum aestivum L.; water stress

Published: December 1, 2001  Show citation

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Bethenod, O., Huber, L., & Slimi, H. (2001). Photosynthetic Response of Wheat to Stress Induced by Puccinia Recondita and Post-Infection Drought. Photosynthetica, 39(4), 581-590. doi: 10.1023/A:1015664314720
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