Photosynthetica 1999, 36(11):107-112 | DOI: 10.1023/A:1007027131613

Gas Exchange and Chlorophyll Fluorescence in Symbiotic and Non-Symbiotic Ryegrass Under Water Stress

C. Amalric1, H. Sallanon2, F. Monnet2, A. Hitmi2, A. Coudret2
1 Département de Génie Biologique, Institut Universitaire de Technologie, Aurillac, France
2 Laboratoire de 'Biotechnologies Environnement Santé', Université d'Auvergne, Aurillac, France

The symbiotic association of endophyte fungus, Neotyphodium lolii, and ryegrass improves the ryegrass resistance to drought. This is shown by a 30 % increase in the number of suckers in infected plants (E+), compared to plants lacking endophyte (E-), and by a higher water potential in the E+ than E- plants. The E+ plants have higher stomatal conductance (g s), transpiration rate, net photosynthetic rate (P N), and photorespiratory electron transport rate than the E- plants. The maximal photochemical efficiency (Fv/Fm) and the actual photochemical efficiency (ΦPS2) are not affected by the endophyte fungus. The increase in P N of the E+ plants subjected to water stress was independent from internal CO2 concentration. An increased P N was observed in E+ plants also in optimal water supply. Hence the drought resistance of E+ plants results in increased g s, P N, and photorespiratory electron transport rate.

Additional key words: endophyte; Lolium perenne; Neotyphodium lolii; photosynthesis; stomatal conductance; transpiration rate; water potential

Published: July 1, 1999  Show citation

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Amalric, C., Sallanon, H., Monnet, F., Hitmi, A., & Coudret, A. (1999). Gas Exchange and Chlorophyll Fluorescence in Symbiotic and Non-Symbiotic Ryegrass Under Water Stress. Photosynthetica, 37(1), 107-112. doi: 10.1023/A:1007027131613
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