Gas Exchange and Chlorophyll Fluorescence in Symbiotic and Non-Symbiotic Ryegrass Under Water Stress |
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Authors: | Amalric C Sallanon H Monnet F Hitmi A Coudret A |
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Institution: | (1) Département de Génie Biologique, Institut Universitaire de Technologie, Rue de l'Ecole Normale, 15000 Aurillac, France;(2) Laboratoire de 'Biotechnologies Environnement Santé', Université d'Auvergne, Rue de l'Ecole Normale, 15000 Aurillac, France |
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Abstract: | 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.
This revised version was published online in June 2006 with corrections to the Cover Date. |
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Keywords: | endophyte Lolium perenne Neotyphodium lolii photosynthesis stomatal conductance transpiration rate water potential |
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