ISSN:
1573-9058
Keywords:
endophyte
;
Lolium perenne
;
Neotyphodium lolii
;
photosynthesis
;
stomatal conductance
;
transpiration rate
;
water potential
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1007027131613
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