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Obligatory Summer-Dormant Cool-Season Perennial Grasses for Semiarid Environments of the Southern Great Plains

^a TAMU Res. and Ext. Cent., P.O. Box 1658, Vernon, TX 76385, USA
^b Beijing Res. and Develop. Cent. for Grass and Environ., Beijing Acad. of Agric. and Forestry Sci., Banjing, Haidian District, Beijing 100098, P.R. China
^c TAMU Res. and Ext. Cent., 1229 North U.S. Hwy. 281, Stephenville, TX 76401, USA

View larger version (45K): [in a new window]   Fig. 1. (A) Average monthly temperature and (B) precipitation at the experimental location in Vernon, TX, during 2000–2004 (August).

View larger version (28K): [in a new window]   Fig. 2. Aboveground biomass production as a function of endophyte infection in (A) Georgia 5 and Jesup (averaged for both cultivars) in the first growing season and in (B) Grasslands Flecha tall fescue in 2001–2004 growing seasons. Bars indicate 1 S.E. E–, noninfected; WT, infected with wild-type (endemic) endophyte strains.

View larger version (32K): [in a new window]   Fig. 3. The number of surviving tillers of Grasslands Matua and Grasslands Tango prairiegrass, Grasslands Maru hardinggrass, and Grasslands Flecha tall fescue before (June) and after (December) summer drought during 2001–2004. Except for Grasslands Flecha, data were pooled for defoliation height. Bars indicate ± 1 S.E.

View larger version (20K): [in a new window]   Fig. 4. The number of living tillers of Grasslands Flecha tall fescue in response to infection with the novel endophyte strain AR542 before (June–July) and after (December) summer drought during 2001–2004. Data were pooled for defoliation height. Bars indicate ± 1 S.E. E–, noninfected.