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Water Relations, Forage Production, and Photosynthesis in Tall Fescue Divergently Selected for Carbon Isotope Discrimination

^a USDA-ARS, Box 646402, Washington State Univ., Pullman, WA 99164 USA
^b Institute of Soil and Water Conservation, Academia Sinica, Yangling, Shaanxi 712100, China

View larger version (17K): [in a new window]   Fig. 1 Carbon isotope discrimination () for the tall fescue cultivars Alta, Fawn, and Kentucky 31 (K-31), and for populations selected for high and low from K-31. Plants were grown at Central Ferry, WA, and data averaged across irrigated and dryland environments and sampling dates. The bar is the LSD at

View larger version (19K): [in a new window]   Fig. 2 Water relations for the tall fescue cultivars Alta, Fawn, and Kentucky 31 (K-31), and for populations selected for high and low from K-31. Plants were grown at Central Ferry, WA, and data averaged across irrigated and dryland environments and sampling dates. The bar is the LSD at

View larger version (18K): [in a new window]   Fig. 3 Forage production for the tall fescue cultivars Alta, Fawn, and Kentucky 31 (K-31), and for populations selected for high and low from K-31. Plants were grown at Central Ferry, WA, and data averaged across irrigated and dryland environments and sampling dates. The bar is the LSD at

View larger version (15K): [in a new window]   Fig. 4 Carbon isotope discrimination (), internal substomatal [CO2] (Ci), and water-use efficiency given as leaf photosynthetic assimilation (Aa, leaf area basis) divided by stomatal conductance (gs) of tall fescue Kentucky 31 (K-31) populations selected for high and low . Plants were grown under greenhouse conditions and data averaged across well-watered and polyethylene glycol stress treatments. The bar is the LSD at

View larger version (18K): [in a new window]   Fig. 5 Photosynthetic assimilation (Aa, leaf area basis) and stomatal conductance (gs) of tall fescue Kentucky 31 (K-31) populations selected for high and low . Plants were grown under greenhouse conditions and data averaged across well-watered and polyethylene glycol stress treatments. The bar is the LSD at

View larger version (18K): [in a new window]   Fig. 6 Photosynthetic assimilation (Ad, dry wt. basis) and specific leaf area (SLA) of tall fescue Kentucky 31 (K-31) populations selected for high and low . Plants were grown under greenhouse conditions and data are averaged across well-watered and polyethylene glycol stress treatments. The bar is the LSD at