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Gas Exchange and Water Relations in Diploid and Tetraploid Russian Wildrye

USDA-ARS, Northern Great Plains Research Laboratory, P.O. Box 459, Mandan, ND 58554

View larger version (17K): [in a new window]   Fig. 1. Dry matter production for diploid and tetraploid entries of Russian wildrye grown at 50 and 150% of average rainfall. Data are means for 1994, 1995, and 1996. Significance at the 0.05 level of probability, as indicated with an *, was present between the tetraploid and diploid entry at the 50% water treatment, but not between entries at the 150% water treatment

View larger version (24K): [in a new window]   Fig. 2. Soil water potential (SWP) determined with thermocouple psychrometers at 45-cm depth for diploid and tetraploid entries of Russian wildrye at 50 and 150% of average rainfall and at 10 and 134 kg N ha-1. Data are means for 1994, 1995, and 1996. The Haun stage is presented above the x-axis. Final forage yields were determined at Haun Stage 9. Vertical bars are standard errors of the mean

View larger version (20K): [in a new window]   Fig. 3. Carbon exchange rate (CER) transpiration (T), and stomatal conductance (gs) for diploid and tetraploid entries of Russian wild-rye grown at 10 and 134 kg N ha-1 and 50% of average rainfall. Data are means for 1994, 1995, and 1996. Significance at 0.05 level of probability between entries at the same N rate is indicated with an * or ns (not significant) at each Haun stage for the 10 and 134 kg N ha-1 comparisons, respectively

View larger version (20K): [in a new window]   Fig. 4. Carbon exchange rate (CER), transpiration (T), and stomatal conductance (gs) for diploid and tetraploid entries of Russian wildrye grown at 10 and 134 kg N ha-1 and 150% of average rainfall. Data are means for 1994, 1995, and 1996. Significance at the 0.05 level of probability between entries at the same N rate is indicated with an * or ns (not significant) at each Haun stage for the 10 and 134 kg N ha-1 comparisons, respectively

View larger version (13K): [in a new window]   Fig. 5. Relationship between carbon isotope discrimination (CID) in leaves and field measured water use-efficiency (WUE) for diploid and tetraploid entries of Russian wildrye in 1994 and 1995. Regression equations are WUE = 65.01 - 3.06(CID), (r2 = 0.91) and WUE = 63.40 - 3.07(CID), (r2 = 0.65) for diploid and tetraploid entries, respectively