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Carbon Isotope Discrimination as a Tool to Improve Water-Use Efficiency in Tomato

^a Dep. of Forestry, Oklahoma State Univ., Stillwater, OK 74078 USA

View larger version (29K): [in a new window]   Fig. 4 Association between dry weight and water use in the F2 generation of L. esculentum x L. pennellii grown in a wet and a dry environment in 1995 (A) and terminated early and late in 1996 (B). Regressions are across environments in each year. r, correlation coefficient; ***, P < 0.001

View larger version (34K): [in a new window]   Fig. 5 Association between water-use efficiency and carbon isotope discrimination in the F2 generation of L. esculentum x L. pennellii grown in a wet and a dry environment in 1995 (A) and terminated early and late in 1996 (B). Regressions are across environments in each year. r, correlation coefficient; ***, P < 0.001

View larger version (36K): [in a new window]   Fig. 6 Association between dry weight and water-use efficiency in the F2 generation of L. esculentum x L. pennellii grown in a wet and a dry environment in 1995 (A) and terminated early and late in 1996 (B). The regression is for the dry environment in 1995, whereas in 1996 the regressions are for the early and the late environments separately. r, correlation coefficient; *, P < 0.05; ***, P < 0.001

View larger version (39K): [in a new window]   Fig. 7 Association between dry weight and carbon isotope discrimination in the F2 generation of L. esculentum x L. pennellii grown in a wet and a dry environment in 1995 (A) and terminated early and late in 1996 (B). The regression is across the two environments in 1995, whereas in 1996 the regressions are for the early and the late environments separately. r, correlation coefficient; **, P < 0.01; ***, P < 0.001

View larger version (46K): [in a new window]   Fig. 1 Frequency distribution of dry weight in the F2 generation of L. esculentum x L. pennellii grown in a wet (A) and a dry (B) environment in 1995 and terminated early (C) and late (D) in 1996. Arrows indicate the mean dry weight of L. esculentum, L. pennellii, and the F1 generation

View larger version (45K): [in a new window]   Fig. 2 Frequency distribution of water-use efficiency in the F2 generation of L. esculentum x L. pennellii grown in a wet (A) and a dry (B) environment in 1995 and terminated early (C) and late (D) in 1996. Arrows indicate the mean water-use efficiency of L. esculentum, L. pennellii, and the F1 generation. In the dry environment, the value for L. pennellii was outside the range of the x-axis at 1.15 g kg-1

View larger version (41K): [in a new window]   Fig. 3 Frequency distribution of carbon isotope discrimination in the F2 generation of L. esculentum x L. pennellii grown in a wet (A) and a dry (B) environment in 1995 and terminated early (C) and late (D) in 1996. Arrows indicate the mean carbon isotope discrimination of L. esculentum, L. pennellii, and the F1 generation