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Environmental Factors Determining Carbon Isotope Discrimination and Yield in Durum Wheat under Mediterranean Conditions

^a Unitat de Fisiologia Vegetal, Facultat de Biologia, Universitat de Barcelona, Diagonal 645, 08028 Barcelona, Spain
^b Area de Conreus Extensius, Centre UdL-IRTA, Alcalde Rovira Roure 191, 25198 Lleida, Spain
^c Departamento de Biología Vegetal, Facultad de Ciencias, Universidad de Granada, 18071 Granada, Spain

View larger version (13K): [in a new window]   Fig. 1. Relationship across the whole set of trials between the carbon isotope discrimination of mature grains and grain yield. Each point represents a rainfed or irrigated trial (composed by 25 genotypes and four replicates per genotype) grown in NE Spain or SE Spain.

View larger version (21K): [in a new window]   Fig. 2. Relationship across the whole set of trials between water input (including irrigation if applied) from sowing to maturity and either grain yield or carbon isotope discrimination. Each point represents either a rainfed or irrigated trial (composed by 25 genotypes and four replicates per genotype).

View larger version (22K): [in a new window]   Fig. 3. Relationship across the subset of trials, from NE Spain or SE Spain, between water input from sowing to heading and (a) grain yield or (b) carbon isotope discrimination of mature grains (), and between water input from heading to maturity and (c) grain yield or (d) carbon isotope discrimination. Each point represents either a rainfed or irrigated trial (composed by 25 genotypes and four replicates per genotype) grown in NE Spain or SE Spain.

View larger version (22K): [in a new window]   Fig. 4. Relationship between mean trial grain yield and the Pearson's correlation coefficient (r) of the relationship between grain yield and carbon isotope discrimination of mature kernels within the same trial (a). The correlation coefficients of the same relationships after subtracting the effect of DH are also shown (b). Each point represents a trial composed by 25 genotypes and four blocks per genotype. Trials were performed in NE Spain and SE Spain under two moisture regimes (irrigated and rainfed) and over 3 yr (1997–1999).

View larger version (19K): [in a new window]   Fig. 5. Relationship between mean trial grain yield and the slope of the regression of the relationship between grain yield and carbon isotope discrimination of mature kernels within the same trial (a). Slopes of the same relationship after subtracting the effect of DH are also shown (b). Each point represents a trial composed by 25 genotypes and four blocks per genotype. Trials were performed in NE Spain and SE Spain under two moisture regimes (irrigated and rainfed) and over 3 yr (1997–1999).