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Assessment of Drought Resistance of Crop Genotypes by Means of the Water Potential Index

^a Lab. of Crop Production, Agricultural Univ. of Athens 75, Iera Odos, 11855 Athens, Greece

View larger version (23K): [in a new window]   Fig. 1 The time course of leaf water potential () for the wheat cultivar Yecora grown under rainfed conditions during the 1984-1985 season. The shaded area represents the water potential duration (WPD), and the vertical bars the standard errors of the means

View larger version (16K): [in a new window]   Fig. 2 The fitted linear regressions between grain yields and water potential index (WPI) for the bread wheat cultivars Yecora, Siette Cerros, and Generoso. The points represent results from each plot. Data for both seasons (1984-1985 and 1985-1986) are included

View larger version (21K): [in a new window]   Fig. 3 The fitted linear regressions between seed yields and water potential index (WPI) for the faba bean cultivars VT-1, FLIP-86, Brocal, KY-188, and R29-T. The points represent results from each plot. Data for the three seasons (1988-1989, 1989-1990, and 1990-1991) are included

View larger version (14K): [in a new window]   Fig. 4 The fitted linear regressions between yields and WPI for the wheat cultivar Yecora (squares) and the faba bean cultivar KY-188 (circles). The data for the different seasons are shown [first season, open symbols; second season, filled symbols; third season (in faba beans only), half-filled symbols]. No marked deviations from the fitted lines among seasons are observed

View larger version (11K): [in a new window]   Fig. 5 Representation of the regression lines between yields and WPI for four hypothetical cultivars exhibiting different behavior under drought. 1: high potential yield, high adaptability. 2: high potential yield, low adaptability. 3: low potential yield, high adaptability. 4: low potential yield, low adaptability