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Response of Cassava to Water Deficit

Leaf Area Growth and Abscisic Acid

^a EMBRAPA, Cassava and Fruit Crops Unit, Caixa Postal 007, 44.380-000 Cruz das Almas, Bahia, Brazil
^b Dep. of Soil, Crop and Atmospheric Sciences, Cornell University, 519 Bradfield Hall, Ithaca, NY 14853 USA

View larger version (15K): [in a new window]   Fig. 1 Transpiration rate in cassava plants during 6 d of water deficit. Each point is the average of five genotypes (one plant per genotype) and bars represent standard error of the mean

View larger version (21K): [in a new window]   Fig. 2 (A) Individual leaf area growth and (B) leaf area growth rate in the first folded leaf (F1 leaf) estimated at 3-d intervals in cassava plants under water stress (6 d of water deficit followed by 9 d of rewatering) and control. Average of four genotypes with three replicates. Bars represent standard error of the mean (n = 12). Rate of leaf area growth was calculated based on the increment of leaf area at each 3-d interval; the values are plotted at the last day the data were collected

View larger version (19K): [in a new window]   Fig. 3 Abscisic acid (ABA) concentration in (A) expanding and (B) mature cassava leaves in controls and after 3 and 6 d of water deficit (Days 3 and 6) followed by periods of 1, 3, and 6 d of rewatering (Days 7, 9, and 12). Average of five genotypes with three replicates. Bars represent standard error of the mean (n = 15)

View larger version (22K): [in a new window]   Fig. 4 Abscisic acid (ABA) concentration in expanding (UF1 and UF2) and mature cassava leaves in control and water deficit treatments (3 and 6 d of stress [DAS]). Average of five genotypes with three replicates. Bars represent standard error of the mean (n = 15)