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Salinity Tolerance of Phaseolus Species during Germination and Early Seedling Growth

Dep. of Horticulture, The Pennsylvania State Univ., University Park, PA 16802

View larger version (21K): [in a new window]   Fig. 1. The effect of increasing NaCl concentration on median germination time (T50) of Phaseolus species (averaged over all accessions). Data shown as mean ± standard error of the mean of four replicates, each replicate is the average of seven seeds. ANOVA indicated that median germination response was influenced by species at 0 mM (F = 70, P 0.0001), 60 mM (F = 44.1, P 0.0001), 120 mM (F = 18, P 0.0001), and 180 mM (F = 3.5, P 0.0179) NaCl concentration. Exp. I.

View larger version (20K): [in a new window]   Fig. 2. The effect of increasing NaCl concentration on median response time (T50) of Phaseolus species. Data shown as mean ± standard error of the mean of eight replicates, each replicate is the average of 14 seeds. ANOVA indicated that median germination response was influenced by species at 0 mM (F = 17.2, P 0.0001), 60 mM (F = 20.5, P 0.0001), 120 mM (F = 9.2, P 0.0018), and 180 mM (F = 23, P 0.0003) NaCl concentration. Exp. II.

View larger version (51K): [in a new window]   Fig. 3. Effects of salinity on (a) hypocotyl and (b) radicle dry weight of Phaseolus species. Data shown as mean ± standard error of the mean of eight replicates. Experiment II.

View larger version (30K): [in a new window]   Fig. 4. Ward's Minimum Variance Dendrogram of 24 wild Phaseolus accessions and four cultivated accessions of common bean. A = P. angustissimus, F = P. filiformis, L = P. leptostachyus, M = P. microcarpus, and V = P. vulgaris. Exp. I. Optimum number of clusters was determined with the sum of square index, E.