Figure 8.

Effect of drought stress and PGPR application on total soluble sugars (Fig. 4a,b), free amino acids (Fig. 4c,d), soluble proteins (Fig. 4e,f), and proline contents (Fig. 4g,h) in two potato cultivars. Plants of both genotypes were treated with 100 g of bio-fertilizer at 10 days after germination and exposed to different soil relative water contents (SRWC), including 80 ± 5% (well watered; CK), 60 ± 5% (moderate stress; MS) and 40 ± 5% SRWC (severe stress; SS) for 7 days at tuber initiation stage (30 days after germination). The data is mean of 5 replications. Lowercase letters above bars indicate significant difference between the treatments at P < 0.05.