Fig. 7.

Gas exchange parameters and water status in two Medicago truncatula genotypes grown under well-watered and drought conditions with and without pea aphid infestation. (A) Stomatal conductance; (B) transpiration rate; (C) water-use efficiency (D) water potential; and (E) relative water content. Each value represents the mean (±SE) of eight replicates. Different lower case letters indicate significant differences among the combinations of aphid treatment and water treatment within the same genotype. Different upper case letters indicate significant differences between genotypes within the same water treatment and aphid treatment as determined by Tukey’s multiple range test at P<0.05.