Fig. 4

The gene ontology profile of the differentially abundant chloroplast proteins (DACPs) in wheat seedling leaves under drought stress and exogenous ALA pretreatment. The bar charts represent the functional annotations of the DACPs until the second level of complexity in ALA versus CK (a), drought versus CK (b), and D + A versus drought (c). CK, treated with 0 mg L^− 1 ALA + distilled water; ALA, treated with 100 mg L^− 1 ALA and distilled water; drought, treated with 0 mg L^− 1 ALA without distilled water; D + A, treated with 100 mg L^− 1 ALA without distilled water. The wheat plants underwent drought stress 3 d after pretreatment with or without ALA