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The expression of genes encoding components of ABA and metabolic signalling pathways in developing barley endosperm and embryo was investigated.The genes included HvRCAR35_47387 and HvRCAR35_2538 (encoding ABA receptors),HvABI1d (protein phosphatase 2C),HvSnRK2.4,HvSnRK2.6 and HvPKABA1 (SnRK2-type protein kinases) and HvABI5 (ABA response element binding protein),as well as two genes encoding SnRK1-type protein kinases.