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In recent years, cadmium (Cd) pollution in soil has increased with increasing industrial activities, which has restricted crop growth and agricultural development. The heavy metal ATPase ( HMA ) gene family contributes to heavy metal stress resistance in plants. In this study, 21 HMA genes ( HvHMAs ) were identified in barley ( Hordeum  vulgare L., Hv ) using bioinformatics methods. Based on phylogenetic analysis and domain distribution, barley HMA genes were divided into five groups (A-E), and complete analyses were performed in terms of physicochemical properties, structural characteristics, conserved domains, and chromosome localization. The expression pattern analysis showed that most HvHMA genes were expressed in barley and exhibited tissue specificity. According to the fragments per kilobase of exon per million fragments values in shoots from seedlings at the 10 cm shoot stage (LEA) and phylogenetic analysis, five HvHMA genes were selected for expression analysis under Cd stress. Among the five HvHMA genes, three ( HvHMA1 , HvHMA3 , and HvHMA4 ) were upregulated and two ( HvHMA2 and HvHMA6 ) were downregulated following Cd treatments. This study serves as a foundation for clarifying the functions of HvHMA proteins in the heavy metal stress resistance of barley.

Genome-Wide Identification of the HMA Gene Family and Expression Analysis under Cd Stress in Barley