Analysis of codon usage patterns in Haloxylon ammodendron based on genomic and transcriptomic data

•Genome- and transcriptome-based codon usage patterns of H. ammodendron are similar.•The codon usage in H. ammodendron is biased toward A- and U-ending codons.•Natural selection is the determinant of the codon usage bias of H. ammodendron.•Gene expression level, function, and protein length also affect codon usage pattern.•Twenty-five common optimal codons were found in the genome and transcriptome.