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The AT-hook motif nuclear-localized (AHL) family is a plant transcription factor family, which plays an important role in growth and development and stress responses. We identified and analyzed 37  AHL  genes in poplar ( Populus trichocarpa ). Phylogenetic analysis classified the  PtrAHL  members into three subfamilies based on their conserved domain. All  PtrAHL  paralogous pairs evolved under purifying selection. The promoter analysis revealed the presence of stress-related and phytohormone-related  cis -elements of the  PtrAHL  genes. Our analysis of the tissue-specific expression pattern of  PtrAHL  genes indicated their significance in tissue and organ development. Network-based prediction suggested that  PtrAHL  genes may interact with histone deacetylases (HDAC) and participate in the development of organs, such as roots. Drought negatively impacts plant growth and development. ABA is produced under osmotic stress condition, and it takes an important part in the stress response and tolerance of plants. Real-time quantitative PCR (qRT-PCR) showed that  PtrAHL  genes were induced by drought stress and ABA treatment. These insights into the expression of  PtrAHL  genes under stress provide a basis for  PtrAHL  gene functional analysis. Our study will help develop new breeding strategies to improve drought tolerance in poplar.

Comprehensive analysis of AHL gene family and their expression under drought stress and ABA treatment in Populus trichocarpa