Genome-Wide Identification, Phylogenetic Classification, and Expression Profiling of the HSF Gene Family in <i>Rosa hybrida</i> Under Heat and Drought Stress.

ABSTRACT: Rosa hybrida (R. hybrida), a widely cultivated ornamental species, is increasingly threatened by climate-induced abiotic stresses, including heat and drought. Heat shock transcription factors (HSFs) are critical for plant stress responses, yet their roles in R. hybrida remain understudied. In this research, 71 HSF genes were identified from the haplotype-resolved genome of the tetraploid variety 'Samantha'. These genes were classified into three major classes (HSFA, HSFB, HSFC) and 15 subgroups based on phylogenetic and motif analysis. Gene structure and conserved motifs revealed subgroup-specific functional divergence. Promoter analysis identified abundant hormone- and stress-responsive cis-elements, particularly for abscisic acid (ABA) and jasmonic acid. Synteny anal

SUBMITTER: Zhu J 

PROVIDER: S-EPMC12566850 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature