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The heat shock protein 90 ( Hsp90 ) is a protein produced in plants in response to stress. This study identified and analyzed  Hsp90  gene family members in the perennial ryegrass genome. From the results, eight  Hsp90  proteins were obtained and their MW, pI and number of amino acid bases varied. The amino acid bases ranged from 526 to 862. The CDS also ranged from 20 ( LpHsp0-4 ) to 1  (LpHsp90-5 ). The least number of CDS regions was 1 ( LpHsp90-5 ) with 528 kb amino acids, while the highest was 20 ( LpHsp90-4 ) with 862 kb amino acids, which showed diversity among the protein sequences. The phylogenetic tree revealed that  Hsp90  genes in  Lolium perenne ,  Arabidopsis thaliana ,  Oryza sativa  and  Brachypodium distachyon  could be divided into two groups with five paralogous gene pairs and three orthologous gene pairs. The expression analysis after perennial ryegrass was subjected to heat, salt, chromium (Cr), cadmium (Cd), polyethylene glycol (PEG) and abscisic acid (ABA) revealed that  LpHsp90  genes were generally highly expressed under heat stress, but only two  LpHsp90  proteins were expressed under Cr stresses. Additionally, the expression of the  LpHsp90  proteins differed at each time point in all treatments. This study provides the basis for an understanding of the functions of  LpHsp90  proteins in abiotic stress studies and in plant breeding.

Genome-Wide Identification of Hsp90 Gene Family in Perennial Ryegrass and Expression Analysis under Various Abiotic Stresses