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Small heat shock proteins (sHSPs) are a group of chaperone proteins existed in all organisms. The functions of sHSPs in heat and abiotic stress responses in many glycophyte plants have been studied. However, their possible roles in halophyte plants are still largely known. In this work, a putative  sHSP  gene  KvHSP26  was cloned from  K. virginica . Bioinformatics analyses revealed that  KvHSP26  encoded a chloroplastic protein with the typical features of sHSPs. Amino acid sequence alignment and phylogenetic analysis demonstrated that KvHSP26 shared 30%-77% homology with other sHSPs from Arabidopsis, cotton, durian, salvia, and soybean. Quantitative real-time PCR (qPCR) assays exhibited that  KvHSP26  was constitutively expressed in different tissues such as leaves, stems, and roots, with a relatively higher expression in leaves. Furthermore, expression of  KvHSP26  was strongly induced by salt, heat, osmotic stress, and ABA in  K. virginica . All these results suggest that  KvHSP26  encodes a new sHSP, which is involved in multiple abiotic stress responses in  K. virginica , and it has a great potential to be used as a candidate gene for the breeding of plants with improved tolerances to various abiotic stresses.

The Chloroplastic Small Heat Shock Protein Gene KvHSP26 Is Induced by Various Abiotic Stresses in Kosteletzkya virginica