| Summary: | Plants encounter a variety of abiotic stresses such as global climate change. Hsp70, as one of the main families of heat shock proteins (Hsps), has a great role in maintenance of the development and growth, and response to abiotic stress. Grape is a very popular fruit worldwide with a high economic value. However, the <i>Hsp70</i> gene family has not been thoroughly identified in grape (<i>Vitis vinifera</i> L.). In this study, a total of 33 <i>VvHsp70</i> genes were identified and divided into four clades in <i>V. vinifera</i>. Phylogenetic analysis, gene structure, conserved motif, and duplication events were performed for <i>VvHsp70</i> genes. The detailed information showed that the <i>VvHsp70</i> genes clustered together based on the phylogenetic tree had similar subcellular localization, gene structures, and conserved motifs, although there are exceptions. The expression patterns of <i>VvHsp70</i>, <i>VdHsp70</i>, or <i>VaHsp70</i> were explored in development and abiotic stress including heat, osmotic, and cold stresses by transcription data or qRT-PCR. The results showed that grape <i>Hsp70</i> genes had strong response for these abiotic stresses, particularly in heat and cold treatments in a different expression pattern. Most of the <i>VdHsp70</i> genes were upregulated in response to heat treatments while <i>VaHsp70</i> genes were downregulated in response to cold treatments. Together, our results revealed a new insight for the <i>Hsp70</i> gene family in grape and will afford fundamental knowledge for further functional analysis and breeding of stress-tolerant grapevines.
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