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Background Potassium (K) is important in the regulation of plant growth and development. It is the most abundant mineral element in kiwifruit, and its content increases during fruit ripening. However, how K +  transporter works in kiwifruit postharvest maturation is not yet clear. Results Here, 12 K +  transporter  KT/HAK/KUP  genes,  AcKUP1  ~  AcKUP12 , were isolated from kiwifruit, and their phylogeny, genomic structure, chromosomal location, protein properties, conserved motifs and  cis -acting elements were analysed. Transcription analysis revealed that  AcKUP2  expression increased rapidly and was maintained at a high level during postharvest maturation, consistent with the trend of K content;  AcKUP2  expression was induced by ethylene, suggesting that  AcKUP2  might play a role in ripening. Fluorescence microscopy showed that AcKUP2 is localised in the plasma membrane.  Cis -elements, including DER or ethylene response element (ERE) responsive to ethylene, were found in the  AcKUP2  promoter sequence, and ethylene significantly enhanced the  AcKUP2  promoter activity. Furthermore, we verified that AcERF15, an ethylene response factor, directly binds to the  AcKUP2  promoter to promote its expression. Thus,  AcKUP2  may be an important potassium transporter gene which involved in ethylene-regulated kiwifruit postharvest ripening. Conclusions Therefore, our study establishes the first genome-wide analysis of the kiwifruit  KT/HAK/KUP  gene family and provides valuable information for understanding the function of the  KT/HAK/KUP  genes in kiwifruit postharvest ripening.

Ethylene-induced potassium transporter AcKUP2 gene is involved in kiwifruit postharvest ripening