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ORIGINAL ARTICLE

Genome‑wide characterization and expression analysis of HAK ­K+ transport family in Ipomoea Rong Jin1 · Wei Jiang1 · Mengxiao Yan2 · Aijun Zhang1 · Ming Liu1 · Peng Zhao1 · Xiaoguang Chen1 · Zhonghou Tang1  Received: 26 August 2020 / Accepted: 12 November 2020 © King Abdulaziz City for Science and Technology 2020

Abstract The potassium transporter high-affinity ­K+ transporter/K+ uptake permease/K+ transporter (HAK/KUP/KT) family plays a vital role in potassium uptake, and potassium ion (­ K+)-mediated environmental stress. In the present study, we identified 22 IbHAK/KUP/KT (HAK) genes in sweet potato [Ipomoea batata (L.) Lam] and the same number of HAK genes from sweet potato wild relative Ipomoea trifida. Phylogeny analysis indicated that the HAKs can be divided into five clades. Chromosomal distribution and genome synteny analyses revealed two tandem-duplicated gene pairs IbHAK16/17 and IbHAK17/18 on chromosomes 13 and eight segmental-duplicated gene pairs on chromosomes 1, 3, 5, 8, 10, 12, 14 among the IbHAK gene family. Eleven orthologous HAK gene pairs between I. batata and I. trifida were involved in the duplication of genomic blocks based on comparative genomic analysis. The Ka/Ks ratios of these IbHAK genes ranged from 0.02 to 0.55(

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