Plant Molecular Biology Reporter

, Volume 37, Issue 1–2, pp 98–110 | Cite as

Phylogenetic and Expression Analysis of Mn-CDF Transporters in Pear (Pyrus bretschneideri Rehd.)

  • Lei Hou
  • Dongfang Gu
  • Yun Li
  • Jiyu Li
  • Jingjun Li
  • Xi ChenEmail author
  • Wei ZhangEmail author
Original Paper


Metal tolerance proteins (MTPs) play important roles in heavy metal homeostasis and tolerance in plants. As a part of the MTP family, manganese-cation diffusion facilitator (Mn-CDF) subfamily members transport Mn and iron (Fe) in plants. However, the role of these Mn-CDFs in pear is not well established. In this study, seven members of the Mn-CDF subgroup were identified in Chinese white pear (Pyrus bretschneideri Rehd.), based on recently released draft genome of pear. These members were predicted to encode proteins ranging from 394 to 416 amino acids, including 6 putative transmembrane domains (TMDs), and predicted to localize in the Golgi or vacuole membrane. Furthermore, all the members contained a highly conserved signature sequence in TMD-II and TMD-V. Yeast functional complementation assays demonstrated that the expression of PbMTP8.1, PbMTP8.2, PbMTP9, and PbMTP10 in particular conferred Mn and Fe tolerance, while PbMTP11.1 and PbMTP11.2 only transport Mn, and PbMTP11.3 transports neither Mn nor any other ion that was used in the study. Quantitative real-time PCR analysis indicated that these genes were widely expressed in the root, stem, and leaf tissues of the pear seedlings, but the expression levels differed among the different tissues. The results provide us with systematic information about the Mn-CDF subgroup genes and their possible roles in the distribution and homeostasis of Mn and Fe in pear.


Pear Manganese Iron Cation diffusion facilitator Metal tolerance protein 



cation exchanger


cation diffusion facilitator


iron-regulated transporter


metal tolerance protein


natural resistance–associated macrophage protein


synthetic drop-out uracil


transmembrane domain


vacuolar iron transporter




yeast extract peptone dextrose


yellow stripe-like


Funding Information

This work was supported by the National Natural Science Foundation of China (grant numbers 31301839, 51572131) and a project funded by the Fundamental Research Funds for the Central Universities (grant number KJZ201743).


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© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Biochemistry & Molecular Biology, College of Life SciencesNanjing Agricultural UniversityNanjingChina

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