Plant Molecular Biology Reporter

, Volume 30, Issue 5, pp 1149–1157

Cloning and Characterization of MxVHA-c, a Vacuolar H+-ATPase Subunit C Gene Related to Fe Efficiency from Malus xiaojinensis

  • Qian Zhang
  • Yi Wang
  • Xin Zhong Zhang
  • Li Li Yin
  • Ting Wu
  • Xue Feng Xu
  • Wen Suo Jia
  • Zhen Hai Han
Original Paper

DOI: 10.1007/s11105-012-0426-6

Cite this article as:
Zhang, Q., Wang, Y., Zhang, X.Z. et al. Plant Mol Biol Rep (2012) 30: 1149. doi:10.1007/s11105-012-0426-6

Abstract

The vacuolar H+-ATPase plays a crucial role in secondary transport and in plant response to environmental stress. In this study, a vacuolar H+-ATPase (MxVHA-c) gene, consisting of an ORF of 498 base pairs and 165 amino acid residues, has been cloned from the iron-efficient genotype of Malus xiaojinensis. Subsequently, this gene has been targeted to the tonoplast using transient expression analysis. Quantitative real-time (qRT) PCR results reveal that the MxVHA-c gene is expressed in both roots and leaves of Fe-deficient plants; however, it is sensitive to iron stress in roots. This suggests that MxVHA-c expression in roots may mediate iron-dependent responses. MxVHA-c expression is up-regulated following exogenous treatment with abscisic acid (ABA) and down-regulated following treatment with CaCl2. Overexpression of the MxVHA-c gene in yeast strains has revealed that MxVHA-c transiently alleviated cadmium toxicity via the Cd2+/H+ antiport protein. H+-ATPase activity is slightly increased in yeast overexpressing the MxVHA-c gene compared to that in yeast transformed with an empty vector. In addition, this transgenic yeast strain can grow in a liquid medium containing 40 μM ferrozine. These findings may provide useful information in elucidating molecular mechanisms that mediate resistance to iron deficiency.

Keywords

H+-ATPase activityIron deficiencyMalus xiaojinensisVacuolar H+-ATPase

Abbreviations

qRT-PCR

Quantitative real-time polymerase chain reaction

VHA

Vacuolar H+-ATPase

YPD

Yeast growth medium

SD

Selection medium

RFU

Relative fluorescence unit

eGFP

Enhanced green fluorescent protein

Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • Qian Zhang
    • 1
  • Yi Wang
    • 1
  • Xin Zhong Zhang
    • 1
  • Li Li Yin
    • 1
  • Ting Wu
    • 1
  • Xue Feng Xu
    • 1
  • Wen Suo Jia
    • 1
  • Zhen Hai Han
    • 1
  1. 1.Institute for Horticultural PlantsChina Agricultural UniversityBeijingPeople’s Republic of China