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Updated: Apr 15, 2026

Author Spotlight: Exploring Cellular Zinc Regulation Through ZnT1 Functionality
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Unknown Functional Domain 506 Protein Regulates Zinc Tolerance in Apple.

Qing Wang1, Da-Ru Wang1, Ming-Hui Xu2

  • 1Apple Technology Innovation Center of Shandong Province, Shandong Collaborative Innovation Center of Fruit & Vegetable Quality and Efficient Production, National Key Laboratory of Wheat Improvement, College of Horticulture Science and Engineering, Shandong Agricultural University, Tai-An, Shandong, China.

Physiologia Plantarum
|April 14, 2026
PubMed
Summary

This study reveals that MdDUF506 enhances zinc tolerance in apple plants by reducing reactive oxygen species (ROS). Overexpression of MdDUF506 improves growth and stress adaptation in plants facing high soil zinc levels.

Keywords:
MdDUF506ROSZn stressapple

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Area of Science:

  • Plant Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Zinc (Zn) is vital for plants, but excess causes toxicity, hindering growth and yield.
  • Understanding plant adaptation to Zn stress is crucial for crops in Zn-rich soils.
  • The function of proteins with unknown domains, like the DUF506 family, is unclear.

Purpose of the Study:

  • To investigate the role of MdDUF506 in apple (Malus domestica) responses to zinc stress.
  • To elucidate the mechanism by which MdDUF506 influences plant adaptation to heavy metal toxicity.

Main Methods:

  • Gene expression analysis of heavy metal stress-related genes in MdDUF506-overexpressing apple plants.
  • Measurement of reactive oxygen species (ROS) levels, including hydrogen peroxide (H2O2) and superoxide anion (O2-), under Zn stress.
  • Assessment of plant growth and Zn tolerance in both whole plants and callus cultures.

Main Results:

  • MdDUF506 overexpression modulated the expression of genes associated with heavy metal stress.
  • Overexpressing plants exhibited significantly lower H2O2 (32%) and O2- (21%) content under Zn stress compared to wild-type.
  • Enhanced ROS scavenging via upregulated CAT, POD, and SOD enzymes contributed to improved growth and Zn tolerance.

Conclusions:

  • MdDUF506 positively regulates apple's response to Zn stress by modulating ROS-related gene expression.
  • Overexpression of MdDUF506 confers significant tolerance to zinc stress in apple plants and callus.
  • This research clarifies the function of the DUF506 family and offers a target for enhancing Zn stress resistance in fruit crops.