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Plant Growth Regulation

, Volume 81, Issue 3, pp 523–532 | Cite as

The difference of cadmium accumulation between the indica and japonica subspecies and the mechanism of it

  • Quan Zhou
  • Guo-Sheng Shao
  • Ying-Xing Zhang
  • Qing Dong
  • Hong Wang
  • Shi-Hua Cheng
  • Li-Yong Cao
  • Xi-Hong Shen
Original paper

Abstract

Many studies have shown genotypic differences in Cadmium (Cd) accumulation among rice cultivars, and concentrations in shoots and grains are generally higher in indica rice cultivars than in japonica rice cultivars, but the mechanism remains unknown. The main objective of this study was to investigate differences in heavy metal accumulation between rice subspecies through the analysis of 46 indica cultivars and 30 japonica cultivars. At the seedling stage, the mean Cd concentrations in the shoots of indica subspecies were significantly higher than those in japonica subspecies (1.22-fold), but this pattern was not observed in the roots. At the filling stage, the mean Cd concentrations in the shoots and spikes of indica subspecies were 1.66- and 2.14-fold higher than the respective concentrations in japonica subspecies. At the harvest stage, the mean Cd concentrations in the shoots and brown rice of indica subspecies were 1.61- and 2.27-fold higher than the respective concentrations in japonica subspecies. These results indicate that root-to-shoot and shoot-to-grain translocation, rather than Cd absorption in the roots, may be the key processes that determine the differences in Cd accumulation among rice subspecies. Gene expression analysis revealed that overall, the expression levels of the Cd transporter gene OsNramp1 notably increased (22.46-fold), but the expression levels of OsHMA2, OsHMA3 and OsNRAMP5 were not significantly changed at the seedling stage in the 76 cultivars exposed to Cd; the expression levels of OsNramp1 were positively correlated with the Cd concentrations in spikes at the filling stage. In addition, a significant difference was observed in the expression levels of OsNramp1 between the indica and japonica subspecies, which may explain the higher Cd concentrations in roots but lower Cd concentrations in spikes and brown rice for the japonica subspecies. Together, these results demonstrate that OsNramp1 may be the most important gene among the four selected genes in the promotion of Cd uptake by roots and transfer of Cd into spikes and eventually into brown rice.

Keywords

Cadmium accumulation Rice subspecies Translocation Cd transporter Gene expression 

Abbreviations

Cd

Cadmium

CK

Control

TFrs

Translocation factor of root to shoot

Notes

Acknowledgments

This work was supported by a Special Fund for Agro-Scientific Research in the Public Interest (No. 201403015), the National Natural Science Foundation of China (No. 31571616) and Funds for Science and Technology Innovation Project from the Chinese Academy of Agricultural Sciences. We gratefully acknowledge Dr. Da-Li Zeng, China National Rice Research Institute, China, for supplying seeds of the 76 selected cultivars.

Supplementary material

10725_2016_229_MOESM1_ESM.docx (779 kb)
Supplementary material 1 (DOCX 778 KB)

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Copyright information

© Springer Science+Business Media Dordrecht 2016

Authors and Affiliations

  • Quan Zhou
    • 1
  • Guo-Sheng Shao
    • 1
  • Ying-Xing Zhang
    • 1
  • Qing Dong
    • 1
  • Hong Wang
    • 1
  • Shi-Hua Cheng
    • 1
  • Li-Yong Cao
    • 1
  • Xi-Hong Shen
    • 1
  1. 1.China National Rice Research InstituteHangzhouChina

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