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Environmental Science and Pollution Research

, Volume 26, Issue 14, pp 13738–13745 | Cite as

Differences of Cd uptake and expression of MT family genes and NRAMP2 in two varieties of ryegrasses

  • Yanhua Li
  • Yuli Qin
  • Weihong XuEmail author
  • Yourong ChaiEmail author
  • Tao Li
  • Chunlai Zhang
  • Mei Yang
  • Zhangmi He
  • Deyu Feng
Sustainable Environmental Management

Abstract

In order to understand the mechanism of the difference of Cd absorption and Cd enrichment in different ryegrass varieties, pot experiment was conducted to study on the response of two varieties of ryegrass (Bond and Abbott) to Cd stress as well as the differences of Cd uptake and expression of MT family genes and NRAMP2. Results showed that root dry weights of two varieties and shoot dry weights of Abbott increased first and then decreased with the increase of Cd level in soil. When exposed to 75 mg kg−1 Cd, shoot dry weight and plant dry weight of Abbott both reached maximum values (10.92 and 12.03 g pot−1), which increased by 11.09 and 10.67% compared with the control, respectively. Shoot dry weight and plant dry weight of Bond decreased with the increase of Cd level in soil. When the Cd level in soil was 75 mg kg−1, shoot Cd concentrations of the two varieties were 111.19 mg kg−1 (Bond) and 133.69 mg kg−1 (Abbott), respectively, both of which exceeded the critical value of Cd hyperaccumulator (100 mg kg−1). The expression of MT gene family and NRAMP2 in the leaf of Bond variety significantly increased at the Cd level of 75 mg kg−1 and reached maximum value (except MT2C) at Cd level of 150 mg kg−1. The expression of MT gene family in the stem of Bond variety showed a double-peak pattern, while the expression of NRAMP2 was a single-peak pattern. The expression of MT gene family and NRAMP2 in Abbott variety was consistent with single-peak pattern. The expression of MT gene family and NRAMP2 in leaf both significantly increased at Cd level of 150 mg kg−1, while that in stem and root significantly increased at Cd level of 75 mg kg−1. For both varieties of ryegrass, the expression amount of MT family genes and Nramp2 in leaf was higher than that in root and stem, indicating the Cd tolerance of ryegrass can be improved by increasing the expression levels of MT family genes and Nramp2 in stem and root. There was significant genotypic difference in the expression of MT gene family and NRAMP2 between the two varieties of ryegrass, and the expression of MT gene family and NRAMP2 in leaves and stems of Bond variety was higher than that in Abbott variety, while the expression of MT gene family and NRAMP2 in roots of Abbott variety was higher than that in Bond variety. The two gene families investigated in this study may be closely related to Cd uptake, but not related to Cd transport from root to leaf and Cd enrichment in shoot.

Keywords

Soli Cd pollution Ryegrass varieties Cd uptake MT NRAMP2 

Notes

Funding information

This work was supported by Fund of China Agriculture Research System (CARS-23), and the National Science and Technology Pillar Program of China (No. 2007BAD87B10).

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Yanhua Li
    • 1
  • Yuli Qin
    • 1
  • Weihong Xu
    • 1
    Email author
  • Yourong Chai
    • 2
    Email author
  • Tao Li
    • 1
  • Chunlai Zhang
    • 1
  • Mei Yang
    • 1
  • Zhangmi He
    • 1
  • Deyu Feng
    • 1
  1. 1.College of Resources and Environmental SciencesSouthwest UniversityChongqingPeople’s Republic of China
  2. 2.College of Agronomy and BiotechnologySouthwest UniversityChongqingPeople’s Republic of China

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