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Role of Chitosan in the Regulation of the Growth, Antioxidant System and Photosynthetic Characteristics of Maize Seedlings under Cadmium Stress

  • D. Y. Qu
  • W. R. Gu
  • L. G. Zhang
  • C. F. Li
  • X. C. Chen
  • J. Li
  • L. J. Li
  • T. L. Xie
  • S. Wei
RESEARCH PAPERS
  • 15 Downloads

Abstract

Cadmium (Cd) pollution was becoming more and more serious; there is an urgent need for an effective solution to inhibit the harm of cadmium stress. Chitosan (CTS) is a biologically active polysaccharide that plays a unique role under abiotic stress. So it was of much improtance to explore the effects of CTS on maize resistance ability. The results showed that maize (Zea mays L.) seedling growth was significantly inhibited, root system was the first organ that contact with cadmium stress, so the roots accumulated a lot of cadmium content, reducing the root activity, root growth was blocked, which led a reduction in nutrients to the leaves, and the chlorophyll content and photosynthetic enzyme activity were decreased. Additionally, the antioxidant enzyme activity was reduced. Under cadmium stress, CTS treatments significantly increased the growth rate and compensated for the function of root system, and which increased SOD, POD, CAT, APX and GR activities and AsA, GSH contents of leaves, but reduced \({\text{O}}_{2}^{{\centerdot \, - }}\), H2O2 and MDA contents. CTS increased chlorophyll content, Pn, Gs, Tr, Fv/Fm, ΦPSII, qP and NPQ, reduced Ci, avoided excessive light damage and maintained higher PSII activity. CTS alleviated the destruction of antioxidant enzymes and inhibited the production of reactive oxygen species, which improved the chlorophyll content and photosynthesis of plants. Our results showed that CTS could be used in cadmium-contaminated areas to reduce the toxicity of cadmium stress. The study results provide a theoretical and experimental basis for the safe production of maize in cadmium-contaminated areas.

Keywords:

Zea mays maize chitosan cadmium stress antioxidant enzymes photosynthetic characteristics 

Notes

ACKNOWLEDGMENTS COMPLIANCE WITH ETHICAL STANDARDS

The authors would like to thank the financial support from the National Key Research and Development Program of China (project no. 2017YFD0300506), National Key Research and Development Program of China (project no. 2016YFD0300103), Heilongjiang Youth Science Foundation (project no. QC2015032) and “Academic Backbone” Project of Northeast Agricultural University (project no. 17XG23).

The authors declare that they have no conflict of interest. This article does not contain any studies involving animals or human participants performed by any of the authors.

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Copyright information

© Pleiades Publishing, Ltd. 2018

Authors and Affiliations

  • D. Y. Qu
    • 1
  • W. R. Gu
    • 1
  • L. G. Zhang
    • 2
  • C. F. Li
    • 1
  • X. C. Chen
    • 2
  • J. Li
    • 1
    • 2
  • L. J. Li
    • 1
  • T. L. Xie
    • 1
  • S. Wei
    • 1
  1. 1.College of Agriculture, Northeast Agricultural UniversityHarbinChina
  2. 2.Maize research Institute, Heilongjiang Academy of Agricultural SciencesHarbinChina

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