Biotechnology Bulletin ›› 2022, Vol. 38 ›› Issue (4): 143-152.doi: 10.13560/j.cnki.biotech.bull.1985.2021-1127

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Alleviation Mechanisms of Zinc-selenium Interaction on the Cadmium Toxicity in Rice Under Cadmium Stress

HU Yan-jiao1,2(), CHEN Mei-feng1, QIANG Yu1, LI Hai-yan1, LIU Jing1,2, QIN Fan-xin1,2()   

  1. 1. School of Life Sciences,Guizhou Normal University,Guiyang 550025
    2. Guizhou Key Laboratory of Plant Physiology and Developmental Regulation,Guizhou Normal University,Guiyang 550025
  • Received:2021-09-02 Online:2022-04-26 Published:2022-05-06
  • Contact: QIN Fan-xin E-mail:362481828@qq.com;qinfanxin@126.com

Abstract:

This work aims to study cadmium Cd,zinc(Zn),selenium(Se)and various combinations of them on the germination of rice seeds,growth and development of plants,and the Cd contents in different parts,as well as to explore the alleviation mechanisms of Zn or Se or Zn-Se interaction on the toxicity of Cd in rice. Having rice variety Nanjing 9108 as study object,germination and hydroponic experiment were conducted to measure the germination,growth,physiological indexes and Cd content in different parts. The experimental results showed that seed germination was promoted at low concentration of Cd,while inhibited at high concentration. The inhibitory effects of Cd on the physiological indexes of rice seeds were alleviated after Zn added,and accumulation of Cd was reduced. Instead,the inhibitory effects of Cd on the physiological indexes of rice seeds were not alleviated after Se added,and high concentration of Se increased the toxicity of Cd on the seeds and led to the physiological indexes of seeds reduced. The synergistic application of Zn and Se promoted seed germination,but did not facilitate the growth of rice seedlings. Under 5 mg/L Cd stress,adding Zn or Se at different concentrations both significantly increased the lengths of roots,the heights of seedlings,relative water contents of leaves and the value of SPAD,alleviated the toxicity of Cd to rice growth and development,as well as significantly reduced Cd contents in the roots of rice. The heights of seedlings and SPAD decreased dramatically,and lengths of roots and relative water contents did not change observably after Zn and Se were added together. Therefore,appropriate concentration of Zn and Se may effectively decrease the Cd accumulation in rice,and reduce the toxicity of Cd to rice.

Key words: zinc, selenium, cadmium stress, rice