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Chinese Agricultural Science Bulletin ›› 2020, Vol. 36 ›› Issue (16): 55-60.doi: 10.11924/j.issn.1000-6850.casb20190500198

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Effects of Mixed Salt Stress on Biomass and Root Architecture of Iris lactea var. chinensis

Yuan Zebin1(), Mu Changhong1, Ouyang Xiuqin1, Wang Bo1, Sun Xiangli1,2,3,*()   

  1. 1.College of Architecture, Soochow University, Suzhou Jiangsu 215123
    2.Suzhou Key Laboratory for Architectural and Urban Environment, Suzhou Jiangsu 215123
    3.Soochow University, Suzhou Yuanke Group Collaborative Innovation Center for Architectural and Urban Environment, Suzhou Jiangsu 215123
  • Received:2019-05-27 Revised:2019-07-30 Online:2020-06-05 Published:2020-05-20
  • Contact: Sun Xiangli E-mail:sudayzb@163.com;sunxl@suda.edu.cn

Abstract:

The paper aims to study the effects of different salt stresses on the growth of the Iris lactea var. chinensis seedlings. The effects of NaCl and NaHCO3 single salt and different concentrations of salt solution on the root morphology, the ratio of dry weight to fresh weight in aboveground and underground, and the biomass were studied by means of indoor culture. The results showed that with the prolongation of stress time, the effect of 0.3% NaCl on leaf number and plant height growth was the smallest, followed by three mixed salt solutions, and the plant height increase reached the maximum on the 14 th day. The ratio of dry weight of shoots in the shoots treated with 0.3% NaHCO3 was 2.17 times of that of the blank control, and the dry weight of the shoots was 56.61% of the blank control. With the increase of NaHCO3 concentration in the mixed solution, the ratio of dry and fresh weight of the aboveground part showed an upward trend, and the ratio of dry to fresh weight in the ground showed a downward trend. After 35 days of treatment, the root length and root surface area of the horseshoe roots of 0.3% NaHCO3 stress decreased significantly compared with the control, by 39.73% and 26.08%, respectively, but there was no significant difference in root volume between the treatments. The results showed that 0.3% NaHCO3 solution had the strongest stress on the seedlings of Iris lactea var. chinensis, and the stress of the two single salts on the roots was stronger than that of the mixed salt, while the 0.3% NaCl solution had the weakest effect on the growth.

Key words: Iris lactea var. chinensis, salt stress, root morphology, dry and fresh weight, biomass

CLC Number: