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Acta Prataculturae Sinica ›› 2024, Vol. 33 ›› Issue (5): 196-203.DOI: 10.11686/cyxb2023218

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Evaluation and identification of salt tolerance of 11 Leonurus germplasm lines at the seedling stage

Chen MENG1,2,3(), Xue-li LU1,2,3, Yi-ru SONG4, Cheng-sheng ZHANG1,2,3, Yi-qiang LI1,2,3, Hai-qin XIANG5, Zong-chang XU1,2,3()   

  1. 1.Marine Agriculture Research Center,Tobacco Research Institute of Chinese Academy of Agricultural Sciences,Qingdao 266100,China
    2.National Center of Technology Innovation for Comprehensive Utilization of Saline-alkali Land,Dongying 257345,China
    3.Qingdao Key Laboratory of Coastal Saline-alkali Land Resources Mining and Biological Breeding,Qingdao 266100,China
    4.College of Agriculture,Qingdao Agricultural University,Qingdao 266109,China
    5.Dongying Xinshengdai Biotechnology Co. ,Ltd. ,Dongying 257300,China
  • Received:2023-06-27 Revised:2023-07-28 Online:2024-05-20 Published:2024-02-03
  • Contact: Zong-chang XU

Abstract:

Soil salinization is one of the main factors restricting agricultural development in China. The use of medicinal plants for biological improvement of saline alkali land is an effective means of resource utilization of it. In this study, 11 Leonurus heterophyllus materials were treated with 2% w/v NaCl at the seedling stage to impose salt stress, and 12 indexes including plant height, root length, leaf area, above-ground fresh weight, and root fresh weight were measured. Multivariate statistical analysis methods such as principal component analysis and membership function analysis were used to evaluate the salt tolerance of each sample. The results showed that there were significant differences in various indexes of L.heterophyllus, with the coefficient of variation ranging from 13.58% to 59.89%. The four indexes of the above-ground fresh weight, above-ground dry weight, root fresh weight, and leaf area were greatly affected by salt stress, and there were varying degrees of correlation among the 12 indexes. Chlorophyll content, main root diameter, dry and fresh weight of above-ground parts as well as dry and fresh weight of roots were identified as indicators for evaluating the salt tolerance of L.heterophyllus at the seedling stage. Based on the salt tolerance score and the comprehensive evaluation of salt tolerance, HY199 and HY203 were identified as the most salt-tolerant L.heterophyllus. The above results provide theoretical guidelines for the cultivation of L.heterophyllus in saline-alkali areas.

Key words: Leonurus heterophyllus, salt resistance, membership function analysis, principal component analysis