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Acta Prataculturae Sinica ›› 2024, Vol. 33 ›› Issue (5): 58-68.DOI: 10.11686/cyxb2023228

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Evaluation and screening of the salt tolerance of triticale germplasm at the germination and seedling stages

Meng WANG1(), Xue-li LU2,3,4, Ju-ying WANG3, Meng-chao ZHANG2,5, Yi-ru SONG1,2, Chen MENG2,3,4, Li ZHANG5, Zong-chang XU2,3,4()   

  1. 1.College of Agriculture,Qingdao Agricultural University,Qingdao 266109,China
    2.Marine Agriculture Research Center,Tobacco Research Institute of Chinese Academy of Agricultural Sciences,Qingdao 266100,China
    3.Qingdao Key Laboratory of Resources Mining and Biological Breeding in Coastal Saline-alkali Land,Qingdao 266100,China
    4.National Center of Technology Innovation for Comprehensive Utilization of Saline-alkali Land,Dongying 257345,China
    5.College of Agriculture,Shanxi Agricultural University,Jinzhong 034100,China
  • Received:2023-07-04 Revised:2023-08-11 Online:2024-05-20 Published:2024-02-03
  • Contact: Zong-chang XU

Abstract:

Salinized soil is an important standby cultivated land resource, but salt-tolerant crop varieties are required to use salinized land for agriculture. In this study, 14 triticale (Triticosecale wittmack) germplasm lines from America and six Chinese provinces were treated with 0.9% and 1.2% (w/v) NaCl during the germination and seedling stages, respectively. The salt tolerance of triticale germplasm lines at the germination and seedling stages was evaluated and screened by measuring the germination rate, germination energy, and germination index, as well as plant height, root length, dry/fresh weight of aboveground, dry/fresh weight of roots, proline and malonaldehyde contents, and superoxide dismutase activity. The results showed that there were was abundant variation in these indexes among the salt-treated triticale materials at the germination and seedling stages, with the coefficient of variation ranging from 6.53% to 99.65%. Compared with the agronomic indexes, the physiological indexes were more strongly affected by salt stress. The salt tolerance of triticale germplasm resources at the germination stage and seedling stage was evaluated using multivariate statistical methods such as the membership function method and principal component analysis. A correlation analysis between the membership function value ranking at the germination stage and the D-value ranking at the seedling stage showed that the salt tolerance at the seedling stage was significantly positively correlated with that at the germination stage. Overall, we identified eight salt-tolerant germplasm lines at the germination stage, and one very salt-tolerant line and eight salt-tolerant lines at the seedling stage. The two most salt-tolerant materials at the germination and seedling stages were Gannong No.4 and Jisi No.2. Thus, these two materials were identified as excellent triticale resources for cultivation in saline-alkali soils and for breeding new salt-tolerant cultivars.

Key words: triticale, salt stress, germination stage, seedling stage, salt tolerance, germplasm resources