In order to gain rapeseed(Brassica napus) germplasm suitable for planting in saline alkali land and achieve comprehensive utilization of the saline soil, in this study, 6 rapeseed germplasm materials including Westar, G101, G112, bgr5, ZS11, and G135 were selected from 523 rapeseed germplasms tested by paper bed with 1.5% of NaCl. Systematic evaluation encompassed germination rates and various growth parameters of the materials under agar salt stress and potted salt stress, including hypocotyl and root lengths, as well as fresh weight and physiological indices(SOD, CAT, proline, etc.). The results showed that G135 exhibited superior performance under saline stress conditions on 1/2 MS medium, displaying enhanced germination rates, elongation of hypocotyls and roots, and superior fresh weight compared to other 5 germplasms. The order of the salt-tolerance ability of the 6 germplasms was G135 > Westar > bgr5 > G112 > ZS11 > G101 after comprehensive evaluation by membership function. In the pot trials, the growth parameters of G135 were also superior to those of other 5 germplasms under the salt stress, and membership function analysis reiterated G135's preeminence in salt tolerance, surpassing G112, Westar, ZS11, G101, and bgr5. Six germplasms were subjected to 0.8% of NaCl stress at the seedling stage in the pot trial, and the antioxidant enzyme activity and proline content of G135 were higher than those of other treatments. After comprehensive evaluation by membership function, the order of the salt tolerance of 6 germplasms was G135 > G112 > Westar > bgr5 > ZS11 > G101. In conclusion, G135, as a salt-tolerant germplasm, showed stable and highly salt-tolerant ability, and could be used for salt-tolerant breeding for rapeseed and study on molecular mechanism of salt-tolerance.
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