Purpose To explore the adaptability of seed germination and seedling growth of Brassica oleracea var. capitata L. (BOC) to salt stress, providing references for the study of growth environment of cabbage and the utilization of saline-alkali land.
Methods The BOC was used as a test material, and the 0, 50, 100, 200, 250 and 300 mg/L NaCl stress gradients were set up to analyze the effects of salt stress on the seed germination and seedling growth of BOC.
Results 50 mg/L NaCl had no significant effect on the germination of BOC seeds and the growth of seedlings. 100-300 mg/L NaCl significantly inhibited seed germination, and the germination rate, germination potential, germination index, and vigor index all decreased with the increase of the mass concentration of salt stress, of which 300 mg/L salt stress led to the complete loss of seed vigor. 100-300 mg/L NaCl caused a decrease in biomass, relative chlorophyll content, root vigor, but an increase in relative conductivity, malondialdehyde content, proline content, soluble sugar content, and catalase activity of BOC.
Conclusion BOC is tolerant to low mass concentrations (≤100 mg/L) of salt stress, while high mass concentrations (>100 mg/L) inhibit its seed germination and seedling growth, but BOC also regulates its physiological and metabolic functions by increasing the content of osmotic regulatory substances in the body and improving the activity of antioxidant enzymes to cope with salt-stressed environments.
DownLoad: