Fig. 1

Phenotypic analysis of tetraploid and diploid cotton varieties under salt stress. a The symptoms on both tetraploid (G. hirsutum) and diploid (G. arboreum and G. raimondii) cotton varieties under salt stress. The 4-week-old cotton seedlings were irrigated with water (mock) or 300 mM NaCl solution for 12 days. b The plant height of mock and salt-treated cotton seedlings. c Quantitative measurement of Na⁺ content of mock and salt-treated cotton seedlings. The standard deviations were calculated from the results of three independent experiments (n ≥ 16, * p < 0.05, ** p < 0.01; t-test)