Fig. 6

Nano-Se improves seedling growth under two different concentrations of NaCl. a Impact of selenium treatments on the germination characteristics [FG%: final germination percentage; GR: germination rate; VI (I): vigor index I and VI (II): vigor index II] under two concentrations of salt stress. b and c Seven-day-old seedlings phenotypes grown under two NaCl concentrations: b 150 mM NaCl and c 200 mM NaCl combined with different levels of SeNPs and Se (IV) (0, 50, 100 and 150 µmol/L). Scale bar = 1 cm. d–g Impact of selenium treatments on d shoot length; e root length; f shoot fresh weight and g root fresh weight under two concentrations of salt stress during the early seedling stage. Bars represent ± SE of three replicates. The different letters indicate significant differences at P < 0.05 using Duncan's multiple range tests