BRs, photosynthetic pigments, and chlorophyll fluorescence parameters in Cinnamomum camphora seedlings with NaCl stress
To provide a theoretical basis for improvement of Cinnamomum camphora (camphor) salt resistance, a photosynthetic adjustment function of the brassinosteroids (BRs) root treatment to camphor with NaCl stress was studied. Potted plants having different concentrations (0.1, 0.2 and 0.3 mg·L-1) of BR root treatments were added to camphor seedlings with distilled water as a control. Salt stress was applied with NaCl concentrations of 0, 50, 100, and 150 mmol·L-1, 3 replications was designed. Results showed that BRs reduced the salt injury index. With an increase in salt concentration, BRs also lessened the decrease in Chla, Chlb, Chl, Car, and Chla/b; improved the increase in range of Car/Chl. When the salt concentrations from 100 mmol·L-1 to 150 mmol·L-1, BRs can inhibit the decrease in Chla/b and the increase in range of Car/Chl signifigantly (P<0.05). BRs can also improved the relative water content of leaves, Fv/Fm, Fv/Fo, Fv′/Fm′, and ФPSⅡfor salt stress with higher values; improved the photochemical energy dissipation, and when the concentrations of BRs is 0.2 and 0.3 mg·L-1, it can improved the relative water, Fv/Fm, Fv/Fo and the photochemical energy dissipation signifi-gantly (P<0.05). Thus, with camphor, BRs were beneficial for capturing, absorbing, transferring, and convert-ing light energy, for improving leaf photosynthetic activity, for alleviating the impact of high salt stress on the photosynthetic system, and for reducing the inhibitive effect of high salt on camphor.
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