盐胁迫对香椿幼苗生长和光合特性的影响

Effects of salt stress on growth and photosynthetic characteristics of Toona sinensis

本研究采用水培方式,设置不同梯度NaCl浓度(0、100、150、200和250 mmol·L^(-1)),对四个月生的香椿幼苗进行处理,并进行相关生长和光合生理指标测定。结果表明:随着NaCl浓度提高,香椿幼苗叶长、叶宽和株高呈降低趋势;同样经NaCl处理的香椿叶片净光合速率、蒸腾速率和气孔导度也显著降低,均与对照差异显著(p<0.05),而经150mmol·L^(-1)NaCl处理的叶宽、净光合速率、蒸腾速率和气孔导度与200 mmol·L^(-1)NaCl下没有显著差异(p>0.05)。由此可知,盐胁迫影响了香椿的光合生理作用,进而影响了香椿幼苗的生长,为探讨香椿的盐胁迫响应机制提供了理论依据。

Different levels of NaCl concentrations (0, 100, 150, 200 and 250 mmol·L^-1) were set up by water culture method to treat T. sinensis seedlings in this study, and relevant growth and photosynthetic characteristics were determined. The results showed that the leaf length, width and height of T. sinensis seedlings decreased with the increase of NaCl concentration. The net photosynthetic rate, transpiration rate and stomatal conductance of seedlings treated with NaCl also decreased significantly, which were significantly different from the control (p<0.05), and leaf width, net photosynthetic rate, transpiration rate and stomatal conductance of seedlings treated with 150 mmol·L^-1 NaCl were not significantly different from those at 200 mmol·L^-1 NaCl (p>0.05). The above results showed that salt stress affected the photosynthesis of T. sinensis, and further affected the growth of T. sinensis seedlings, which provided a theoretical basis for exploring the salt stress response mechanism of T. sinensis.