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在水培条件下,本文探讨了NaCl胁迫对青檀种子发芽率、叶气体交换和苗木生长的影响。研究结果表明,NaCl胁迫延长了青檀种子的发芽时间,特别是当NaCl浓度超过17mM(1.0g/L)时,发芽率明显降低;NaCl胁迫降低了青檀叶的呼吸速率、气孔导度和净光合速率,并随着NaCl胁迫浓度的提高,下降的幅度更大,但NaCl胁迫苗木胞间隙CO2浓度明显高于对照;与对照相比,在NaCl胁迫50天后,青檀苗木的成活率、苗高和地径生长以及根系、茎和叶生物量显著降低,但茎和叶生物量下降更为明显。本文的研究结果认为,青檀是一种对盐胁迫较敏感的植物,一年生幼苗的耐盐阈值在34mM(2.0g/L)左右。图2表3参27。
Under hydroponic conditions, the effects of NaCl stress on germination rate, leaf gas exchange and seedling growth of P. erectosa were studied. The results showed that the NaCl stress prolonged the germination time of the sandalwood seed, especially when the NaCl concentration was over 17mM (1.0g / L), the germination rate was significantly reduced; NaCl stress decreased the respiration rate, stomatal conductance and Net photosynthetic rate, and with the increase of NaCl stress, the decline extent is greater, but the CO2 concentration in seedling interstitial of NaCl stress is obviously higher than that of the control; Compared with the control, after 50 days of NaCl stress, the survival rate, The seedling height and diameter growth as well as the biomass of roots, stems and leaves decreased significantly, but the biomass of stems and leaves decreased more obviously. The results of this study suggest that P. septentrionalis is a sensitive plant to salt stress. The salt tolerance threshold of annual seedlings is about 34mM (2.0g / L). Figure 2 Table 3 Reference 27.