ABSTRACT

Salt stress is considered one of the major constraints limiting plant growth. Here, tomato plants were grown in hydroponic culture with two salt sodium chloride concentrations (S1 = 2.8 dS m⁻¹ and S2 = 4.8 dS m⁻¹). Under salt treatment, a significant decrease in chlorophyll content index and shoot and root dry weight were observed. We found that copper (Cu) was accumulated significantly in the shoot and sodium (Na) was significantly accumulated in the root. Furthermore, a significant nutrient imbalance indicated by a decrease in phosphorus (P), and potassium (K) uptake was measured. These decreases were accompanied by an increase in Na and Cu contents. A decrease in chlorophyll fluorescence yield was also observed indicating an inhibition at photosystem I acceptor sites. It seems that the downregulation of the electron transport between photosystem II and photosystem II under salt stress could be due to an imbalance in nutrient uptake.

摘要

盐胁迫被认为是限制植物生长的主要限制之一。在这里，番茄植物在水培条件下种植了两种盐浓度的氯化钠（S1 = 2.8 dS m ^-1和S2 = 4.8 dS m ^-1）。在盐处理下，观察到叶绿素含量指数以及枝条和根的干重显着降低。我们发现铜（Cu）在茎中大量积累，而钠（Na）在根中大量积累。此外，测量到显着的营养失衡，表明磷（P）和钾（K）吸收减少。这些减少伴随着钠和铜含量的增加。还观察到叶绿素荧光产量降低，表明在光系统I受体位点被抑制。似乎在盐胁迫下光系统II和光系统II之间电子传输的下调可能是由于养分吸收的不平衡所致。