PDF(Pubmed)
Abstract：
The adaption of plants to stressful environments depends on long-distance responses in plant organs, which themselves are remote from sites of perception of external stimuli. Jasmonic acid (JA) and its derivatives are known to be involved in plants\' adaptation to salinity. However, to our knowledge, the transport of JAs from roots to shoots has not been studied in relation to the responses of shoots to root salt treatment. We detected a salt-induced increase in the content of JAs in the roots, xylem sap, and leaves of pea plants related to changes in transpiration. Similarities between the localization of JA and lipid transfer proteins (LTPs) around vascular tissues were detected with immunohistochemistry, while immunoblotting revealed the presence of LTPs in the xylem sap of pea plants and its increase with salinity. Furthermore, we compared the effects of exogenous MeJA and salt treatment on the accumulation of JAs in leaves and their impact on transpiration. Our results indicate that salt-induced changes in JA concentrations in roots and xylem sap are the source of accumulation of these hormones in leaves leading to associated changes in transpiration. Furthermore, they suggest the possible involvement of LTPs in the loading/unloading of JAs into/from the xylem and its xylem transport.
摘要：
植物对压力环境的适应取决于植物器官的远距离反应，它们本身远离外部刺激的感知部位。已知茉莉酸(JA)及其衍生物参与植物对盐度的适应。然而,根据我们的知识，尚未研究JAs从根到芽的运输与芽对根盐处理的反应有关。我们检测到盐引起的根中JAs含量的增加，木质部树液,和豌豆植物的叶片与蒸腾作用的变化有关。免疫组织化学检测血管组织周围JA和脂质转移蛋白（LTPs）定位的相似性，而免疫印迹显示豌豆植物木质部汁液中存在LTPs，并且随着盐度的增加而增加。此外，我们比较了外源MeJA和盐处理对叶片中JAs积累的影响及其对蒸腾作用的影响。我们的结果表明，盐诱导的根和木质部汁液中JA浓度的变化是这些激素在叶片中积累的来源，导致蒸腾作用的相关变化。此外，他们建议LTPs可能参与JAs进出木质部及其木质部运输的装卸。
