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采用温室盆栽控制试验,研究0、50、100和150 mmol·L~(-1) Na Cl胁迫对‘中山杉302’和‘中山杉406’一年生扦插苗的生长和矿质离子吸收、运输和分配的影响。结果表明:(1)50 mmol·L~(-1) Na Cl胁迫下‘中山杉302’苗木相对生长量显著高于对照,而‘中山杉406’与对照无显著差异;150 mmol·L~(-1) Na Cl胁迫下,‘中山杉406’苗木相对生长量和存活率均高于‘中山杉302’,说明‘中山杉302’对低盐胁迫表现出较强的盐适应力,而‘中山杉406’对高盐胁迫抗性较强;(2)50 mmol·L~(-1) Na Cl胁迫下‘中山杉302’茎、叶能维持相对较低的Na~+水平,同时由根向地上部分选择性运输K~+、Ca~(2+)、Mg~(2+)的能力较强;150 mmol·L~(-1) NaCl胁迫下,‘中山杉406’则比‘中山杉302’具有更强的选择性吸收和运输K~+、Ca~(2+)、Mg~(2+)的能力,以保持植物体内Na~+与K~+、Ca~(2+)、Mg~(2+)的离子之间平衡,2个不同无性系在不同盐浓度胁迫下的适应性差异与其对矿质元素吸收及平衡特性有关。
The greenhouse pot experiment was conducted to study the effects of 0, 50, 100 and 150 mmol·L -1 NaCl stress on the growth and mineral ion absorption, transport and distribution of annual cuttings of ’Zhongshang 302’ and ’Zhongshanshu 406’ Impact. The results showed that: (1) The relative growth of ’Zhongsan-302’ seedlings under 50 mmol·L -1 NaCl stress was significantly higher than that of the control, but there was no significant difference between ’Zhongshanshan 406’ and the control; 150 mmol·L -1 (-1) Under NaCl stress, the relative growth and survival rate of ’Zhongshanshan 406’ seedlings were higher than that of ’Zhongshanshan 302’, indicating that ’Zhongshan 302’ showed strong salt adaptability to low salt stress, ’Zhongshan fir 406’ was highly resistant to high salt stress; (2) Under the condition of 50 mmol·L -1 NaCl, the stems and leaves of ’Zhongshanshan 302’ could maintain a relatively low level of Na + The ability of selective transportation of K ~ +, Ca ~ (2 +) and Mg ~ (2+) from root to shoot was stronger than that of ’Zhongshanshan 406’ under 150 mmol·L ~ (-1) NaCl stress ’Zhongsanshan 302’ has the ability to selectively absorb and transport K ~ +, Ca ~ (2 +) and Mg ~ (2+) in order to keep Na + and K +, Ca ~ (2) +) And Mg 2+ ions. The differences in the adaptability of two different clones under different salt concentrations are related to their absorption and balance of mineral elements.