氯化钠胁迫对雷竹根系活力和细胞膜透性的影响

为了研究雷竹Phyllostachys violascens在氯化钠胁迫下的耐盐能力，通过不同质量浓度氯化钠处理的1年生盆栽模拟试验，对氯化钠胁迫对雷竹根系活力和细胞膜透性的影响进行了分析。结果表明：氯化钠胁迫下根系活力对照最高为12．83μg·g^-1·h^-1，其次是3．0g·L^-1氯化钠处理为10．80μg·g^-1·h^-1，与对照没有显著性差异（P=0．326），5．0g·L^-1氯化钠处理最低，为7．22μg·g^-1·h^-1，与对照有显著性差异（P=0．008）。在氯化钠胁迫的前期雷竹对胁迫有一定的应激能力，根系能够保持较高的活力，但随着氯化钠胁迫的加重和时间的推移，根系受到损伤，活力下降；细胞膜透性随氯化钠胁迫质量浓度的变化而变化，对照处理的细胞膜透性最小为6．03％，1．0和3．0g·L^-1氯化钠处理的细胞膜透性基本一致，分别为6．97％和6．93％，而5．0g·L^-1氯化钠处理的细胞膜透性明显上升为8．75％，在氯化钠胁迫前期细胞膜透性的变化比较剧烈，而后期就比较平稳。

Root activity and cell membrane permeability in Phyllostachys violascens with NaCl stress

In order to expand Phyllostachys violascens planting area, we try to find the reason of Ph. violascens fail to grow well even decay and death in the saline-alkali land, therefore salt tolerance in Phyllostachys violascens with NaCl stress is studied, root activity and cell membrane permeability were studied in a pot culture experiment with a different concentration of NaCl （mass concentration, respectively 0, 1.0 , 3.0, 5.0 g.L^-1） treatments：（1） 12.83 μg.g^-1.h^-1 treated with 0 g.L^-1 NaCl solution, （2） 9.4 μg.g^-1.h^-1 treated with 1.0 g.L^-1 NaCl solution, （3） 10.80 μg.g^-1.h^-1 treated with 3.0 g.L^-1 NaCl solution, （4） 7.22 μg.g^-1.h^-1 treated with 5.0 g. L^-1 NaCl solution. Results showed that Treatment 1 made roots the most active, Treatment 3 was not significantly different from the control （P = 0.326）, and Treatment 4 was signifibantly different from the control （P = 0.008）. Ph. violascens showed some adaptability under NaCl stress with higher root activity in the earlier stages. However, the root system was damaged, and vigor declined over time. Cell membrane perme- ability of the Treatment 1 was 6.03%; there were no significant differences with Treatments 2 （6.97%）or 3 （6.93%）, but Treatment 4 was greater at 8.75%. Overall, changes in cell membrane permeability were greater in the early stages of NaCl stress treatment and more stable in the later stages.