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应用水培法研究了NaCl胁迫对甘薯不同耐盐性品种的生理影响。结果表明,叶片细胞质膜透性、Na~+含量和游离脯氨酸积累均随NaCl浓度提高而显著提高,叶片含水量、K~+含量、K/Na比及叶绿素含量与之相反。在NaCl逆境下,耐盐性强的品种质膜透性及Na~+含量的增加幅度,K~+含量、叶片含水率及叶绿素含量的下降幅度均显著小于耐盐性差的品种;而脯氨酸的积累速度前者显著高于后者。质膜透性与Na~+含量呈极显著正相关,但二者均与叶片含水量、幼苗存活率、K/Na比以及叶绿素含量有极显著相关关系。因此,Na~+的积累及次生水分胁迫是导致膜伤害的主要原因,质膜透性可以作为甘薯耐盐性生理参数之一。
Hydroponics was used to study the physiological effects of NaCl stress on sweet potato varieties with different salt tolerance. The results showed that the leaf plasma membrane permeability, Na ~ + content and free proline accumulation were significantly increased with the increase of NaCl concentration. Leaf water content, K ~ + content, K / Na ratio and chlorophyll content were the opposite. Under NaCl stress, the permeability of plasma membrane and the increase range of Na ~ + content, K ~ + content, leaf water content and chlorophyll content of salt tolerant varieties were significantly lower than those of poor salt tolerance; while proline The former is significantly higher than the latter. There was a significant positive correlation between plasma membrane permeability and Na ~ + content, but both were significantly correlated with leaf water content, seedling survival rate, K / Na ratio and chlorophyll content. Therefore, Na ~ + accumulation and secondary water stress are the main reasons leading to membrane injury, and membrane permeability can be regarded as one of the physiological parameters of salt-tolerance of sweet potato.