盐胁迫及其钙调节对竹子根系活力和丙二醛含量的影响

EFFECTS OF SALT-STRESS AND Ca￣(2+) REGULATION ON BAMBOO ROOT VIABILITY AND MDA CONTENT

选用了６个竹种进行耐盐性研究。在盐胁迫下，各竹种的根活力有所下降，竹笋和叶片中ＭＤＡ则随之积累。然而多数竹种对盐胁迫表现出一定的适应性。随着处理时间延长，根活力得到部分回复，膜脂地氧化程度减轻。盐胁迫下竹种之间根活力和ＭＤＡ含量变化存在一定的差异。Ｃａ￣（２＋）对翠竹的氯化钠盐害有明显的缓解作用。Ｃａ￣（２＋）处理可显著地抑制氯化钠诱导的ＭＤＡ积累，部分恢复盐胁迫下的根系活力。

In this peper, the salt-stress responses in six species of bamboo were studied. Under saltstress, the root viability of all species and the malondialdehyde (MDA) content in bamboo shoots andleaves decreased and increased, respectively. Most of the species showed some adaptability to NaCltreatment, With prolonging duration of tteatment, the root viability was Partially recovered and the degree of membrane -lipid peroxidation was alleviated. The changes in root viability and MDA contentshowed to some extent difference among those species. Addition of Ca￣(2+) markedly alleviated the effectsof salinity on Arundinaria var. disticha. The NaCl-induced accumulation of MDA was significantly inhibited by supplemental Ca￣(2+). The exogenous calcium recovered pert of the root viabilitycauced by NaCl stress.