盐胁迫下舟山新木姜子1年生苗形态变化及生理反应

Morphological and physiological changes accompanying the induction of salt tolerance in Neolitsea sericea seedlings

为探明舟山新木姜子Neolitsea sericea的耐盐机制，用水培的方式以氯化钠（NaCl）溶液作为渗透胁迫剂模拟盐胁迫环境，试验了舟山新木姜子1年生苗的耐盐性。形态观察及生理指标测定表明，随着盐质量浓度的升高，游离脯氨酸质量分数升高（3．373～3．749mg·g^-1），Na^＋/K^＋ 由0．087上升到0．119，膜透性增加（41．30％～61．42％），叶绿素质量分数下降（14．08～11．03mg·g^-1），引起苗高生长量、地径生长量、新芽数和新根数明显下降；随着胁迫时间的延长，游离脯氨酸质量分数和电导率上升趋缓，叶绿素质量分数小幅回升。方差分析表明，受试苗木在9g·L^-1 NaCl处理下生长受抑制，达显著水平。舟山新木姜子能耐受6g·L^-1 NaCl处理，属中度耐盐树种。

To understand the mechanism of salt tolerance in Neolitsea sericea （sericeous newlitse）, physiological and morphological expression studies were done. Water culture of sericeous newlitse＇s one year old seedlings were reduced. But the proline, conductivity and chlorophyll recovered lightly over time. Analysis of variance showed that the one-year-old seedling＇s growth in 9 g· L^- 1 NaC1 were inhibited and significantly different （ P 〈 0.05） contracted with other treatments. Sericeous newlitse is a moderated salt tolerated tree species. [ Ch, 5 fig. 21 ref. ]