沙枣和柠条种子萌发期耐盐性研究

Salt Tolerance of Elaeagnus angustifolia L.and Caragana korshinskii Kom.During Germination

采用室内控制实验的方法,系统研究了沙枣和柠条种子萌发、生长、活力以及生理过程;对萌发、生长及活力指标与盐胁迫进行相关与回归分析,发现了实验室条件下沙枣和柠条种子萌发期的耐盐临界值;对生理指标与盐胁迫,生理指标与相应的萌发及生长指标进行相关性分析,在生理水平对沙枣和柠条种子萌发期对盐胁迫的响应进行了解释。主要结果包括:(1)胚根相对干重含水量与盐胁迫无相关性,初始萌发时间、休眠率以及死亡率与盐胁迫呈显著正相关,其它指标均与盐胁迫呈显著负相关;(2)胚根相对干重含水量与萌发种子初期生长无相关性,休眠率、死亡率与萌发率呈显著负相关,其它指标均与初期生长呈显著正相关;(3)受盐胁迫的抑制程度:萌发速度>萌发启动>萌发率;胚根生长>胚轴生长>萌发率;(4)种子萌发期,沙枣耐盐性强于柠条,两者耐盐临界值均高于0.1 mo.lL-1。

The indexes of germination, growth, vigor and physiology of E. angustifolia L. and C. korshinskii Kom. during germination were observed. The correlation and regression analyses were done between the indexes of germination, growth and vigor and salinity, through which the critical concentrations of E. angustifolia L. and C. korshinskii Kom. during germination were gotten. And the correlation analyses were done between physiological indexes and salinity, physiological indexes and corresponding germination and growth indexes respectively, which threw a light on the germination and growth responses of E. angustifolia L. and C. korshinskii Kom. to salt stress at the physiological level. The results were gotten as follow： （1）Radicle hydration percentage had no correlation with salinity, while initial germination time, dormancy and death were positively correlated with salinity, and all the other indexes were negatively correlated with salinity; （2）Radicle hydration percentage had no correlation with early growth all the of germinated seeds, while dormancy and death were negatively correlated with germination and other physiological indexes were positively correlated with growth ; （ 3 ） Among the three aspects of germination, germination velocity was most inhibited by salinity, while germination percentage was lest, and germination initiation was in-between. And early growth was more sensible to salinity than germination percentage, moreover, radicle growth was more inhibited than hypocotyl growth; （4）E. angustifolia L. was more tolerant to NaCl stress than C. korshinskii Kom. , species were higher than 0. 1 mol · L^-1 during germination.