黄河三角洲贝壳堤岛二色补血草生长和保护酶特性对盐胁迫的响应

用不同浓度的NaCl溶液(0,50,100,200,300 mmol/L)模拟盐胁迫,研究盐胁迫对二色补血草幼苗生长特性及保护酶系统的影响.结果表明:(1)100和200 mmol/L盐胁迫下,根长和叶片数分别为对照的1.3,1.67倍,根(叶)鲜重、干重显著高于对照;根鲜重和叶干重在100 mmol/L盐胁迫下最高,分别为对照的1.35,1.6倍;300 mmol/L盐胁迫下,根长和叶片数均为对照的0.78倍,根(叶)鲜重、干重分别为对照的0.67(0.79)和0.85(0.69).地上、地下生物量受盐胁迫的抑制程度大小不明显.(2)随着盐胁迫的增加,二色补血草叶片中SOD,POD,CAT 3种保护酶活性均呈上升趋势,在盐浓度为300 mmol/L时活性最大,分别为对照的2.12,1.83,2.57倍;MDA含量在盐浓度300 mmol/L下,才显著高于对照,为对照的1.6倍.(3)从研究结果初步判定,二色补血草具有较强的耐盐性,可以在盐浓度300 mmol/L以下的环境中生长.

Repones on Salt Stress on Characteristics of Growth and Protective Enzymes of Limonium Bicolor in Shell Islands of the Yellow River Delta

The effects of salt stress on the characteristics of growth and protective enzymes were studied using Limonium bicolor (Bunge) Kuntze.seedlings.Five treatments were arranged:0,50,100,200,and 300 mmol/L.Results showed that (1) At 100 and 200 mmol/L salt stress,the roots length and leaves number of Limonium bicolor were 1.3 and 1.67 times of those of the control,respectively.Fresh weight and dry weight of roots (leaves) were significantly higher than those of the control.Fresh weight of roots and dry weight o...