盐处理对碱蓬生长及叶绿体超微结构的影响

Effect of NaCl Stress on Growth and Ultrastructure of Chloroplast of Suaeda salsa

[目的]研究盐处理对碱蓬生长及叶绿体超微结构的影响。[方法]用含有0、100、200、500 mmol/L NaCl的溶液处理碱蓬幼苗,处理10 d后测定幼苗鲜重、干重、叶绿素含量、光合速率、叶绿体超微结构、气孔导度及细胞间隙CO2浓度等指标。[结果]一定浓度的NaCl促进了碱蓬的生长。200 mmol/L NaCl是碱蓬生长的最适盐度,使Pn升高,Gs升高,Ci升高,叶绿体结构未受影响;而500 mmol/L NaCl使Pn、Gs降低,Ci升高,叶绿体超微结构受到破坏。盐处理条件下叶绿素a含量先升高后降低,叶绿素b含量先降低后升高。[结论]高盐度时碱蓬光合速率的降低是由非气孔因素引起的。

[ Objective ] The aim was to study effect of NaC1 stress on growth and ultrastructure of chloroplast of Suaeda salsa. [ Method ] Seed- iings of Su, aeda salsa were treated with different NaCI（0, 100,200,500 retool/L） for 10 days, then the fresh weight, dry weight, photosynthesis rate, ultrastructure of chloroplast and other parameters were measured. [ Result ] NaC1 could promote the growth of Suaeda salsa. When NaC1 concentration was about 200 mmol/L, Suaeda salsa grew the strongest. Photosynthesis rate Ci, and Gs increased with the salinity under 100 -200 mmol/L NaCL Photosynthesis rate and Gs declined under 500 mmol/L NaC1, but C~ increased. Uitrastructure of chloroplast was destroyed by 500 NaC1 mmol/L. After salt treatment, Chla contents increased firstly, then increased with the increasing of NaC1 concentrations, but Chlb content declined under 0 - 100 mmol/L NaC1 and increased under 500 mmol/L NaC1. [ Conclusion] The decrease of photosynthetic rate was caused by non stomatal factors under high salinity stress.