NaCl胁迫对海蓬子(Salicornia bigelovii Torr.)离子区室化、光合作用和生长的影响

Effect of NaCl Stress on Ion Compartmentation, Photosynthesis and Growth of Salicornia bigelovii Torr.

用含有0、100、300、600 mmol/L的NaCl的Hoagland培养液处理海蓬子幼苗,处理一定时间后测定其鲜重、干重、离子含量、Na+/K+比值、Na+在细胞中的分布、光合速率、叶绿体超微结构等的变化。结果表明一定浓度NaCl处理促进了海蓬子的生长,300mmol/L左右的NaCl是海蓬子生长的最适盐度。盐处理条件下海蓬子主要将Na+、Cl-积累在地上部,且主要储存在液泡中。随盐处理浓度的增加海蓬子地上部的Na+/K+比增大;光合速率在低盐度下随盐浓度的升高而增大,高盐度下受到抑制;叶绿体超微结构在高盐度下受到部分破坏。

Seedlings of Salicornia bigelovii Torwere treated with different concentrations oNaCl(0, 100, 300, 600 mmol/L). Ion contentsNa+ subcelluar localization, photosynthetic rateultrastructure of chloroplast and other parameterwere measured. The data showed both fresh andry weight of whole plant of Salicornia bigeloviTorr. under salinity were higher than the controWhen NaCl concentration is about 300 mmol/LSalicornia bigelovii Torr. grow strongest(Fig1). The contents of Na+and Cl- and c(Na)/c(Kin shoots increased with the salinity(Figs.2 an3). Both Na+ and Cl- were mainly transported tshoots(Fig.2). Ion X-ray microanalysis indicateNa+ was mainly compartmentalized into vacuoles(Fig.4). Photosynthetic rate increased with thesalinity under NaCl 100300 mmol/L (Fig.5) ,but declined under NaCl 600 mmol/L. Ultra-structure of chloroplast was destroyed by NaCl600 mmol/L (Fig.6).