摘要
分别用含有 0、10 0、2 0 0、40 0mmolL-1NaCl的Hoagland培养液处理真盐生植物海蓬子 (Salicorniaeu ropaea)、盐地碱蓬 (Suaedasalsa) ,含有 0、10 0、2 0 0mmolL-1NaCl的Hoagland培养液处理泌盐植物二色补血草(Limoniumbicolor)、滨藜 (Atriplexspongiosa)、獐毛 (Aleuropussinensis)和隐花草 (Crypsisaculenta)幼苗 .处理一定时间后测定其鲜重、干重、有机干重、有机和无机渗透调节剂、渗透调节能力、渗透势、c(Na) /c(K)、c(Suc) /c(SS)等 .结果发现 ,在较适盐度下 ,实验植物的干鲜重、有机干重和含水量均随盐度增高而增大 ,而在高盐度下则大部分植物受到抑制 .双子叶植物和单子叶植物的无机渗透调节剂Na+、Cl-含量均随盐度升高而增大 ,双子叶植物的增幅大于单子叶植物 ,c(Na) /c(K)也高于单子叶植物 .双子叶盐生植物的有机渗调剂在渗调中的贡献随外界盐度的升高而降低 ,而单子叶盐生植物则相反 ,其可溶性糖含量远高于双子叶植物 ,蔗糖含量尤其突出 ,c(Suc) /c(SS)也大于双子叶植物 .双子叶植物的渗透调节能力大于单子叶植物 ,真盐生植物的渗透调节能力大于泌盐植物 .另外 ,6种植物的实测渗透势大于计算渗透势 ,证明实验植物中还有一些未测定的渗透调节物质 .本文还讨论了双子叶植物与单子叶植物、?
Salicornia europaea and Suaeda salsa seedlings were treated with Hoagland solution added with 0,100,200 or 400 mmol L -1 NaCl, while the seedlings of Limonium bicolor , Atriplex spongiosa , Aleuropus sinensis and Crypsis aculenta were treated with Hoagland solution added with 0,100 or 200 mmol L -1 NaCl. Some time later (10 to 20 d), the fresh weight, dry weight, organic dry weight, water content, organic osmotica, inorganic osmotica, osmotic adjustment ability, osmotic potential, c (Na)/ c (K) and c (Suc)/ c (SS) were determined, respectively. The results showed that the plants grew best at optimal NaCl concentrations, but they were inhibited at higher NaCl concentrations. The contents of inorganic osmotica Na and Cl of the dicotyledons and monocotyledons increased with the rise of NaCl concentration, and the increasing range was bigger in dicotyledons than that in monocotyledons. c (Na)/ c (K) was also higher in dicotyledons than that in monocotyledons. On the contrary, the organic osmotica in the dicotyledons decreased with the rise of NaCl concentration, while increased in the monocotyledons, which also contained high soluble sugar and high c (Suc)/ c (SS). Furthermore, the osmotic adjustment ability of the dicotyledons was higher than that of the monocotyledons, so it is with eu halophytes rather than recretohalophytes. Moreover, the determined osmotic potential was higher than the calculated osmotica potential in the experiment, which implies that there still exist other osmotica in the plants that are not determined. The reasons for the differences between dicotyledons and monocotyledons, and the eu halophytes and recretohalophytes are also discussed in this paper. Fig 3, Tab 4, Ref 24
出处
《应用与环境生物学报》
CAS
CSCD
2000年第2期99-105,共7页
Chinese Journal of Applied and Environmental Biology
基金
国家自然科学基金!(No:396 7008)
国家重点基础研究发展规划项目!(G199011700)
关键词
渗透调节剂
盐胁迫
真盐生植物
泌盐植物
Salicornia europaea
Suaeda salsa
Limonium bicolor
Atriplex spongiosa
Aleuropus sinensis
Crypsis aculenta
osmotica
osmotic adjustment ability
salt stress
