盐胁迫下沙棘的渗透调节效应

<title>Osmotic adjustment effect of Hippophae rhamnoides L. under salt\|stress

分别用含有0、100、200和300mmol LNaCl的Hoagland培养液处理1年生沙棘(HippophaerhamnoidesL.)苗30d后,测定其鲜重,干重,含水量,可溶性糖、脯氨酸和无机离子(Na+、Cl-)的含量及叶片渗透势和渗透调节能力。结果表明:100mmol LNaCl处理的沙棘地上部和根的鲜重和干重最大,其含水量也最大;NaCl浓度超过100mmol L时,沙棘地上部分和根的鲜重和干重随盐浓度增加而逐步下降,其下降的趋势为地上部大于根部。随NaCl浓度不断升高,沙棘体内Na+和Cl-浓度随之升高,茎叶和根系中Cl-含量明显高于Na+,对Na+的相对吸收量多于Cl-。沙棘对盐胁迫有一定的适应能力,随NaCl浓度的升高,沙棘叶内脯氨酸含量升高,可溶性糖含量增加,渗透势降低,渗透调节能力增强。本结果可为盐碱地营造沙棘林提供依据。

<Abstrcat> Annual seedlings of \%Hippophae rhamnoides \%L. were treated with Hoagland solution added with 0, 100, 200 and 300 mmol/L NaCl, after 30 days, fresh weight, dry weight, water content, soluble sugar, Pro, organic ion content (Na\+\{+\}, Cl\+\{-\}), osmotic potential of leaves and osmotic adjustment ability were determined, respectively. The results showed that fresh weight and dry weight of above\|ground part and root of \%H. rhamnoides \%were the biggest under the treatment of 100 mmol/L NaCl, and which water content were also the biggest. When over 100 mmol/L of NaCl, fresh and dry weight of above\|ground part and root gradually decreased with salt concentration increasing and the decrease tendency of above\|ground part was more than root. With NaCl concentation increasing, content of Na\+\{+\} and Cl\+\{-\} in \%H. rhamnoides \%gradually increased. Cl\+\{-\} contents of stem and leaves and roots were obviously higher than Na\+\{+\} contents, and relative absorbed dose of Na\+\{+\} was more than Cl\+\{-\}. \%H. rhamnoides \%had certain adaptability to salt stress. With NaCl concentation increasing, Pro and soluble sugar contents increased, osmotic potential decreased, osmotic adjustment ability strengthened. These results provided basics for forestation of \%H. rhamnoides \%in soline\|alkali soil.