摘要
比较研究了等渗(-0.096,-0.198,-0.437MPa)的NaCl、Cl盐和Na盐处理10d对籽粒苋幼苗干重、生长速率、叶绿素含量、光合作用特性及离子吸收分布的影响。结果表明,-0.096和-0.198MPaCl盐显著促进植株干重,-0.198和-0.437MPa盐胁迫下,对籽粒苋幼苗生长抑制幅度由大到小依次为Na盐>NaCl>Cl盐处理。高盐(-0.437MPa)胁迫下,对籽粒苋幼苗净光合速率(Pn)、蒸腾速率(Tr)和气孔导度(Gs)的抑制幅度由大到小次序为Na盐>NaCl>Cl盐处理。NaCl和Na盐胁迫下,籽粒苋幼苗植株根和茎中Na+含量均高于叶中Na+含量,将Na+更多的截留在根、茎中。不同渗透势下的NaCl、Na盐处理均显著提高根、茎、叶的SK,Na,根的SK,Na随着盐度的增加呈增加趋势。结果表明,NaCl对籽粒苋幼苗的钠胁迫作用显著大于氯胁迫的,NaCl和Na盐胁迫下植株根、茎、叶对K+的选择性吸收和运输均显著增强,赋予籽粒苋幼苗对盐的一定程度上的适应性。
Ion-specific stresses of Cl-and Na＋on biomass,growth rate,chlorophyll contents,photosynthesis traits,and ion contents of grain amaranth seedlings were studied and compared under iso-osmotic（-0.096 MPa,-0.198MPa,-0.437MPa）salt solutions（NaCl,Cl-salt,and Na-salt）for 10din sand culture in a greenhouse.Both-0.096 and-0.198MPa Cl-salt increased the dry weight of grain amaranth seedlings com- pared with the control whereas-0.437MPa NaCl,Na-salt and Cl-salt both significantly reduced plant dry weight.The order of growth inhibition under different treatments with high pressure conditions（-0.437 MPa）was Na-salt〉 NaCl〉Cl-salt.Net photosynthetic rate（Pn）,transpiration rate（Tr）and stomatal conductance（Gs）of grain amaranth seedlings in descending order of magnitude suppression was Na-salt〉NaCl 〉Cl-salt treatment.The Na＋contents in the leaf were lower those of the stem and root under NaCl and Na-salt stress.Ion selectivity of imbibition or transportation（SK,Na）in roots,stems,and leaves were all increased under-0.096,-0.198,-0.437MPa NaCl and Na-salt treatments.In general,growth inhibition of grain amaranth seedlings from Na-salt stress was much more than that from Cl-salt stress.Salt adaptation of grain amaranth seedlings to a certain degree to Na＋ was due to high K＋selective absorption and transport.
出处
《草业学报》
CSCD
北大核心
2010年第5期63-70,共8页
Acta Prataculturae Sinica
基金
国家海洋863项目(2007AA091702)资助
关键词
籽粒苋
幼苗
等渗条件
盐胁迫
生长
光合作用
离子平衡
grain amaranth（Amaranthus hypochondriacus）
seedlings
iso-osmotic stress
salt stress
photosynthesis
ion homeostasis
