NaCl胁迫对白桦种子萌发和幼苗生长的影响

Effects of NaCl Stress on Seeds Germinnation and Seedlings Growth of Betula platyphylla

本文对盐胁迫下白桦种子萌发和幼苗生长进行了分析。结果表明,当NaCl浓度低于0.1%时,种子发芽率、发芽势、发芽指数、胚根长、胚芽长、叶长和叶宽均与对照差异不大;而当浓度达到0.2%时,白桦种子的萌发和幼苗生长受到显著影响,并且随着NaCl浓度的增加,种子萌发和幼苗生长各项指标均呈明显下降的趋势。因此,白桦种子萌发的耐盐阈值为0.1%。

The seeds germination and seedlings growth of Betula platyphylla under salinity were analysed.The results showed that the seeds germination、germination potential、germination index、length of radicle、length of embryo、length and width of leaf had insignificantly control under 0.1% NaCl;As the NaCl concentration were more than 0.2%,the seeds germination and seedlings growth of Betula platyphylla were seriously effected,with the increasing of NaCl concentration,the indicate of seeds germinnation an seedlings growth were seriously significantly decreased respectively.As a rsults,the salt tolerance thresholds of seeds germinnation of Betula platyphylla was 0.1%.