盐胁迫对不同区域野生枸杞种子萌发的影响

Effects of salt stress on seed germination of wildLycium barbarum from different provenances

摘要:

为筛选出较耐盐碱的枸杞种源,用浓度为0、50、100、150、200、250、300 mmol/L的NaCl和NaHCO3对不同区域野生枸杞种子萌发进行胁迫处理,测定种子萌发指标。结果表明:两种盐胁迫下3个区域的枸杞种子起始发芽时间随盐浓度的升高而推迟,除相对盐害率呈上升趋势,种子发芽率、相对发芽率、发芽势、相对发芽势、发芽指数、相对发芽指数、活力指数及相对活力指数均呈下降趋势。两种盐对枸杞种子萌发均有抑制作用,且NaHCO3强于NaCl;3个种源野生枸杞种子的耐盐性强弱顺序为:定西＞兰州＞临夏。

Abstract:

This study aimed to select Lycium barbarum seeds with strong salt and alkali tolerance.The wild Lycium barbarum seeds from different provenance were treated with different concentrations of NaCl and NaHCO3,i.e.,0,50,100,150,200,250,300 mmol/L.In response to the increasing salt concentration under both NaCl and NaHCO3,the initial germination time of Lycium barbarum seeds with three different provenances became longer and .the relative salt damage rate increased gradually.The seed germination rate,the relative germination rate,the germination potential,the relative germination potential,the germination index,the relative germination index,vitality index and the relative vitality index reduced when salt concentration increased.Both NaCl and NaHCO3 inhibited the germination of Lycium barbarum seeds,with NaHCO3 having more severe effects than NaCl.The salt tolerance of wild Lycium barbarum seeds from the three provenances followed the order of Dingxi＞Lanzhou＞Linxia.