盐胁迫对两种源苦楝种子萌发特性的影响

Effects of NaCl stress on germination characteristics of Melia azedarach L.seeds from two provenances

为研究盐胁迫下苦楝种子萌发特性并比较种源间差异,用不同浓度(0、50、100、150、200 mmol/L)NaCl溶液处理两种源地(江苏滨海及安徽滁州)苦楝种子,比较种子发芽率、发芽指数、活力指数及幼苗生长的变化。结果表明:随盐处理浓度升高,两种源地苦楝种子发芽率、发芽指数和活力指数总体均呈各自不同的下降模式,且种子活力的下降先于发芽率的下降。胚根和胚轴生长在盐胁迫环境中受到不同程度的抑制,盐浓度对幼根的影响较小。总体来说,滨海苦楝种子在萌发时的耐盐性优于滁州种子。

The germination characteristics of Melia azedarach L. seeds from Binhai of Jiangsu province and Chuzhou of Anhui province were studied and compared at various salinity regimes（ 0,50,100,150,200 mmol /L NaCl）. Germination rate,germination index,vigor index,length of hypocotyl and radicle were determined. The results showed that germination percentage of Melia azedarach L. seeds were subjected to inhibition at all degrees. The germination index and vigor index decreased with the increase of salt stress,but different decrease patterns were observed for these two subjects.Seeds vigor was inhibited earlier than germinability under the saline conditions. The growth of hypocotyl and radicle had different responses to salinities,and the salt concentrations had less influence on the radicle. Binhai seeds showed better salt tolerance than Chuzhou seeds,while the germination rate,germination index,vigor index and seedling length of Melia azedarach L. seeds from Binhai were better than those from Chuzhou along under the same NaCl concentration.