Abstract:

The Ceratoides latens is xerophytic subshrub with the ability of drought resistance, salt resistance and barren resistance. It is a good forage in the arid region. In order to reveal seed germination behavior and ecological adaptation mechanisms, experiments were conducted to determine the effects of temperature, bracts, storage time and NaCl on seed germination. The results showed that: seed germination was fast and high in 20/30℃ and 25/35℃(d/l), while it was slow and extended in 5/15℃ and 10/20℃(d/l). In 10 months dry storage, the germination rate became faster with increasing time. Bracts had significant influence on the final germination rate of seed. The removal of bracts obviously promoted the seed germination. Germination was not affected by NaCl at concentrations below 0.6 mol·L^-1, but decreased with increasing NaCl concentration to higher level. The germination rate of seeds incubated in NaCl was less than 30%. It showed that its various germination strategies ensure successful survival in salt desert.

Key words: Ceratoides latens, Temperature, NaCl stress, Bracts, Germination

摘要：

驼绒藜(Ceratoides latens)是一种抗旱、耐盐、耐瘠薄的温带旱生半灌木,为旱生优良牧草。通过研究温度、贮藏时间、苞片及盐分对驼绒藜种子萌发的影响,旨在揭示其萌发行为及其适应机制。结果表明:驼绒藜种子在高温周期(25/35℃和20/30℃)萌发速度快、萌发率高;低温周期(5/15℃和10/20℃)的种子则成持续性萌发。驼绒藜种子具有后熟作用,种子在室温下干藏10个月仍具高的萌发率。苞片影响种子的最终萌发率,去除苞片可以明显促进种子的萌发。浓度低于0.6 mol·L^-1的NaCl溶液对种子的萌发率无显著影响;但从0.6 mol·L^-1起随着浓度增高,萌发率逐渐降低,直至为零;盐处理后,大部分种子失去活力。

关键词: 驼绒藜, 温度, NaCl胁迫, 苞片, 种子萌发