【摘要】 植物在离开生长环境较短时间内(1~6 h)会导致缓慢的表面水分散失,引起自然的干旱胁迫。本文以耐旱植物长春花(Catharanthus roseus)为材料,研究其在离土干旱胁迫中的脱落酸(ABA)及可溶性糖含量变化。结果表明,长春花根部ABA含量在正常条件下低于叶片中的含量,干旱胁迫促进了ABA在根部的积累,6 h时增加至最高值。蔗糖酸性转化酶活性可能受到ABA的诱导在胁迫6 h时最高,比对照高出30%左右。长春花叶片中总可溶性糖含量在对照条件下非常稳定,但在干旱胁迫过程中,其随着时间的延长呈现线性增加的趋势(r2=0.964),蔗糖和已糖含量在胁迫过程中也呈增加的趋势,可能发挥着渗透调控节功能。更多还原

【Abstract】 Slow rate of water loss(RWL) in leaf surface is induced by removal of plants from soil,leading to drought stress to some extent.In the present paper,Catharanthus roseus with strong desiccation tolerance was conducted to investigate the dynamics of ABA and soluble sugar contents in leaves and roots.The ABA content in roots of seedlings was lower than that in leaves in control condition,while dehydration treatment promoted its accumulation in roots,arriving at the peak value at 6h.The activity of acid invertase(AI) may be activated by elevated ABA and increased by 30% after 6h treatment.Total soluble sugar content in control leaves was observed to be very stable,but when exerted in stress,they appeared to increase linear with prolong of stress time(r2=0.964).At the same time,sucrose and hexose also exhibited the trend of enhancement due to drought stress,to play a role of osmotic adjustment.更多还原