铅胁迫对补血草种子萌发和幼苗初期生长及膜透性的影响

Effects of Lead on the Germination and Growth of Limonium sinense

研究了不同浓度铅胁迫下补血草种子萌发及幼苗的膜透性,结果表明:铅胁迫对补血草的种子萌发具有低浓度下的激活效应和高浓度下的抑制效应;对幼苗苗长具有胁迫初期低浓度下的激活效应,随着胁迫时间的延长,转而表现为抑制效应,对幼苗根长具有显著的抑制效应.幼苗的生长状况比种子萌发更能体现铅毒性的大小.而根长的变化可作为植物受重金属毒性影响的一个重要指标.幼苗的膜透性的影响是随着铅浓度的增加,膜的通透性增加,选择通透的能力下降.

Studies under the different density lead coercion to make up the bloodroot seed germination and seedling＇s membrane penetrability. The result indicated that, When lead coercion makes up the bloodroot the seed germination to have under under the low concentration activation effect and the highly concentrated inhibitory action; Seedling＇s growth condition sprouts compared to the seed can manifest the lead poisoning slightly greatly, the germination initial period germ, each density obvious difference, has not lengthened along with the time, the density achieves 400mMol/Until L above performance poison symptom, germ gradually Chrysanthemum, brown part rotten death. But the root long change may take the plant a heavy metal toxicity influence important target. Seedling＇s membrane penetrable influence is along with the lead density increase, the membrane oermeability increase, chooses the insightful ability drop.