酸铝胁迫对狼尾草种子萌发和幼苗恢复生长的影响  

Effect of Acid-aluminum Stress on Seed Germination and Seedling Growth Recovery Ability of Pennisetum alopecuroides

作　　者：胡锦勤 李靖[1] 尚丹[1] 文昭竹 毕金鹏[1] 张志飞[1,2] 

机构地区：[1]湖南农业大学农学院,长沙410128 [2]湖南农业大学草业科学研究所,长沙410128

出　　处：《种子》2015年第12期21-25,共5页Seed

基　　金：农业部畜牧总站"湖南牧草种质资源保护"项目;长沙市科技计划项目(编号:K 1308033-21);湖南农业大学2013年大学生创新性实验计划项目(编号:XCX 13077)

摘　　要：为探究酸铝胁迫对狼尾草种子萌发的影响以及幼苗在胁迫解除后,Al 3+胁迫浓度对幼苗恢复生长能力的影响,采用滤纸发芽法,在发芽期间对狼尾草种子进行胁迫处理(Al 3+浓度分别为50,100,200,1 000,2 000,10 000,20 000μmol/L,pH=4.5),9d后解除胁迫,恢复生长。结果表明:Al 3+胁迫浓度对狼尾草发芽率没有影响,但高浓度的Al 3+会降低发芽势,且显著抑制根系生长。狼尾草对高浓度铝毒危害的恢复能力较快,前5d是狼尾草排毒、根系迅速恢复生长的关键时期。可见狼尾草对铝的耐受能力和解除铝毒害的能力极强,其铝代谢途径有待深入研究。Effect of acid-aluminum stress on seed germination, seedling growth recovery ability of Pennisetum alopecuroides were determined by incubating seed with different concentration （50,100, 200,1 000,2 000,10 000,20 000/μ mol/L, pH = 4.5） of AP＋.The acid and aluminum stress was relieved after 9 d,and then seedling restored growth. AP＋ stress with different concentration had no effect on germination rate of Pennisetum,but the high concentration of AP＋ reduced the germination potential of Pennisetum.Seedling growth recovery ability of Pennisetum was strong, The first 5 d was the key period of root restore growth of Pennisetum.The results suggested Pennisetum have strong tolerance ability to A1a＋ and the ability of removing AP＋ toxicity, and the metabolic pathways of AP＋ in Pennisetum should be deeply explored and studied.

关 键 词：狼尾草 幼苗 酸铝胁迫 恢复生长 

分 类 号：S688.4[农业科学—观赏园艺]