摘要
利用植物进行锰(Mn)污染治理之前,首先要探明胁迫对种子萌发及幼苗生长的影响。以锰超富集植物青葙(Celosia argentea)为试验材料,在不同锰浓度(0.005、1.000、5.000、8.000、12.000、15.000 mmol/L)下开展种子萌发试验,研究锰浓度与该植物种子萌发及幼苗生长的关系。结果表明,随着锰浓度的升高,青葙种子发芽率、发芽势、发芽指数及活力指数均呈现出先升高后降低的趋势,青葙幼苗的根长(r =-0.954,P=0.003)、芽长(r=-0.957,P=0.003)降低,幼苗总生物量(r=-0.941,P=0.005)也随之下降;幼苗总淀粉酶活性随着锰浓度的升高而呈下降趋势(r=-0.643,P=0.169),可溶性糖含量则呈先增加后下降的趋势。不同锰浓度下青葙总淀粉酶活性及可溶性糖含量的变化可能是导致该植物种子萌发及幼苗生长发生改变的主要原因。
Revealing the effects of heavy-metal stress on seed germination and seedling growth is the first step for effective controlling manganese （ Mn ） population by using these plants. In the present paper, we studied the relationship between Mn concentration and seed germination / and seedling growth of Celosia argentea by conducting seed germination experiments under different Mn concentrations （ 0.005, 1.000, 5.000, 8.000, 12.000 and 15.000 mmol/L ） . The results showed that seed germination rate, germination potential, germination index and vitality index all increased first and then decreased with Mn concentration increasing. The length of root （ r =-0.954, P =0.003 ） and shoot （ r =-0.957, P =0.003 ） of seedlings both decreased with Mn concentration rising when the Mn concentration ascended to a certain level. And the total biomass of seedling （ r =-0.941, P =0.005 ） showed the same trend. Total amylase activity of seedlings （ r =-0.643, P =0.169 ） decreased with the increase of Mn concentration. And the soluble sugar content increased firstly and then decreased with Mn concentration rising. The results illustrated that the changes of amylase activity and soluble sugar content of seedlings under different Mn concentrations might be the most important reasons that causing the changes of seed germination and seedling growth.
出处
《广东农业科学》
CAS
2017年第6期78-83,共6页
Guangdong Agricultural Sciences
基金
湖南省教育厅重点项目(14A156)
湖南省自然科学基金(2016JJ4120)
关键词
锰胁迫
青葙
种子萌发
幼苗生长
可溶性糖
manganese stress
Celosia argentea
seed germination
seedling growth
soluble sugar content
