文献类型：期刊文献

中文题名：Pb^(2+)胁迫对冬凌草种子萌发和幼苗生长的影响

英文题名：Effects of Pb^(2+) stress on seed germination & seedling growth of Rabdosia rubescens

作者：孔四新[1,2] 苏贺[1] 詹延廷[1] 李海奎[3] 崔旭盛[1] 郭玉海[1]

第一作者：孔四新

机构：[1]中国农业大学农学与生物技术学院;[2]世纪神农(北京)国际生物技术公司;[3]中国林业科学研究院资源信息研究所

年份：2014

卷号：39

期号：21

起止页码：4216-4221

中文期刊名：中国中药杂志

外文期刊名：China Journal of Chinese Materia Medica

收录：MEDLINE(收录号：25775796);CSTPCD;;Scopus;北大核心:【北大核心2011】；CSCD:【CSCD2013_2014】；PubMed;

语种：中文

中文关键词：重金属;Pb胁迫;冬凌草;种子萌发;Pb生物富集

外文关键词：heavy metal; Pb stress; Rabdosia rubescens; seed germination; Pb bioaccumulation

分类号：R978.1

摘要：以冬凌草种子为材料,研究铅(Pb2+)溶液(0,135,270,540,1 080 mg·L-1)对冬凌草种子萌发和幼苗生长的影响。结果表明:1低浓度Pb对冬凌草种子萌发无显著影响,Pb质量浓度135 mg·L-1条件下的种子发芽势高于对照,发芽速度快于对照,但差异均不显著;中高质量浓度Pb(270~1 080 mg·L-1)对种子萌发有显著的抑制效应,随着Pb浓度的升高,种子发芽率、发芽势和发芽指数呈递减趋势,均显著低于对照(P<0.05),发芽率比对照低23.97%~55.37%。2低质量浓度Pb(135 mg·L-1)条件下,冬凌草幼苗生长活力指数低于对照,但差异不显著;中高质量浓度Pb(270~1 080 mg·L-1)对幼苗生长有显著抑制效应(P<0.05),胚根长、胚芽长、生物量、生长活力指数均显著低于对照;胚芽和胚根生长受Pb胁迫,其中胚根生长受抑制程度大于胚芽,胚根长比对照低43.09%~100%。3冬凌草Pb富集系数为0.76~2.59,随Pb浓度增高而增大;Pb生物富集是抑制幼苗生长的主要原因。4经拟合模型预测分析,比对照发芽率和生物量鲜重降低10%的Pb临界质量浓度分别为195.18,101.65 mg·L-1。
The seeds of Rabdosia rubescens were as the materials to research the impacts of different lead （ Pb^2＋ ） concentrations（0, 135, 270,540, 1 080 mg· L^-1 ） on seed germination and seedling growth. The results show that： Low concentration of lead had no obvious effect on early germination of the seed, the germination vigor and germination speed were lightly higher but not significantly differed at the level of Pb concentration 135 mg ~ L-l with control group; Mid-high concentration of Pb solution（270-1 080 mg· L^-1） significantly inhibited the seed germination and seedling growth, which reduced the seed germination rate, germination vigor, germination index, embryo root length and shoot length, growth index with increasing of Pb concentrations. There was a inhibitory effect on embryo shoot length and root length at mid-high lead concentrations stress, and stronger inhibitory effect on root , which was more sensitive than shoot to Pb stress（P 〈 0.05 ）. Pb bioaccumulation coefficient （BC） was 0.76-2. 59, increased with concentration of Pb ; Pb enrichment in seedling mainly caused the growth inhibition. The fitting model predictive analyses show, the critical concentration of Pb, which causes the germination rate and biomass fresh weight reducing 10%, is 195.18,101.65 mg ·L^-1.