铅锌胁迫对蓖麻种子萌发与根系形态的影响  

Effects of Pb^(2+),Zn^(2+) stress on the seed germination and root morphology of Ricinus communis seedlings

作　　者：易诗明 蒋丽娟[1] 易心钰[1] 陈景震[2] 张路红[1] 

机构地区：[1]中南林业科技大学,湖南长沙410004 [2]湖南省林业科学院,湖南长沙410004

出　　处：《湖南林业科技》2017年第1期19-24,29,共7页Hunan Forestry Science & Technology

基　　金：十二五科技支撑项目"洞庭湖面源污染控制与湿地生态修复关键集成及示范"(2014BAC09B01);国家科技支撑项目"新型油料植物选育与栽培示范"(2015BAD15B02)

摘　　要：采用盆栽试验,研究了不同浓度Pb^(2+)、Zn^(2+)胁迫对蓖麻种子萌发与根系形态发育的影响。结果表明:单一和复合Pb^(2+)、Zn^(2+)胁迫对蓖麻的种子萌发和根系形态指标都产生了不同的影响。单一Pb^(2+)浓度≤400 mg/kg时能促进蓖麻种子萌发及根系和幼苗的生长;单一Pb^(2+)浓度为600 mg/kg时,根系生长受到明显的抑制作用,较对照组的主根长、根表面积分别下降了87.7%、47.7%;单一Zn^(2+)浓度≥400 mg/kg时,主根长、根表面积比单一Pb^(2+)胁迫下降更明显,且抑制作用随着Zn^(2+)浓度的增加而增加。复合胁迫基质中,Zn^(2+)对植物根系发育与生长的抑制作用大于Pb^(2+),但Pb^(2+)能在一定程度上缓解高浓度Zn^(2+)对植物的抑制作用。In this paper, Ricinus communis was planted in potting soil mixed with different concentrations of Pb^2＋ and Zn^2＋, so as to investigate the response of the root morphology development and growth characteristics under Pb^2＋,Zn^2＋stress condition. The results showed that indexes of root system varied with different treatment of single Pb^2＋, Zn^2＋ and compound Pb^2＋ and Zn^2＋. When the concentration of single Pb^2＋ was below 400 mg/kg, castor seed germination, roots development and growth, young plant growth were promoted. When the Pb^2＋ concentration was 600 mg/kg, roots development and growth were obviously inhibited, in which root length and root surface area were decreased by 87.1% and 47.7% respectively compared to control. When the single Zn^2＋ concentration was more than 400 mg/kg, its taproot length and surface area decreased more significantly than single Pb^2＋ stress, and the inhibition of roots development and growth would be more serious with the increase of the Zn^2＋ eoncentration. Under the eombined Pb^2＋ and stress,Zn^2＋ contributed more inhibition on the growth and development of roots than that of Pb^2＋. Pb^2＋ could ease the inhibition of high concentration of Zn^2＋ on the plants to a certain extent.

关 键 词：蓖麻 铅锌胁迫 根系形态 根系生长 

分 类 号：S565.6[农业科学—作物学]