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垂序商陆繁殖期各器官锰富集规律及其对种子萌发的影响 被引量:3

Manganese Enrichment in Organs of Phytolacca americana at Reproductive Period and Its Effects on Seed Germination
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摘要 通过室内盆栽实验,以锰超累积植物垂序商陆植株为材料,比较了不同供锰水平(0.005、0.1、1.0mmol/L)下种子成熟过程中各器官锰含量的动态变化及所产种子的萌发率,旨在了解高锰条件下垂序商陆在繁殖期体内锰富集规律及其对繁殖能力的影响。结果发现:(1)在垂序商陆种子成熟过程中,各处理组植株的根、茎、叶、果实中锰含量均随时间推移呈逐渐增加趋势,且植物器官中锰含量随环境中锰浓度升高而提高;种子内的锰含量变化规律在对照组和处理组之间不同,对照组(0.005mmol/L)先小幅下降后持续增加,而处理组(0.1与1.0mmol/L)则先持续增加,至末期出现不同程度的降低。(2)相同锰浓度环境条件下,种子成熟后期各器官锰含量均表现为种子<茎<根<果实(包括种子)<叶。(3)GC-MS分析表明果汁中有机酸主要成分为草酸与少量的2-羟基丙酸,有机酸的成分与含量在各组间无明显不同。(4)随锰浓度增加,种子中锰含量增加,而萌发率则逐渐降低,且各组间差异极显著。研究结果提示,垂序商陆植株各器官内锰积累量与环境中锰浓度密切相关,其在种子成熟过程中会对体内多余的锰在各器官进行合理分配,以减小锰富集带来的有害效应从而完成自身生命周期,并可能在种子成熟末期采取降低种子中锰的分配量来提高萌发率从而保证高繁殖能力,果浆的可溶性水环境及所含有机酸在繁殖期植株解锰毒中发挥了重要作用。 In the present paper,the dynamic change rule of manganese content in different organs during seed maturation process and corresponding seed germination rate of Phytolacca americana were compared under different manganese concentrations(0.005,0.1,1.0mmol/L)in order to understand the manganese enrichment regularity and its effect on reproductive capacity of the manganese hyperaccumulator in breeding period.Results showed that,during seed maturation process,(1)Manganese content in roots,stems,leaves and fruits all increased gradually in each group,and the higher the manganese concentration in nutrient solution,the more manganese content in all organs.Manganese content in seed changed differently between control and treating groups,it declined slightly firstly then kept increasing in control group(0.005mmol/L)while increased firstly then decreased in final stage in treating groups(0.1and 1.0mmol/L).(2)Manganese content order in different organs was seedrootstem fruitleaf in each group at final stage.(3)The organic acids in fruit juice were oxalic acid and 2-hydroxy propionic acid,and the former wasthe dominant component;there was no significant change in component and content of the organic acids with the increasing of manganese concentration in nutrient solution.(4)Germination rate declined with the increasing of manganese content in seeds,and there was a significant difference existed in germination rate among different groups(P0.01).Results indicate that,Phytolacca americana will distribute the surplus manganese in organs reasonably to reduce the harmful effects caused by manganese enrichment and complete its life cycle successfully.It might improve the germination rate by reducing the manganese amount in seeds at the final stage of seed maturation process to ensure a high reproductive capacity and the soluble water environment and these organic acids in fruit juice may play an important role in manganese toxicity resistance.
出处 《西北植物学报》 CAS CSCD 北大核心 2015年第10期2062-2068,共7页 Acta Botanica Boreali-Occidentalia Sinica
基金 湖南省科技厅科研项目(2013NK4112 2014NK3133) 湖南科技学院校级科研项目(14XKY109) 2014年湖南科技学院大学生研究性学习课题
关键词 垂序商陆 锰胁迫 繁殖期 锰富集 种子萌发率 Phytolacca americana manganese stress reproductive period manganese enrichment seed germination
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