| Pb、Cu胁迫对玉米(Zea mays L.)生长、细胞色素合成以及重金属吸收特性的影响 |
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| 引用本文： | 陆干,李磊明,陶祥运,刘小红,司友斌.Pb、Cu胁迫对玉米(Zea mays L.)生长、细胞色素合成以及重金属吸收特性的影响[J].安徽农业大学学报,2017,44(5):905-911. |
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| 作者姓名： | 陆干 李磊明 陶祥运 刘小红 司友斌 |
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| 作者单位： | 安徽农业大学资源与环境学院,合肥,230036;安徽农业大学资源与环境学院,合肥,230036;安徽农业大学资源与环境学院,合肥,230036;安徽农业大学资源与环境学院,合肥,230036;安徽农业大学资源与环境学院,合肥,230036 |
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| 基金项目： | 国家科技支撑计划课题（2015BAD05B04）和国家重点研发计划课题（2017YFD0801102）共同资助。 |
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| 摘 要： | 通过水培试验,以玉米作为供试植株,研究Pb、Cu胁迫对玉米生长发育、细胞色素合成以及重金属吸收的影响。结果表明,Pb、Cu单一胁迫下玉米根长较对照组均偏低,复合胁迫下根长随着Pb、Cu复合浓度的增加而减小。玉米植株在重金属Pb、Cu单一胁迫下生物量变化不明显,但在不同水平Pb、Cu复合胁迫下,表现随着重金属胁迫浓度增加,玉米植株生物量先增加后减小。玉米叶绿素含量随着Pb胁迫浓度增加而增加、随着Cu浓度增加而降低;Pb、Cu单一胁迫下β-类胡萝卜素含量随着Pb浓度增加先降低后增加,随着Cu含量增加先增加后降低;Pb、Cu单一胁迫下花青素含量较对照组均增大,Cu胁迫下花青素含量增加更明显,最低增加0.65%,最高增加21.25%。玉米不同器官对Pb、Cu积累有一定差异,在单一重金属胁迫下Pb、Cu在玉米体内积累量与胁迫浓度呈正相关,分布顺序为根系茎叶,根部是积累Pb、Cu主要器官。Pb、Cu复合胁迫下加剧了重金属向玉米体内的迁移累积,随着Pb、Cu复合胁迫浓度的增大,根部吸收Pb、Cu逐步增大,而茎叶吸收Pb、Cu趋于平稳。相关分析显示,玉米细胞色素的合成取决于被胁迫的重金属类型,β-类胡萝卜素含量与植株体内Pb含量显著正相关,花青素含量与Cu含量显著正相关,揭示Pb对β-类胡萝卜素诱导作用强、Cu对花青素诱导作用强。
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| 关 键 词： | 重金属 玉米 细胞色素 吸收特性 |
| 收稿时间： | 2017/3/13 0:00:00 |
Effects of lead and copper stress on growth |
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| LU Gan,LI Leiming,TAO Xiangyun,LIU Xiaohong and SI Youbin.Effects of lead and copper stress on growth[J].Journal of Anhui Agricultural University,2017,44(5):905-911. |
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| Authors: | LU Gan LI Leiming TAO Xiangyun LIU Xiaohong and SI Youbin |
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| Institution: | School of Resources and Environment, Anhui Agricultural University, Hefei 230036,School of Resources and Environment, Anhui Agricultural University, Hefei 230036,School of Resources and Environment, Anhui Agricultural University, Hefei 230036,School of Resources and Environment, Anhui Agricultural University, Hefei 230036 and School of Resources and Environment, Anhui Agricultural University, Hefei 230036 |
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| Abstract: | The influencing mechanism of Pb and Cu stress to the growth,synthesis of cytochrome and adsorp tion of heavy metal of corn was investigated using a hydroponics experiment.The results showed that single stress of Pb or Cu led to a relatively low root length of the corn,while Pb and Cu combined stress demonstrated a negative correlation between the root length and the compound concentration.The biomass of com samples remained rela tively stable in single stress experiment of Pb or Cu and it just increased firstly and then decreased with the increas ing Pb or Cu concentration.The content of chlorophyll presented a negative correlation with Cu concentration,and a positive correlation with Pb concentration.The content of β-carotenoids in the single stress experiment increased firstly and then decreased with the increase of Cu concentration.The β-carotene decreased firstly and then increased with the increase of Pb concentration.The content of anthocyanin increased relatively in the single stress treatment of Pb or Cu,but the increased extent caused by Cu stress was more significant,with the lowest increase of 0.65％ and the highest increase of 21.25％.The adsorption abilities of different corn organs to heavy metal Pb and Cu exhibited some differences.The accumulation of heavy metals in com (root ＞ stem and leaf) kept a positive correlation with the treatment concentration.The absorption abilities of roots gradually increased with the increase of heavy metal Pb and Cu combined stress,while the absorption abilities of stems and leaves remained relatively stable,which indicated that the abilities of corn plant to migrate and accumulate heavy metal were stimulated by Pb and Cu combined stress.The correlation analysis between cytochrome synthesis and heavy metal indicated that the synthesis of corn cytochrome depend on the metal type.There was significant correlation between Pb content and β-carotenoid content,while Cu content was significantly correlated with anthocyanin content.The results revealed that Pb exerted more effects in inducing β-carotenoids,while Cu made much more important roles in inducing anthocyanins.All of these would provide a scientific basis for plant heavy metal toxicity and resistance mechanism. |
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| Keywords: | heavy metal corn (Zea mays L ) cytochrome absorption characteristics |
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