| Physiological effects of different Cd concentrations on maize root architecture and classification北大核心CSCD |
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| 引用本文： | 魏畅,焦秋娟,柳海涛,张静静,申凤敏,姜瑛,张雪海,孙娈姿,杨芳,刘振.Physiological effects of different Cd concentrations on maize root architecture and classification北大核心CSCD[J].草业学报,2022,31(3):101-113. |
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| 作者姓名： | 魏畅 焦秋娟 柳海涛 张静静 申凤敏 姜瑛 张雪海 孙娈姿 杨芳 刘振 |
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| 作者单位： | 1.河南农业大学资源与环境学院，河南 郑州 450002;2.河南农业大学农学院，省部共建小麦玉米作物学国家重点实验室，河南 郑州 450002;3.西北农林科技大学草业与草原学院，陕西 咸阳 712100;4.吉林农业大学资源与环境学院，吉林 长春 130118;5.山东省黄河三角洲生态环境重点实验室，滨州学院，山东 滨州 256603 |
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| 基金项目： | 河南省留学人员科研择优资助项目;河南农业大学青年英才专项基金项目;山东农业大学作物生物学国家重点实验室开放课题项目;国家重点研发计划;国家自然科学基金 |
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| 摘 要： | In this research, a hydroponics experiment was conducted to apply different concentrations of cadmium (Cd) (0, 5, 10, 25, 50, 100, 200 μmol·L-1) to maize seedlings with two leaves and one new leaf, in order to explore the effects of the different Cd concentrations on the maize seedling growth, Cd absorption kinetics and root morphology and classification. After 5 days of Cd stress, the maize seedings were sampled, the plant height, main root length, aboveground and underground biomass, root architecture, Cd content and photosynthesis and related parameters were measured. It was found that with increasing Cd stress, the plant height, main root length, biomass and tolerance index of shoots and roots, total root length, root surface area, root volume, root forks and root tips all decreased significantly; Root average diameter and root:shoot increased significantly (P<0.05). Meanwhile root parameters (root length, root surface area and root volume) of root diameter classes designated Ⅰ-Ⅲ (0-1.5 mm) showed a decreasing trend, which had a significant (P<0.05) negative correlation with root Cd concentration. The proportion of root length, root surface area and root volume with diameter between 0-0.5 mm showed a downward trend under Cd stress. Under Cd stress, Cd concentration and accumulation in underground and aboveground parts of maize seedlings increased significantly, chlorophyll content decreased, and photosynthesis was inhibited. This study has shown that Cd affected root development mainly by inhibiting the growth and morphology of fine roots, and inhibited photosynthesis, elongation and biomass accumulation of the aboveground and underground parts of the maize seedings. © 2022, Editorial Office of Acta Prataculturae Sinica. All rights reserved.
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| 关 键 词： | 玉米 镉暴露 根系构型 根系分级 |
| 收稿时间： | 2021-07-27 |
| 修稿时间： | 2021-10-08 |
Physiological effects of different Cd concentrations on maize root architecture and classification |
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| WEI Chang,JIAO Qiu-juan,LIU Hai-tao,ZHANG Jing-jing,SHEN Feng-min,JIANG Ying,ZHANG Xue-hai,SUN Luan-zi,YANG Fang,LIU Zhen.Physiological effects of different Cd concentrations on maize root architecture and classification[J].Acta Prataculturae Sinica,2022,31(3):101-113. |
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| Authors: | WEI Chang JIAO Qiu-juan LIU Hai-tao ZHANG Jing-jing SHEN Feng-min JIANG Ying ZHANG Xue-hai SUN Luan-zi YANG Fang LIU Zhen |
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| Abstract: | In this research， a hydroponics experiment was conducted to apply different concentrations of cadmium （Cd） （0， 5， 10， 25， 50， 100， 200 μmol·L-1） to maize seedlings with two leaves and one new leaf， in order to explore the effects of the different Cd concentrations on the maize seedling growth， Cd absorption kinetics and root morphology and classification. After 5 days of Cd stress， the maize seedings were sampled， the plant height， main root length， aboveground and underground biomass， root architecture， Cd content and photosynthesis and related parameters were measured. It was found that with increasing Cd stress， the plant height， main root length， biomass and tolerance index of shoots and roots， total root length， root surface area， root volume， root forks and root tips all decreased significantly； Root average diameter and root∶shoot increased significantly （P<0.05）. Meanwhile root parameters （root length， root surface area and root volume） of root diameter classes designated Ⅰ-Ⅲ （0-1.5 mm） showed a decreasing trend， which had a significant （P<0.05） negative correlation with root Cd concentration. The proportion of root length， root surface area and root volume with diameter between 0-0.5 mm showed a downward trend under Cd stress. Under Cd stress， Cd concentration and accumulation in underground and aboveground parts of maize seedlings increased significantly， chlorophyll content decreased， and photosynthesis was inhibited. This study has shown that Cd affected root development mainly by inhibiting the growth and morphology of fine roots， and inhibited photosynthesis， elongation and biomass accumulation of the aboveground and underground parts of the maize seedings. |
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| Keywords: | maize Cd exposure root architecture root classification |
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