Acta Agrestia Sinica

Acta Agrestia Sinica ›› 2017, Vol. 25 ›› Issue (5): 1007-1013.DOI: 10.11733/j.issn.1007-0435.2017.05.014

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Effect of Exogenous Silicon on Silicon Uptake and Root Growth of Kentucky Bluegrass

XU Jin-feng1,2, ZHU Jin1, REN Yun-fei1, JIA Qi-chao3, XIE Yu-han1, CHAI Qi1   

  1. 1. Lanzhou University, College of Pastoral Agricultural Science and Technology, Lanzhou, Gansu Province 730020, China;
    2. Urumqi High-teach Industrial Develoment Zone Environmental Protection Agency, Urumqi, Xinjiang 830000, China;
    3. Xinjiang Qingfenglangyue Environmental Protection Technology Co. Ltd., Urumqi, Xinjiang 830000, China
  • Received:2016-12-19 Revised:2017-06-02 Online:2017-10-15 Published:2018-01-25

外源硅添加对草地早熟禾硅素吸收及根系生长的影响

许金凤1,2, 朱瑾1, 任畇霏1, 贾启超3, 谢宇涵1, 柴琦1   

  1. 1. 兰州大学草地农业科技学院, 甘肃 兰州 730020;
    2. 乌鲁木齐高新技术开发区(新市区)环保局 新疆 乌鲁木齐 830000;
    3. 新疆清风朗月环保科技有限公司, 新疆 乌鲁木齐 830000
  • 通讯作者: 柴琦,E-mail:chaiqi@lzu.edu.cn
  • 作者简介:许金凤(1991-),女,山东菏泽人,硕士研究生,主要从事草坪逆境生理研究,E-mail:995122770@qq.com
  • 基金资助:

    兰州大学“中央高校基本科研业务费专项资金”创新人才培养-优秀研究生创新项目（lzujbky-2017-it15）资助

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Abstract:

A hydroponic experiment with the Kentucky bluegrass (Poa pratensis L.) cultivar ‘midnight’ as the test material was conducted to investigate the effects of the different levels of silicon on several physiological parameters, including silicon uptake efficiency, root-shoot ratio, leaf relative electrical conductivity and root growth and development. The results showed that with the increase of silicon supply, the silicon uptake efficiency increased significantly. Compared with control, the root shoot ratio had no significant difference under the low concentration of silicon. On the contrary, the root shoot ratio was significantly different under the high concentration of silicon. With the increase of silicon supply, the leaf relative conductivity first dropped and then rose. When the concentration of silicon was 0.5 mmol·L-1, leaf relative conductivity reached the minimum. With the increase of silicon supply, the root length and root surface area gradually increased, and the root diameter first rose and then dropped. When the concentration of silicon was 0.5 mmol·L-1, it reached the maximum. When the silicon concentration was 1.0 mmol·L-1, it decreased significantly. The root numbers had a little change under the low concentration of silicon. When the silicon concentration was 0.5 mmol·L-1, it increased significantly. Therefore, suitable silicon supply was more conducive to the silicon uptake and the root growth of Kentucky bluegrass.

Key words: Silicon, Kentucky bluegrass, Uptake efficiency, Root

摘要：

采用溶液培养法，以草地早熟禾（Poa pratensis L.）品种‘午夜’为试验材料，研究了不同硅素水平对草地早熟禾硅素吸收、叶片相对电导率、根冠比和根系生长发育的影响。结果表明：随着硅素浓度的增加，硅素吸收速率显著增加；低浓度硅素处理并未对根冠比产生显著影响，高浓度硅素处理显著增加了根冠比；叶片相对电导率随着硅素水平的增加而呈现先降低后增加的趋势。当硅素浓度达到0.5 mmol·L-1时，叶片相对电导率最低；随着硅素浓度的增加，草地早熟禾根系总表面积和总长逐渐增加；根系直径随着硅素水平的增加而呈现先增加后降低的趋势，硅素浓度为0.5 mmol·L-1时，根系直径最大，当硅素浓度达到1.0 mmol·L-1时，根系直径显著降低；在低浓度硅素处理下，根条数变化不大，当硅素浓度达到0.5 mmol·L-1时，根条数显著增加。可见，适宜浓度的硅素处理有利于草地早熟禾硅素的吸收和根系生长。

关键词: 硅, 草地早熟禾, 吸收速率, 根系

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