| 典型湿地植物在盐碱胁迫下的催芽方法研究 |
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| 引用本文： | 孙慧,程锐,程宪伟,阎百兴,祝惠.典型湿地植物在盐碱胁迫下的催芽方法研究[J].农业现代化研究,2021,42(2):367-375. |
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| 作者姓名： | 孙慧 程锐 程宪伟 阎百兴 祝惠 |
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| 作者单位： | 中国科学院东北地理与农业生态研究所,中国科学院东北地理与农业生态研究所,中国科学院大学,中国科学院东北地理与农业生态研究所,中国科学院东北地理与农业生态研究所 |
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| 基金项目： | 国家重点研发计划项目（2016YFC0504404-4）；中国科学院青年创新促进会项目（2017274） |
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| 摘 要： | 种子萌发和幼苗生长是植物生长繁殖的关键阶段,但经常受到盐碱胁迫的影响。本研究通过光照培养箱和土培试验,探讨了5种催芽方法在盐碱胁迫条件下,对两种典型湿地植物香菇草(Hydrocotyle vulgaris)、梭鱼草(Pontederia cordata)的催芽效果及幼苗生长的影响。结果表明:在盐碱胁迫环境下,机械法和乙烯利法更适合香菇草种子的发芽,热水浴法+乙烯利法更适于梭鱼草种子的发芽。在电导率EC=5 dS/m的碱溶液中,机械法将香菇草的发芽率由14%提升至47%;热水浴法+乙烯利法将梭鱼草的发芽率由8%提升至33%。两种供试植物幼苗生长对5种催芽方法的响应各不相同。经机械法和乙烯利法处理后,盐溶液中的香菇草幼苗叶绿素含量指数高于无盐对照;高盐(EC为10 dS/m和15 dS/m)胁迫下,土培环境中经过不同催芽处理的梭鱼草幼苗的生物量和株高均几乎为0;经催芽处理后,香菇草幼苗生物量在盐胁迫下高于无盐对照。综合来看,低盐碱胁迫下适于香菇草和梭鱼草植物种子催芽的方法是机械法、乙烯利法、热水浴法+乙烯利法。本研究为盐碱湿地植被生态恢复提供了理论和方法参考。
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| 关 键 词： | 湿地植物 盐碱胁迫 香菇草 梭鱼草 催芽 发芽率 幼苗生长 |
| 收稿时间： | 2020/11/3 0:00:00 |
| 修稿时间： | 2021/3/16 0:00:00 |
Study on the methods of pregermination of wetland plants under saline and alkaline stress |
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| SUN Hui,CHENG Rui,CHENG Xian-wei,YAN Bai-xing and ZHU Hui.Study on the methods of pregermination of wetland plants under saline and alkaline stress[J].Research of Agricultural Modernization,2021,42(2):367-375. |
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| Authors: | SUN Hui CHENG Rui CHENG Xian-wei YAN Bai-xing and ZHU Hui |
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| Institution: | Northeast Institute of Geography andAgroecology, Chinese Academy of Sciences,Northeast Institute of Geography andAgroecology, Chinese Academy of Sciences,Chinese Academy of Sciences,Northeast Institute of Geography andAgroecology, Chinese Academy of Sciences,Northeast Institute of Geography andAgroecology, Chinese Academy of Sciences |
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| Abstract: | Seed germination and seedling growth are two key stages for plant growth and reproduction, but they are often affected by saline and alkaline stress. In this study, two typical wetland plants (i.e., Hydrocotyle vulgaris and Pontederia cordata) were selected and the effects of 5 pregermination methods on germination and seedling growth of which under saline and alkaline stress were investigated in growth chamber and soil pots. The results showed that the mechanical method and the ethephon method were more suitable for the germination of H. vulgaris under saline and alkaline stress. The hot water bath + ethephon method was more suitable for the germination of P. cordata under saline and alkaline stress. The germination rate of H. vulgaris was increased from 14% to 47% by the mechanical method in alkaline condition with electrical conductivity (EC) of 5 dS/m. The germination rate of P. cordata was increased from 8% to 33% by the hot water bath ethephon method in alkaline condition with EC of 5 dS/m. Different pregermination methods exhibited various effect on seedling growth of the two tested plants. The chlorophyll content index of H. vulgaris was higher than control in saline condition by the mechanical method and the ethephon method. The biomass and bud length of P. cordata were almost 0 by pregermination methods under high saline stress (i.e., EC of 10 dS/m and 15 dS/m) in soil pots. The biomass of H. vulgaris by pregermination was higher than control under saline and alkaline stress. In conclusion, the mechanical method, ethephon method, hot water bath + ethephon method are suitable for seed pregermination of H. vulgaris and P. cordata under low saline-alkali stress. This study provides both theoretical and methodological reference for the ecological restoration of plants in saline-alkaline wetlands. |
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| Keywords: | wetland plants saline-alkaline stress Hydrocotyle vulgaris Pontederia cordata pregermination germination rate seedling growth |
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