入侵植物牛膝菊种子萌发对PEG模拟干旱胁迫的响应

生态学杂志

入侵植物牛膝菊种子萌发对PEG模拟干旱胁迫的响应

齐淑艳^1.2**,段继鹏¹,郭婷婷¹,董晶晶¹

(¹沈阳大学生命科学与工程学院，沈阳 110044； ^2辽宁省城市有害生物治理与生态安全重点实验室，沈阳 110044)

出版日期:2014-05-10 发布日期:2014-05-10

Seed germination of invasive species Galinsoga parviflora under drought stress simulated by PEG.

QI Shu-yan^1,2**, DUAN Ji-peng¹, GUO Ting-ting¹, DONG Jing-jing¹

(¹College of Biological Science and Engineering, Shenyang University, Shenyang 110044, China; ^2Liaoning Key Laboratory of Urban Integrated Pest Management and EcoSecurity, Shenyang 110044, China)

Online:2014-05-10 Published:2014-05-10

摘要/Abstract

摘要：

采用浓度分别为5%、10%、15%、20%和25%的PEG-6000溶液模拟干旱条件，测定不同干旱胁迫条件下牛膝菊的种子萌发时间、萌发率、日相对萌发率、发芽势、发芽指数、活力指数及幼苗的初生根与胚芽的长度等指标，研究了干旱胁迫对牛膝菊种子萌发及幼苗生长的影响，探讨了经PEG浸种预处理后种子的萌发恢复能力。结果表明：随着水分胁迫的加重，牛膝菊种子萌发和幼苗生长受到抑制程度增加，牛膝菊种子的日相对萌发率、发芽率、发芽势和发芽指数、活力指数及幼苗的初生根长和胚芽长均呈下降趋势；与对照组相比，牛膝菊种子首次萌发时间延迟越长，当PEG浓度为20%、25%时牛膝菊种子未见萌发；本研究建立了水分胁迫PEG浓度与种子萌发率的线性回归方程，得出牛膝菊种子萌发的PEG浓度临界值为12.9%；经PEG浓度为20%、25%处理的种子在适宜条件下可以恢复萌发，浸种时间相同条件下，20% PEG浓度对牛膝菊种子伤害较小，其恢复性较强，25% PEG浓度对牛膝菊种子伤害较大，其恢复性较弱。

关键词: 马铃薯, 阶段耗水量, 水分利用效率, 施肥, 产量, 全膜覆盖

Abstract:

5%, 10%, 15%, 20% and 25% PEG-6000 solutions were used to simulate drought stress conditions for the germination of Galinsoga parviflora. Germination time, germination percentage, daily relative germination rate, germination potential, germination index and vigor index under each water stress were recorded. The effects of drought stress through PEG treatment on seed germination, and the germination recovery under optimal conditions after presoaking with PEG solution were studied in a series of laboratory tests. The results showed that as the water stress was aggravated, the seed germination and seedling growth were more seriously inhibited, and daily relative germination rate, germination percentage, germination potential, germination index, vigor index, and the length of seedlings and roots were decreased, and germination time was extended longer. When the PEG concentration was 20% or 25%, the seeds of G. parviflora did not germinate. The linear regression equation of seed germination under water stress predicted that the critical value of PEG concentration (drought tolerance) was 12.9%. The seeds recovered their germination under optimal conditions after presoaking with 20% or 25% PEG solution. Nevertheless, when the presoaking time was same, 20% PEG solution had little effects on the seed germination of G. parviflora, showing a strong recovery, while 25% PEG solution had adverse effects on the seed germination of G. parviflora, showing a weak recovery.

Key words: yield, whole field plastic mulching, water use efficiency, fertilizer application, seasonal water consumption, potato

齐淑艳1.2**,段继鹏1,郭婷婷1,董晶晶1. 入侵植物牛膝菊种子萌发对PEG模拟干旱胁迫的响应[J]. 生态学杂志.

QI Shu-yan1,2**, DUAN Ji-peng1, GUO Ting-ting1, DONG Jing-jing1. Seed germination of invasive species Galinsoga parviflora under drought stress simulated by PEG.[J]. cje.

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