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植物研究 ›› 2018, Vol. 38 ›› Issue (3): 460-466.doi: 10.7525/j.issn.1673-5102.2018.03.019

• 研究报告 • 上一篇    下一篇

油松幼苗非结构性碳水化合物对干旱胁迫的阶段性响应

王宗琰1, 王凯1, 姜涛2, 曹鹏1, 孙菊3, 王道涵1   

  1. 1. 辽宁工程技术大学环境科学与工程学院, 阜新 123000;
    2. 辽宁省风沙地改良利用研究所, 阜新 123000;
    3. 中国科学院沈阳应用生态研究所, 沈阳 110016
  • 收稿日期:2017-11-20 出版日期:2018-05-15 发布日期:2018-05-17
  • 通讯作者: 王凯,E-mail:wangkai_2005@hotmail.com E-mail:wangkai_2005@hotmail.com
  • 作者简介:王宗琰(1992-),男,硕士研究生,主要从事林业生态工程研究。
  • 基金资助:
    国家自然科学基金(31400613)

Staged Responses of Non-structural Carbohydrates of Pinus tabulaeformis Seedlings to Drought Stress

WANG Zong-Yan1, WANG Kai1, JIANG Tao2, CAO Peng1, SUN Ju3, WANG Dao-Han1   

  1. 1. College of Environmental Science and Engineering, Liaoning Engineering Technology University, Fuxin 123000;
    2. Liaoning Institute of Sandyland Improvement and Utilization, Fuxin 123000;
    3. Shenyang Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016
  • Received:2017-11-20 Online:2018-05-15 Published:2018-05-17
  • Supported by:
    Natural Science Foundation of China(31400613)

摘要: 为探讨干旱胁迫对油松非结构性碳水化合物(NSC)的影响及其响应机制,以2年生油松幼苗为对象,设置适宜水分、轻度、中度和重度干旱胁迫处理(即80%、60%、40%和20%田间持水量),比较幼苗在不同胁迫时间(15、30、45和60 d)各器官NSC含量的变化规律。结果表明:不同干旱胁迫处理程度与时间对油松幼苗当年生叶、1年生叶、茎、粗根和细根的可溶性糖、淀粉及总NSC含量均具有显著交互作用。干旱胁迫15 d时,当年生叶NSC含量在干旱胁迫处理显著低于适宜水分处理,细根NSC含量在轻度和重度胁迫处理显著高于适宜水分处理。干旱胁迫45 d时,随着胁迫程度增加,当年生叶、1年生叶、茎、粗根和细根淀粉含量均呈增加趋势。干旱胁迫60 d时,随着胁迫程度增加,细根淀粉含量呈下降趋势,细根可溶性糖及NSC含量在胁迫处理显著低于适宜水分处理。综上所述,油松幼苗胁迫初期,NSC优先供给细根以促进吸收水分,而长期胁迫,将导致NSC向下运输受阻,根系生长和吸收功能下降。这种NSC对干旱胁迫阶段性响应策略的揭示为东北地区油松幼苗造林最佳时间选择及水分管理提供数据支持。

关键词: 可溶性糖, 淀粉, 非结构性碳水化合物, 适应策略, 植物器官

Abstract: The experiment was conducted to study the effect of drought on non-structural carbohydrates(NSC) of Pinus tabulaeformis and its response mechanism, with 2-a P. tabulaeformis seedlings, we set four different water treatments including suitable water, light, moderate and serious drought stress, i. e., 80%, 60%, 40% and 20% of the field capacity. We compared the variations of NSC in different organs under different drought stress times(15, 30, 45 and 60 d). There were significant interacting effects between drought stress degree and duration on the contents of soluble sugar, starch and total NSC in current-year-old needles, 1-a needles, stems, coarse roots and fine roots of P. tabulaeformis seedlings. On the 15th day of treatment, NSC contents in current-year-old needles under drought stress were significantly lower than that under suitable water condition. Moreover, NSC content in fine roots under light and serious drought stress treatments was significantly higher than that in suitable water treatment. On the 45th day of treatment, the starch content in current-year-old needles, one-year-old needles, stems, coarse roots and fine roots increased with the increasing of drought stress degree. On the 60th day of treatment, the starch content in fine roots was declined with the increasing of stress degree, and the soluble sugar and total NSC contents in fine roots under the drought stress treatment were significantly lower than those in suitable water treatment. These findings indicated that NSC firstly supplied to roots to promote water uptake in the early stage of drought stress. However, downward translocation of NSC was inhibited, and growth and absorption ability of root decreased under long term stress. The findings of staged strategies of NSC for drought stress should provide data support for the choice of the optimum afforestation time and water management of P. tabulaeformis seedlings in Northeast China.

Key words: soluble sugar, starch, non-structural carbohydrates, adaptive strategy, plant organs

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