植物生态学报 ›› 2015, Vol. 39 ›› Issue (8): 838-848.doi: 10.17521/cjpe.2015.0080

• • 上一篇    

木本植物木质部栓塞脆弱性研究新进展

李荣1*, 姜在民2*, 张硕新1,3, 蔡靖1,3**()   

  1. 1西北农林科技大学林学院, 陕西杨凌 712100
    2西北农林科技大学生命科学学院, 陕西杨凌 712100
    3陕西秦岭森林生态系统国家野外科学观测研究站, 陕西杨凌 712100
  • 收稿日期:2015-04-09 接受日期:2015-06-30 出版日期:2015-08-01 发布日期:2015-08-17
  • 作者简介:

    * 共同第一作者 Co-first author

  • 基金资助:
    国家自然科学基金面上项目(31270- 646)

A review of new research progress on the vulnerability of xylem embolism of woody plants

LI Rong1,*, JIANG Zai-Min2,*, ZHANG Shuo-Xin1,3, CAI Jing1,3,**()   

  1. 1College of Forestry, Northwest A&F University, Yangling, Shaanxi 712100, China
    2College of Life Sciences, Northwest A&F University, Yangling, Shaanxi 712100, China
    3Qinling National Forest Ecosystem Research Station, Yangling, Shaanxi 712100, China
  • Received:2015-04-09 Accepted:2015-06-30 Online:2015-08-01 Published:2015-08-17
  • Contact: Rong LI,Zai-Min JIANG,Jing CAI E-mail:cjcaijing@163.com
  • About author:

    # Co-first authors

摘要:

木质部空穴化和栓塞是木本植物在干旱等条件下遭受水分胁迫时产生的木质部输水功能障碍, 在全球气候变化的大背景下, 栓塞脆弱性对干旱响应的研究已成为热点和重要内容。近年来有关木质部栓塞脆弱性与植物输水结构和耐旱性的关系已有大量研究并取得一定成果, 但是, 不同学者在不同地区对不同材料的研究结果存在很大不同。该文就近年来这一研究领域取得的成果及争议问题进行了概括和总结, 主要涉及木质部栓塞脆弱性(P50)及脆弱曲线的建立方法、木质部栓塞脆弱性与木质部结构(导管直径、导管长度、纹孔膜、木质部密度、纤维及纤维管胞)间的关系和木质部栓塞脆弱性与耐旱性的关系, 并对未来工作进行展望, 提出在未来的工作中应对同一树种使用Cochard Cavitron离心机法、Sperry离心机技术与传统方法建立的脆弱曲线进行比较验证、计算P50值、分析植物个体器官水平差异(根、茎、叶)、测定树种生理生态指标, 探索植物栓塞脆弱性与输水结构和耐旱性的关系, 从而评估不同类型植物在未来气候变化下的耐旱能力。

关键词: 木质部栓塞, 栓塞脆弱性, 输水结构, 耐旱性

Abstract:
Xylem cavitation/embolism is the blockage of xylem conduits when woody plants suffer from water stress under drought and other environmental conditions, the study of embolism has become a hot and key topic under global climate change. Recent researches on the relationship between the vulnerability of xylem embolism and hydraulic architecture/drought tolerance have made some progress, however, scholars reached different conclusions based on results from different regions or different materials. This paper reviews the current achievements and controversial viewpoints, which includes indicator of xylem embolism vulnerability (P50), method of vulnerability curve establishment, the relationship between embolism vulnerability and hydraulic architecture (vessel diameter, vessel length, pit area, wood density, fiber and fiber tracheid) and the relationship between embolism vulnerability and drought tolerance of woody plants. Future studies should use Cochard Cavitron centrifuge and Sperry centrifuge coupled with traditional methods to establish vulnerability curves, calculate P50, analyze the difference among different organisms (root, stem, leaf), and measure physiological and ecological indexes. Future studies should be aimed to explore the relationship between the vulnerability of xylem embolism and hydraulic architecture/drought tolerance and to assess drought tolerance ability of different species under future climate change.

Key words: xylem embolism, embolism vulnerability, hydraulic architecture, drought tolerance