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林业科学 ›› 2009, Vol. 12 ›› Issue (9): 48-52.doi: 10.11707/j.1001-7488.20090909

• 论文 • 上一篇    下一篇

水分胁迫条件下臭柏匍匐茎的蒸腾和吸水特性*

李玉灵1 王玉魁2,4 王俊刚1 三木直子3 坂本圭3 吉川3   

  1. 1.河北农业大学林学院 保定071000; 2.国家林业局泡桐研究开发中心 郑州450003;3.日本冈山大学大学院环境学研究科 冈山7008530; 4.北京林业大学水土保持学院 北京100083
  • 收稿日期:2008-09-24 修回日期:1900-01-01 出版日期:2009-09-25 发布日期:2009-09-25
  • 通讯作者: 王玉魁
  • 基金资助:
     

Transpiration and Water Uptake of Sabina vulgaris Stolon under Water Stress

Li Yuling1,Wang Yukui2,4,Wang Jungang1,Miki Naoko3,Sakamoto Keiji3,Yosikawa Ken3   

  1. 1.Forest College, Agricultural University of Hebei Baoding 071000; 2.Paulownia Research & Development Center of the State Forestry Administration Zhengzhou 450003; 3.Grad Sch Env Sci,Okayama Univ Okayama Japan 7008530; 4.College of Soil and Water Conservation,Beijing Forestry University Beijing 100083
  • Received:2008-09-24 Revised:1900-01-01 Online:2009-09-25 Published:2009-09-25
  • Supported by:
     

摘要:

在臭柏长期室内石砾土栽培条件下,通过培养液中加入PEG以调节溶液渗透势,设置对照区(pF值3.0)、水分胁迫区(pF值2.3)2种处理,并分别从匍匐茎中部人工培养不定根,测定有不定根和无不定根匍匐茎小枝的蒸腾速率、气孔导度及其水势的日变化和叶片水分特性。结果表明: 1)在水分胁迫条件下,匍匐茎先端小枝通过降低正午水势提高吸水能力; 基部小枝通过控制蒸腾,维持枝条水势防止失水。2)有不定根的匍匐茎通过降低质壁分离时的水势(ψtlpw)和充分吸水时的渗透势(ψsats)提高吸水能力,而且增加细胞弹性率,迅速降低膨压保证失水时能尽快关闭气孔; 而无不定根匍匐茎虽然吸水能力较差,但细胞壁柔软,即使蒸腾失水,也能在较长时间内维持膨压,保证生命活动进行。

关键词: 水分胁迫, 臭柏, 匍匐茎, 不定根, 水势

Abstract:

The stolons with and without adventitious roots of Sabina vulgaris were grown under controlled conditions of the pF 3.0 and pF 2.3 treatments by using PEG (polyethylene glycol) in their culture solutions. Diurnal changes of transpiration rate, stomatal conductance and water potential were measured. Leaf water relations were analyzed by Pressure-Volume curve. The results showed that: branches growing on the top part of stolons increased the ability of water absorption by lowering minimum potential under water stress. On the other hand, the constant leaf water potential of branches growing on the base part of stolons was maintained by controlling the transpiration under water stress. The stolon branches with adventitious roots uptake by decreasing water potential at turgor loss point (ψtlpw) and osmotic potential at full turgidity (ψsats ). Moreover,the rapid response of stomata avoided excessive loss of water under stress. There was high bulk modulus of elasticity (ε) of its cell wall. The stolon branches without adventitious roots showed the lower ability of water absorption under water stress conditions, but they were able to tolerate water stress with their soft cell wall which could make them to maintain a constant turgor pressure under severe water loss conditions.

Key words: water stress, Sabina vulgaris, stolon, adventitious root water potential

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