植物生态学报 ›› 2005, Vol. 29 ›› Issue (5): 706-712.DOI: 10.17521/cjpe.2005.0094
收稿日期:
2004-10-11
接受日期:
2005-04-05
出版日期:
2005-10-11
发布日期:
2005-08-30
通讯作者:
王政权
基金资助:
SUN Hai-Long1, WU Chu1,2, XU Wen-Jing1, WANG Zheng-Quan1,*()
Received:
2004-10-11
Accepted:
2005-04-05
Online:
2005-10-11
Published:
2005-08-30
Contact:
WANG Zheng-Quan
About author:
* E-mail: wzqsilv@mail.nefu.edu.cn摘要:
水分吸收过程是根系重要的生理过程。水孔蛋白在根系水分径向运输中起着重要的作用,根系水流导度(Lp)的测定是研究水孔蛋白的重要途径。该研究采用压力流的方法,对相同生长条件下的水曲柳(Fraxinus mandshurica)幼苗根系进行研究,测定了根系在去离子水和不同浓度NH4NO3溶液中的Lp。结果表明:未经处理的水曲柳幼苗根系,Lp随NH4NO3浓度的增加而上升,而且NH4NO3溶液中的Lp比去离子水中的Lp平均高77%;经HgCl2处理后,水曲柳幼苗根系的Lp仍然随NH4NO3浓度的增加而增大,但是根系Lp在去离子水下降了22%,而在NH4NO3溶液中下降了68%,与以前的研究相比发现,经HgCl2处理后,以营养液为吸水基质的根系Lp的降低值普遍高于以去离子水为基质的试验。因此,基质中养分离子的存在对根系中水孔蛋白活性产生了重要的影响,进而影响根系水分的吸收过程。
孙海龙, 吴楚, 徐文静, 王政权. 水曲柳幼苗根系在不同浓度NH4NO3溶液中水流导度的变化. 植物生态学报, 2005, 29(5): 706-712. DOI: 10.17521/cjpe.2005.0094
SUN Hai-Long, WU Chu, XU Wen-Jing, WANG Zheng-Quan. VARIATIONS OF ROOT HYDRAULIC CONDUCTANCE OF MANCHURIAN ASH SEEDLINGS IN DIFFERENT CONCENTRATIONS OF NH4NO3 SOLUTIONS. Chinese Journal of Plant Ecology, 2005, 29(5): 706-712. DOI: 10.17521/cjpe.2005.0094
图1 水曲柳幼苗根系在去离子水中的Lp a: 对照 Control b: 50 μmol·L-1 HgCl2处理 50 μmol·L-1 HgCl2 treatment c: 50 μmol·L-1 HgCl2+10 mmol·L-1β-巯基乙醇处理 50 μmol·L-1 HgCl2+10 mmol·L-1β-mercaptoethanol treatment
Fig.1 Lp of seedling roots under deionized water
图2 水曲柳幼苗根系在不同浓度NH4NO3溶液中的Lp
Fig.2 Lp of seedling roots under NH4NO3 solution with different concentrations a: 2 mmol·L-1 b: 4 mmol·L-1 c: 8 mmol·L-1 d: 16 mmol·L-1
图3 水曲柳幼苗根系经过HgCl2处理后在不同浓度NH4NO3溶液中的Lp a、b、c、d: 见图2
Fig.3 Lp of seedling roots under NH4NO3 solution with different concentrations after HgCl2 treatment See Fig. 2
植物种类 Plant species | 基质溶液 Substance solution | Lp降低比率 Reduction of Lp | 资料来源 References |
---|---|---|---|
白杨 Populus tremuloides | 1.5倍浓度的Hoagland营养液 One and a half strength Hoagland solution | 47% | Wan & Zwiazek, |
番茄 Lycopersicon esculentum | 浓度减半的Hoagland营养液 Half-strength Hoagland solution | 57% | Maggio & Joly, |
辣椒 Capsicum annuum | 完全调整的Hoagland营养液 Complete modified Hoagland's nutrient solution | 66% | Carvajal et al., |
甜瓜 Cucumis melo | 调整后浓度减半的Hoagland营养液 Half-strength modified Hoaland's nutrient solution | 80% | Carvajal et al., |
甜菜 Beta vulgaris | 根渗出液 Root sap solution | 80% | Amodeo et al., |
水曲柳 Fraxinus mandshurica | 硝酸铵溶液 NH4NO3 solution | 68% | This study |
玉米 Zea mays | 去离子水 Distilled water | 53% | 慕自新等, |
仙人掌 Opuntia acanthocarpa | 去离子水 Distilled water | 32% | Martre et al., |
水曲柳 Fraxinus mandshurica | 去离子水 Distilled water | 22% | This study |
表1 经HgCl2溶液处理后,不同植物在去离子水和营养液基质中Lp的下降值
Table 1 Reductive percent of Lp in different species under deionized water and nutrition solutions after treatment of HgCl2
植物种类 Plant species | 基质溶液 Substance solution | Lp降低比率 Reduction of Lp | 资料来源 References |
---|---|---|---|
白杨 Populus tremuloides | 1.5倍浓度的Hoagland营养液 One and a half strength Hoagland solution | 47% | Wan & Zwiazek, |
番茄 Lycopersicon esculentum | 浓度减半的Hoagland营养液 Half-strength Hoagland solution | 57% | Maggio & Joly, |
辣椒 Capsicum annuum | 完全调整的Hoagland营养液 Complete modified Hoagland's nutrient solution | 66% | Carvajal et al., |
甜瓜 Cucumis melo | 调整后浓度减半的Hoagland营养液 Half-strength modified Hoaland's nutrient solution | 80% | Carvajal et al., |
甜菜 Beta vulgaris | 根渗出液 Root sap solution | 80% | Amodeo et al., |
水曲柳 Fraxinus mandshurica | 硝酸铵溶液 NH4NO3 solution | 68% | This study |
玉米 Zea mays | 去离子水 Distilled water | 53% | 慕自新等, |
仙人掌 Opuntia acanthocarpa | 去离子水 Distilled water | 32% | Martre et al., |
水曲柳 Fraxinus mandshurica | 去离子水 Distilled water | 22% | This study |
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