| Comparison of Three Methods for Determination of Root Hydraulic Conductivity of Maize （Zea mays L.） Root System |
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| 作者姓名： | LI Qing-ming LIU Bin-bin |
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| 作者单位： | LI Qing-ming(State Key Laboratory of Crop Biology,Shandong Agricultural University,Tai'an 271018,P.R.China;Key Laboratory of Horticultural Crop Biology,Ministry of Agriculture/Shandong Agricultural University,Tai'an 271018,P.R.China);LIU Bin-bin(State Key Laboratory of Crop Biology,Shandong Agricultural University,Tai'an 271018,P.R.China) |
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| 摘 要： | Three techniques of root pressure probe, pressure chamber and high pressure flow meter were used to measure the hydraulic conductivities （Lpr） of whole root systems of young maize （Zea mays L.） seedlings grown hydroponically under either drought or normal water conditions. Compared to normal water conditions, drought stress simulated by polyethylene glycol 6 000 （osmotic potential =-0.2 MPa） reduced Lpr in the root system by over 50%. It indicated that water permeability in the roots decreased significantly when plants suffered from water shortages. Moreover, there was no significant difference （P〈 0.05） on the Lpr values in the root systems developed under a given water stress regime among the three techniques used. Therefore, all three methods are acceptable to study the hydraulic conductivity of maize seedling root systems. We have also highlighted some of the technical limitations of each method. It can be inferred that the root pressure probe is preferable for young maize seedlings because it is subtle and has the additional ability to determine solute transport properties, but the method is time consuming. Other advantages and disadvantages of each technique are discussed in order to acquaint researchers with basic information that could contribute to their choice of an appropriate technique for future studies.
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| 关 键 词： | 玉米根系 水电导率 测定方法 技术系统 压力探针 干旱胁迫 能力要求 根系导水率 |
| 收稿时间： | 16 April 2010 |
Comparison of Three Methods for Determination of Root Hydraulic Conductivity of Maize (Zea mays L.) Root System |
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| LI Qing-ming,LIU Bin-bin.Comparison of Three Methods for Determination of Root Hydraulic Conductivity of Maize (Zea mays L.) Root System[J].Agricultural Sciences in China,2010,9(10):1438-1447. |
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| Authors: | LI Qing-ming LIU Bin-bin |
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| Institution: | 1. State Key Laboratory of Crop Biology, Shandong Agricultural University, Tai''an 271018, P.R. China;2. Key Laboratory of Horticultural Crop Biology, Ministry of Agriculture/Shandong Agricultural University, Tai''an 271018, P.R. China;1. Université catholique de Louvain, Institut des Sciences de la Vie, Croix du Sud, 4-L7.07.14, 1348 Louvain-la-Neuve, Belgium;2. Leibniz Institute of Plant Genetics and Crop Plant Research, Corrensstrasse 3, 06466 Gatersleben, Germany |
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| Abstract: | Three techniques of root pressure probe,pressure chamber and high pressure flow meter were used to measure the hydraulic conduetivities (Lp,) of whole root systems of young maize (Zea mays L.) seedlings grown hydroponically under either drought or normal water conditions.Compared to normal water conditions,drought stress simulated by polyethylene glycol 6 000 (osmotic potential=-0.2 MPa) reduced Lp,in the root system by over 50%.It indicated that water permeability in the roots decreased significantly when plants suffered from water shortages.Moreover,there was no significant difference (P＜0.05) on the Lpr values in the root systems developed under a given water stress regime among the three techniques used.Therefore,all three methods are acceptable to study the hydraulic conductivity of maize seedling root systems.We have also highlighted some of the technical limitations of each method.It can be inferred that the root pressure probe is preferable for young maize seedlings because it is subtle and has the additional ability to determine solute transport properties,but the method is time consuming.Other advantages and disadvantages of each technique are discussed in order to acquaint researchers with basic information that could contribute to their choice of an appropriate technique for future studies. |
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| Keywords: | hydraulic conductivity Zea mays L root pressure probe pressure chamber high pressure flow meter |
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