Phosphorus deficiency-induced reduction in root hydraulic conductivity in Medicago falcata is associated with ethylene production |
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| Authors: | Yan-Su Li Xiao-Tao Mao Qiu-Ying Tian Ling-Hao Li Wen-Hao Zhang |
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| Institution: | 1. Texas A&M University-Kingsville, Citrus Center, 312 N International Blvd., Weslaco, TX 78599, USA;2. South Texas College, 3201 W Pecan, McAllen, TX 78501, USA;3. Clemson University, Department of Agricultural and Environmental Sciences, 218 Biosystems Research Complex, 105 Collings Street, Clemson, SC 29634, USA;1. Jiangsu Key Lab for Organic Waste Utilization and National Engineering Research Center for Organic-based Fertilizers, Nanjing Agricultural University, 210095 China;2. Crop Physiology and Production Center (CPPC), National Key Laboratory of Crop Genetic Improvement, MOA, Huazhong Agricultural University, Wuhan, Hubei 430070, China;3. Department of Biology, Applied Plant Sciences, Technische Universität Darmstadt, Schnittspahn Strasse 10, D-64287 Darmstadt, Germany;1. Earth and Life Institute, Environmental sciences, Université catholique de Louvain, B-1348 Louvain-la-Neuve, Belgium;2. Division of Soil Physics, University of Bayreuth, Bayreuth, Germany;3. Institute of Bio- and Geosciences, IBG-3 Agrosphere, Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany;4. Division of Soil Hydrology, University of Goettingen, D-37077 Göttingen, Germany;5. Department of Agricultural Engineering, Faculty of Agriculture, University of Khartoum, Khartoum, Sudan;6. Earth and Life Institute, Agronomic sciences, Université catholique de Louvain, B-1348 Louvain-la-Neuve, Belgium |
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| Abstract: | Plants grown in phosphorus-deficient solutions often exhibit disruption of water transport due to reduction in root hydraulic conductivity (Lpr) and enhanced ethylene production. To uncover the relationship between the reduction in Lpr and increase in ethylene production, we investigated effect of phosphorus (P) deficiency on ethylene production and Lpr in legume plants of Medicago falcata L. There was an increase in ethylene production and a reduction of Lpr of M. falcata roots when M. falcata seedlings grown in P sufficient solutions (0.5 mM H2PO42?) were transferred to P-deficient solutions (5 μM H2PO42?). Antagonists of ethylene biosynthesis, CoCl2 and aminoethoxyvinylglycine (AVG), abolished the P deficiency-induced ethylene production. Root hydraulic conductivity of M. falcata seedlings grown in P-sufficient solutions was insensitive to CoCl2 and AVG, while the two chemicals enhanced Lpr for those grown in P-deficient solutions, suggesting that P deficiency-induced decrease in Lpr can be reversed by inhibiting ethylene production. Ethylene precursor 1-amino cyclopropane-1-carboxylic acid (ACC) and ethylene donor ethephon had greater inhibitory effect on Lpr of P-sufficient seedlings than that of P-deficient seedlings. Root hydraulic conductivity of P-sufficient seedlings was more sensitive to HgCl2 than that of P-deficient seedlings. Taken together, these findings suggest that ethylene induced by P deficiency may play an important role in modulation of root hydraulic conductivity by affecting aquaporins in plants. |
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