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Effect of Nutrient Deficiencies on the Water Transport Properties in Figleaf Gourd Plants
이지예,정갑채,Maki Katsuhara,안성주 한국원예학회 2011 Horticulture, Environment, and Biotechnology Vol.52 No.6
Effects of nitrogen, phosphorus, and potassium deficiencies on water transport properties in figleaf gourd plants were studied. Plants were treated for different period of deficiency and physiological parameters such as stomatal conductance,photosynthesis and transpiration were measured. Cell and root pressure probes were utilized to measure turgor and root pressures, half-times of water exchange and hydraulic conductivities to analyze water transport properties. When plants were grown in nitrogen or phosphorus deficient nutrient solutions, they became insensitive to mercury, suggesting that aquaporin was closed resulting in reduced hydraulic conductivity. Inclusion of tungstate, however, restored the sensitivity of cells to mercury, indicating the importance of internal nutrient concentration, not the incoming nutrient supply. The hydrostatic hydraulic conductivity of roots grown in nitrogen deficient solution, representing apoplastic pathway of water transport, was reduced but this reduction was dramatically recovered by the application of tungstate, indicating the importance of nutrient availability from storage pools in relation to water status of plants.
Water and H₂O₂ Permeability of Aquaporins Isolated from Cucumber and Figleaf Gourd
Ji Ye Rhee,Maki Katsuhara,Hunseung Kang,Gap Chae Chung 한국원예학회 2010 Horticulture, Environment, and Biotechnology Vol.51 No.3
Cucumber aquaporin gene, CsPIP1;1 and figleaf gourd aquaporin gene CfPIP2;1 were injected to Xenopus oocytes in order to study water transport activity. While CsPIP1;1 did not transport any water and was not responsive to mercury, oocyte injected with CfPIP2;1 rapidly increased their volume without saturation indicating active water transport. Calculation of water permeability of oocytes clearly distinguished the two genes. In response to exogenous application of H₂O₂, only CfPIP2;1 responded, reducing osmotic water permeability. Transgenic Arabidopsis plants overexpressing aquaporin genes did not respond to applied H₂O₂.