TY - JOUR T1 - Salt-induced expression of NADP-dependent isocitrate dehydrogenase and ferredoxin-dependent glutamate synthase in Mesembryanthemum crystallinum. AU - Popova,Olga V, AU - Ismailov,Stanislav F, AU - Popova,Tatyana N, AU - Dietz,Karl-Josef, AU - Golldack,Dortje, Y1 - 2002/07/10/ PY - 2001/12/21/received PY - 2002/05/11/accepted PY - 2002/10/2/pubmed PY - 2003/1/24/medline PY - 2002/10/2/entrez SP - 906 EP - 13 JF - Planta JO - Planta VL - 215 IS - 6 N2 - NADP-specific isocitrate dehydrogenase is a key cytosolic enzyme that links C and N metabolism by supplying C skeletons for primary N assimilation in plants. We report the characterization of the transcript Mc-ICDH1 encoding an NADP-dependent isocitrate dehydrogenase (NADP-ICDH, EC 1.1.1.42) from the facultative halophyte Mesembryanthemum crystallinum L., focussing on salt-dependent regulation of the enzyme. The activity of NADP-ICDH in plants adapted to high salinity increased in leaves and decreased in roots. By transcript analyses and Western-type hybridizations, expression of Mc-ICDH1 was found to be stimulated in leaves in salt-adapted M. crystallinum. By immunocytological analyses, NADP-ICDH proteins were localized to most cell types with strongest expression in epidermal cells and in the vascular tissue. In leaves of salt-adapted plants, signal intensities increased in mesophyll cells. In contrast to Mc-ICDH1, the activity and transcript abundance of ferredoxin-dependent glutamate synthase (Fd-GOGAT, EC 1.4.7.1), which is the key enzyme of N assimilation and biosynthesis of amino acids, decreased in leaves in response to salt stress. The physiological roles of NADP-ICDH and Fd-GOGAT in the adaptation of plants to high salinity are discussed. SN - 0032-0935 UR - https://www.unboundmedicine.com/medline/citation/12355150/Salt_induced_expression_of_NADP_dependent_isocitrate_dehydrogenase_and_ferredoxin_dependent_glutamate_synthase_in_Mesembryanthemum_crystallinum_ DB - PRIME DP - Unbound Medicine ER -