Sucrose Metabolism in Lupinus albus L. Under Salt Stress |
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Authors: | F.M. Fernandes M.C. Arrabaça L.M.M. Carvalho |
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Affiliation: | (1) Rua Pedro Soares s/n, Escola Superior de Educação de Beja, 7800 Beja, Portugal;(2) Departamento de Biologia Vegetal, Faculdade de Ciências da Universidade de Lisboa, Campo Grande, 1749 Lisboa, Portugal;(3) Escola Superior Agrária de Beja, Rua Pedro Soares s/n, 7800 Beja, Portugal |
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Abstract: | Salt stress (50 and 150 mM NaCl) effects on sucrose metabolism was determined in Lupinus albus L. Sucrose synthase (SS) activity increased under salt stress and sucrose phosphate synthase activity decreased. Acid invertase activity was higher at 50 mM NaCl and decreased to control levels at 150 mM NaCl. Alkaline invertase activity increased with the salt stress. Glucose content decreased with salt stress, sucrose content was almost three times higher in plants treated with 150 mM NaCl and fructose content did not change significantly. The most significant response of lupin plants to NaCl excess is the increase of sucrose content in leaves, which is partially due to SS activity increase under salinity. This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | invertases sucrose phosphate synthase sucrose synthase sugars |
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