biologia plantarum

Biologia plantarum 48:317-319, 2004 | DOI: 10.1023/B:BIOP.0000033465.59361.d2

Sucrose Metabolism in Lupinus albus L. Under Salt Stress

F.M. Fernandes^1,*, M.C. Arrabaça², L.M.M. Carvalho³

¹ Rua Pedro Soares s/n, Escola Superior de Educação de Beja, Beja, Portugal

² Departamento de Biologia Vegetal, Faculdade de Ciências da Universidade de Lisboa, Lisboa, Portugal

³ Escola Superior Agrária de Beja, Beja, Portugal

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.

Keywords: invertases; sucrose phosphate synthase; sucrose synthase; sugars

Subjects: invertases; Lupinus albus; saccharides, salt stress; salt stress, sucrose metabolism; sucrose metabolism, salt sttress; sucrose phosphate synthase

Published: June 1, 2004  Show citation