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Journal of Experimental Botany, Vol. 52, No. 358, pp. 1063-1070, May 1, 2001
© 2001 Oxford University Press

Original Papers

Alterations in carbon and nitrogen metabolism induced by water deficit in the stems and leaves of Lupinus albus L.

Carla Pinheiro1, Maria Manuela Chaves2,3 and Cândido Pinto Ricardo1,2

1 Plant Biochemistry, Instituto de Tecnologia Química e Biológica, Apartado 127, 2781-901 Oeiras, Portugal
2 Instituto Superior de Agronomia, Tapada da Ajuda, 1349-017 Lisboa, Portugal

Water deficit (WD) in Lupinus albus L. brings about tissue-specific responses that are dependent on stress intensity. Carbohydrate metabolism is very sensitive to changes in plant water status. Six days from withholding water (DAW), sucrose, glucose and fructose levels of the leaf blade had already increased over 5-fold, and the activities of SS and INVA had increased c. 1.5–2 times. From 9 DAW on, when stress intensity was more pronounced, these effects were reversed with fructose and glucose concentrations as well as INVA activity dropping in parallel. The stem (specifically the stele) responded to the stress intensification with striking increases in the concentration of sugars, N and S, and in the induction of thaumatin-like-protein and an increase in chitinase and peroxidase. At 13 DAW, the plants lost most of the leaves but on rewatering they fully recovered. Thus, the observed changes appear to contribute to a general mechanism of survival under drought, the stem playing a key role in that process.

Key words: L. albus, drought, sugars, sucrose-metabolizing enzymes, pathogenesis-related proteins.


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