Journal
JOURNAL OF EXPERIMENTAL BOTANY
Volume 52, Issue 358, Pages 1063-1070Publisher
OXFORD UNIV PRESS
DOI: 10.1093/jexbot/52.358.1063
Keywords
L. albus; drought; sugars; sucrose-metabolizing enzymes; pathogenesis-related proteins
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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.
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