Quality and distribution of assimilates within the whole plant of lupines (L. albus And L. mutabilis) influenced by water stress

Carvalho, Isabel Saraiva de; Ricardo, C. P.; Chaves, Maria Manuela

http://hdl.handle.net/10400.1/1848

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Authors

Carvalho, Isabel Saraiva de

Ricardo, C. P.

Chaves, Maria Manuela

Abstract(s)

Lupine crops (Lupinus albus and L. mutabilis) often experience water deficits during grain filling, thereby altering partitioning of assimilates. Water deficit, imposed at the beginning of seed production (15 days after anthesis, daa), brought about differences in assimilate partitioning and chemical composition within the whole plant. In both species, water stress (ws) was responsible for a significant decrease in plant water status and gas exchange. In spite of little effect on total biomass, leaf area was reduced for approximately half of the control treatment. The main effects of ws on chemical composition of different organs were a decrease in total oil and an increase in total soluble sugar content in leaves; an increase in both oil and soluble sugars in stems; and a decrease in total oil and total soluble sugar content in seeds. The data suggest that under ws conditions, imposed at flowering, lupine assimilates are stored in stems and pods and later retranslocated to the developing seeds.