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© 1995 Oxford University Press

RESEARCH-ARTICLE

Soil-plant water relations, root distribution and biomass partitioning in Lupinus albus L. under drought conditions

M.L. Rodrigues1, C.M.A. Pacheco and M.M. Chaves

Instituto Superior de Agronomia, Universidade Tecnica de Lisboa, Tapada da Ajuda P-1399 Lisboa Codex, Portugal

1 To whom correspondence should be addressed at: Departmento de BotÂnica e Engenharia BiolÓgica, Instituto Superior de Agronomia, P-1399 Lisboa Codex, Portugal. Fax: +351 1 3635031.

Lupinus albus L. from different climatic origins responded to a 15 d period of water shortage during flowering by losing 50% of the total leaf canopy and gaining 55% in stem dry weight. Water deficits also led to a significant increase in the fine root length density and a slight increase in the fine root dry weight. The latter increase was especially pronounced in the deeper soil layers. Some marginal differences among genotypes were observed in the responses. Stomatal closure by midday was an early response to water deficit, giving rise to constant predawn leaf water potentials during the first week of water shortage in spite of a decrease of 60% in the available soil water. No osmotic regulation or adjustments of the cell wall properties were observed in any of the lupin lines. We explained the maintenance of seed production in water-stressed plants by their ability to accumulate assimilates in the shoot, which would be diverted to the pods during the seed filling stage.

Key words: Biomass partitioning, drought, Lupinus albus, root distribution, water relations.


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