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- W2149556693 abstract "Abstract It is well known that the extent of yield reduction depends not only on the severity of water stress but also on the stage of plant development. Assessing photosynthetic response of individual leaves to water deficit during the ontogeny may, therefore, offer a clue to better understand the whole plant behaviour. This research aimed at investigating the influence of early and late water stress on net photosynthesis ( P n ), carbon‐isotope discrimination and other related traits on individual leaves during ontogeny. Sugar beet plants were grown in rain‐sheltered soil columns of relevant volume (300 L), subdivided into well‐watered (WW); early (S1) and late (S2) stress. In general, water stress significantly reduced leaf lifespan and P n . Relieving the stress at about one‐third and two‐thirds of potential leaf life substantially restored P n at the levels of WW. Stressing a previously WW leaf brought about a comparatively heavier loss than stressing a leaf since the beginning. As for leaves at different phenological times, the early leaves had higher initial photosynthetic peaks but steeper falls during their lives. An insight into the relationships between P n and substomatal CO 2 concentration ( C i ) shows that in mature leaves the photosynthetic restoration following stress relief did not entail a full recovery of the electron transport rate, the parameter most severely affected by the stress. The partial reversibility of the effects of water deficiency, associated to the anticipated leaf senescence and to the natural slow‐down of net assimilation during leaf life, may be seen as a key factor in predicting to what extent the plant can tolerate drought and the damages caused by water stress." @default.
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- W2149556693 date "2007-07-11" @default.
- W2149556693 modified "2023-10-16" @default.
- W2149556693 title "Photosynthesis on individual leaves of sugar beet (Beta vulgaris) during the ontogeny at variable water regimes" @default.
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- W2149556693 doi "https://doi.org/10.1111/j.1744-7348.2007.00162.x" @default.
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