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.
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Claims 7
Claim · model-written summary
Water stress significantly reduced sugar beet leaf lifespan and net photosynthesis relative to well-watered plants.
- Taxon
- sugar beet
Beta vulgaris subsp. vulgarist0 - Treatment
- water stresse1
- Outcome
- leaf lifespan and P ne1
- Direction
- reducede1
- Comparator
- WWe7
- Setting
- rain‐sheltered soil columnse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sugar beet (Beta vulgaris)”
e1“water stress significantly reduced leaf lifespan and P n”
e7“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”
Claim · model-written summary
Relieving the stress at one-third or two-thirds of leaf life substantially restored net photosynthesis to well-watered levels.
- Taxon
- sugar beetBeta vulgaris subsp. vulgarist0
- Treatment
- Relieving the stresse2
- Outcome
- P ne2
- Direction
- restorede2
- Comparator
- WWe2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sugar beet (Beta vulgaris)”
e2“Relieving the stress at about one‐third and two‐thirds of potential leaf life substantially restored P n at the levels of WW”
Claim · model-written summary
Stressing a previously well-watered leaf caused a comparatively heavier loss than stressing a leaf from the beginning of its life.
- Taxon
- sugar beetBeta vulgaris subsp. vulgarist0
- Treatment
- Stressing a previously WW leafe3
- Outcome
- losse3
- Direction
- comparatively heaviere3
- Comparator
- stressing a leaf since the beginninge3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sugar beet (Beta vulgaris)”
e3“Stressing a previously WW leaf brought about a comparatively heavier loss than stressing a leaf since the beginning”
Claim · model-written summary
Early sugar beet leaves had higher initial photosynthetic peaks than later leaves.
- Taxon
- sugar beetBeta vulgaris subsp. vulgarist0
- Organ / stage
- early leavese4
- Outcome
- initial photosynthetic peakse4
- Direction
- highere4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sugar beet (Beta vulgaris)”
e4“the early leaves had higher initial photosynthetic peaks but steeper falls during their lives”
Claim · model-written summary
Early sugar beet leaves showed steeper photosynthetic falls during their lives.
- Taxon
- sugar beetBeta vulgaris subsp. vulgarist0
- Organ / stage
- early leavese4
- Outcome
- fallse4
- Direction
- steepere4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sugar beet (Beta vulgaris)”
e4“the early leaves had higher initial photosynthetic peaks but steeper falls during their lives”
Claim · model-written summary
In mature leaves, photosynthetic restoration after stress relief did not fully restore the electron transport rate.
- Taxon
- sugar beetBeta vulgaris subsp. vulgarist0
- Organ / stage
- mature leavese5
- Outcome
- full recovery of the electron transport ratee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sugar beet (Beta vulgaris)”
e5“in mature leaves the photosynthetic restoration following stress relief did not entail a full recovery of the electron transport rate”
Claim · model-written summary
Electron transport rate was the parameter most severely affected by water stress.
- Taxon
- sugar beetBeta vulgaris subsp. vulgarist0
- Outcome
- electron transport ratee6
- Qualifier
- the parameter most severely affected by the stresse6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“sugar beet (Beta vulgaris)”
e6“the electron transport rate, the parameter most severely affected by the stress”
The same questions in other papers
drought · physiology: photosynthesis · Beta vulgaris (beet)Results agree
8 papers in the same direction as this paper
- no effect
- negative
- negative
5 papers more in this group
See all 9 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.