Abstract
A , net CO 2 assimilation rate E , leaf transpiration ETR , electron transport rate F s , fluorescence yield at steady state F m and F m ', maximal fluorescence levels when all PSII reaction centres are closed in dark‐ and light‐acclimated leaves, respectively F o and F o ', initial fluorescence levels when all PSII reaction centres are closed in dark‐ and light‐acclimated leaves, respectively F v / F m , efficiency of excitation capture by open PSII in dark‐adapted leaves ΔF / F m ', actual photochemical efficiency of PSII g , stomatal conductance NPQ , non‐photochemical quenching of chlorophyll fluorescence PPFD , photosynthetic photon flux density Ψ PD and Ψ MD , leaf water potential at pre‐dawn and midday, respectively Rl , estimated photorespiration rate I 1 and I 2 , Irrigation treatments R, Recovery treatment D 1 and D 2 , drought treatments HD 1 and HD 2 , hard drought treatments Diurnal time courses of chlorophyll fluorescence and gas‐exchange rates were measured in young potted grapevines ( Vitis vinifera L. cv. Tempranillo) subjected to different conditions of water supply under Mediterranean summer conditions. The irrigated plants exhibited typical diurnal patterns for all measured parameters, showing a correspondence between electron transport rate, net CO 2 assimilation and stomatal conductance. Mild decreases in soil‐water availability led to different degrees of down‐regulation of photosynthesis and increased nonphotochemical quenching of chlorophyll fluorescence. A good correspondence between electron transport rate and CO 2 assimilation was still maintained, suggesting a coregulation of both photosynthetic processes. In contrast, a severe water deficit induced a drastic down‐regulation of photosynthesis and breakage of the above‐mentioned link. Both midday net CO 2 assimilation and electron transport rate significantly correlated with pre‐dawn water potential ( Ψ PD ) ( r 2 = 0·65 and r 2 = 0·92, P < 0·001, respectively). However, when field data were analysed, the relationship between electron transport rate and Ψ PD was not maintained, although net CO 2 assimilation was similarly correlated with Ψ PD . Interestingly, the steady‐state chlorophyll fluorescence yield was a good indicator of plant water stress.
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Claims 11
Claim · model-written summary
Irrigated grapevines showed corresponding diurnal electron transport, CO2 assimilation and stomatal conductance.
- Treatment
- irrigated plantse0
- Outcome
- correspondence between electron transport rate, net CO 2 assimilation and stomatal conductancee0
VitisNot reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The irrigated plants exhibited typical diurnal patterns for all measured parameters, showing a correspondence between electron transport rate, net CO 2 assimilation and stomatal conductance.”
t0“grapevines”
Claim · model-written summary
Mild soil-water decline down-regulated grapevine photosynthesis.
- Treatment
- Mild decreases in soil‐water availabilitye0
- Outcome
- photosynthesise0
- Direction
- down‐regulatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mild decreases in soil‐water availability led to different degrees of down‐regulation of photosynthesis”
t0“grapevines”
Claim · model-written summary
Mild soil-water decline increased grapevine nonphotochemical fluorescence quenching.
- Treatment
- Mild decreases in soil‐water availabilitye0
- Outcome
- nonphotochemical quenching of chlorophyll fluorescencee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mild decreases in soil‐water availability led to different degrees of down‐regulation of photosynthesis and increased nonphotochemical quenching of chlorophyll fluorescence.”
t0“grapevines”
Claim · model-written summary
Under mild deficit, electron transport and CO2 assimilation remained corresponding.
- Treatment
- Mild decreases in soil‐water availabilitye0
- Outcome
- correspondence between electron transport rate and CO 2 assimilatione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mild decreases in soil‐water availability led to different degrees of down‐regulation of photosynthesis and increased nonphotochemical quenching of chlorophyll fluorescence. A good correspondence between electron transport rate and CO 2 assimilation was still maintained”
t0“grapevines”
Claim · model-written summary
Severe water deficit drastically down-regulated grapevine photosynthesis.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a severe water deficit induced a drastic down‐regulation of photosynthesis”
t0“grapevines”
Claim · model-written summary
Severe water deficit broke the correspondence between electron transport and CO2 assimilation.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a severe water deficit induced a drastic down‐regulation of photosynthesis and breakage of the above‐mentioned link”
t0“grapevines”
Claim · model-written summary
Midday CO2 assimilation correlated significantly with predawn water potential.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both midday net CO 2 assimilation and electron transport rate significantly correlated with pre‐dawn water potential ( Ψ PD ) ( r 2 = 0·65 and r 2 = 0·92, P < 0·001, respectively).”
t0“grapevines”
Claim · model-written summary
Electron transport rate correlated significantly with predawn water potential.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both midday net CO 2 assimilation and electron transport rate significantly correlated with pre‐dawn water potential ( Ψ PD ) ( r 2 = 0·65 and r 2 = 0·92, P < 0·001, respectively).”
t0“grapevines”
Claim · model-written summary
In field data, electron transport rate was not related to predawn water potential.
- Outcome
- relationship between electron transport rate and Ψ PDe0
- Direction
- not maintainede0
- Setting
- field datae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“when field data were analysed, the relationship between electron transport rate and Ψ PD was not maintained”
t0“grapevines”
Claim · model-written summary
In field data, CO2 assimilation remained correlated with predawn water potential.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“although net CO 2 assimilation was similarly correlated with Ψ PD”
t0“grapevines”
Claim · model-written summary
Steady-state chlorophyll fluorescence yield was a good indicator of grapevine water stress.
- Outcome
- plant water stresse0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the steady‐state chlorophyll fluorescence yield was a good indicator of plant water stress”
t0“grapevines”
The same questions in other papers
soil water · physiology: photosynthesis · VitisResults differ
1 paper in the same direction as this paper · 3 in the opposite direction
- positive
- positive
- positive
1 paper more in this group
See all 5 papers →drought · physiology: photosynthesis · VitisResults differ
28 papers in the same direction as this paper · 7 in the opposite direction
- negative
- negative
- negative
32 papers more in this group
See all 36 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.