Abstract
This study was conducted to determine the effect of various flooding durations on the growth, water relations, and photosynthesis of the snap bean (Phaseolus vulgaris L.). Greenhouse-grown plants of cv . Blue Lake 274 were flooded for 0 (control), 1, 3, 5, or 7 days. Leaf water potential (ψ), stomatal conductance (g s ), transpiration (E), and net photosynthesis (Pn) were measured at the completion of the flooding period and after recovery for 7 days. Root, stem, and leaf dry weights were recorded after plants were allowed to recover from the flooding stress for 7 days. The values for ψ, g s , E, and Pn decreased quadratically with the increase in the duration of flooding. The Pn of plants flooded for 1 day was 17% lower than that of the control and it reached near zero in plants flooded for 7 days. The decrease in Pn after 1 day of flooding was not associated with ψ or g s ; however, for longer duration of flooding, Pn decline coincided with the decline in g s . A week after the cessation of flooding, the level of recovery in ψ, E, and Pn was linear and that in g s quadratic to the duration of prior stress experienced by the plant. However, after recovering for 7 days, none of the flooded plants regained gas exchange activities at par with the control. The relationship of stem dry weight to duration of flooding was linear, while a quadratic model provided the best fit for the regression of root and leaf dry weight on the number of days of flooding. Overall, even 1 day of flooding reduces photosynthesis in snap bean and causes a decrease in dry weight of the plant. the extent of decrease in both increasing with the duration of flooding.
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Claims 11
Claim · model-written summary
Leaf water potential, stomatal conductance, transpiration and net photosynthesis decreased quadratically as flooding duration increased.
Verbatim
e0“The values for ψ, g s , E, and Pn decreased quadratically with the increase in the duration of flooding.”
t0“Snap Bean”
e1“Blue Lake 274”
Claim · model-written summary
One day of flooding reduced net photosynthesis by 17% relative to controls.
Verbatim
e0“The Pn of plants flooded for 1 day was 17% lower than that of the control”
t0“Snap Bean”
Claim · model-written summary
Seven days of flooding brought net photosynthesis near zero.
Not reportedComparator
Verbatim
e0“it reached near zero in plants flooded for 7 days”
t0“Snap Bean”
Claim · model-written summary
After one day of flooding, reduced photosynthesis was not associated with leaf water potential or stomatal conductance.
Not reportedDirection
Verbatim
e0“The decrease in Pn after 1 day of flooding was not associated with ψ or g s”
t0“Snap Bean”
Claim · model-written summary
Under longer flooding, photosynthesis decline coincided with stomatal conductance decline.
Verbatim
e0“for longer duration of flooding, Pn decline coincided with the decline in g s”
t0“Snap Bean”
Claim · model-written summary
Recovery of leaf water potential, transpiration and photosynthesis after a week was linear with prior flooding duration.
- Taxon
- Snap Beant0
- Treatment
- duration of prior stresse0
- Outcome
- recovery in ψ, E, and Pne0
- Qualifier
- lineare0
Not reportedDirection
Verbatim
e0“the level of recovery in ψ, E, and Pn was linear and that in g s quadratic to the duration of prior stress”
t0“Snap Bean”
Claim · model-written summary
Recovery of stomatal conductance after a week followed a quadratic relation with prior flooding duration.
Not reportedDirection
Verbatim
e0“the level of recovery in ψ, E, and Pn was linear and that in g s quadratic to the duration of prior stress”
t0“Snap Bean”
Claim · model-written summary
Flooded plants had not regained control-level gas exchange after seven days of recovery.
Verbatim
e0“after recovering for 7 days, none of the flooded plants regained gas exchange activities at par with the control”
t0“Snap Bean”
Claim · model-written summary
Stem dry weight had a linear relation with flooding duration.
Not reportedDirection
Verbatim
e0“The relationship of stem dry weight to duration of flooding was linear”
t0“Snap Bean”
Claim · model-written summary
Root and leaf dry weight had quadratic relations with days of flooding.
Not reportedDirection
Verbatim
e0“a quadratic model provided the best fit for the regression of root and leaf dry weight on the number of days of flooding”
t0“Snap Bean”
Claim · model-written summary
Even one day of flooding decreased plant dry weight, with greater decreases over longer flooding.
Not reportedComparator
Verbatim
e0“even 1 day of flooding reduces photosynthesis in snap bean and causes a decrease in dry weight of the plant. the extent of decrease in both increasing with the duration of flooding”
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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.