Abstract
After 45 d of limited water supply, cassava (Manihot esculenta Crantz) exhibited pronounced reduction in shoot growth, high leaf fall, and decreased stomatal conductance. However, the water status of the remaining leaves was unaffected. This was combined with an amplified heliotropic response and drooping which minimises radiant energy interception at mid-day, suggesting that leaves are sensitive to high irradiance (I). In well-irrigated plants, CO2-saturated oxygen evolution and net photosynthetic rate (P N) in air were markedly higher (5-fold) in young (expanding) leaves than in mature leaves. Water limitation did not strongly modify CO2-saturated oxygen evolution but it altered P N in air for both types of leaves, although differently. The mature leaves of drought-adapted plants displayed residual rate of P N and deteriorated photosystem 2 (PS2) photochemistry estimated from chlorophyll (Chl) a fluorescence measurements. In young leaves at moderate I, P N was depressed by only 66 % in stressed plants. Moreover, the photochemical quenching of Chl a fluorescence and the quantum efficiency of PS2 photochemistry in young leaves were comparable in both control and stressed plants. In contrast at high I, P N was almost null and marked decreases in the two fluorescence parameters were apparent. Hence the strong heliotropic response and drooping displayed by young leaves under water limitation is an important strategy for avoiding inactivation of P N by high I and therefore for cassava tolerance to drought.
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Claims 14
Claim · model-written summary
Limited water supply reduced cassava shoot growth.
- Taxon
- cassava
Manihot esculentae0 - Treatment
- limited water supplye0
- Outcome
- shoot growthe0
- Direction
- reductione0
- Qualifier
- After 45 de0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After 45 d of limited water supply, cassava (Manihot esculenta Crantz) exhibited pronounced reduction in shoot growth, high leaf fall, and decreased stomatal conductance.”
Claim · model-written summary
Limited water supply caused high cassava leaf fall.
- Taxon
- cassavaManihot esculentae0
- Treatment
- limited water supplye0
- Outcome
- leaf falle0
- Direction
- highe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After 45 d of limited water supply, cassava (Manihot esculenta Crantz) exhibited pronounced reduction in shoot growth, high leaf fall, and decreased stomatal conductance.”
Claim · model-written summary
Limited water supply decreased cassava stomatal conductance.
- Taxon
- cassavaManihot esculentae0
- Treatment
- limited water supplye0
- Outcome
- stomatal conductancee0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After 45 d of limited water supply, cassava (Manihot esculenta Crantz) exhibited pronounced reduction in shoot growth, high leaf fall, and decreased stomatal conductance.”
Claim · model-written summary
Remaining cassava leaves retained water status under limited supply.
- Taxon
- CassavaManihot esculentat0
- Treatment
- Drought-Adaptedt0
- Outcome
- water status of the remaining leavese0
- Direction
- unaffectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“However, the water status of the remaining leaves was unaffected.”
t0“Drought-Adapted Cassava”
Claim · model-written summary
Water-limited cassava leaves showed amplified heliotropism and drooping.
- Taxon
- CassavaManihot esculentat0
- Outcome
- heliotropic response and droopinge0
- Direction
- amplifiede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This was combined with an amplified heliotropic response and drooping which minimises radiant energy interception at mid-day”
t0“Drought-Adapted Cassava”
Claim · model-written summary
In well-irrigated cassava, young leaves had fivefold higher oxygen evolution and photosynthetic rate than mature leaves.
- Taxon
- CassavaManihot esculentat0
- Organ / stage
- young (expanding) leavese0
- Outcome
- CO2-saturated oxygen evolution and net photosynthetic rate (P N)e0
- Direction
- highere0
- Value
- 5-folde0
- Comparator
- mature leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In well-irrigated plants, CO2-saturated oxygen evolution and net photosynthetic rate (P N) in air were markedly higher (5-fold) in young (expanding) leaves than in mature leaves.”
t0“Drought-Adapted Cassava”
Claim · model-written summary
Water limitation did not strongly change carbon dioxide saturated oxygen evolution.
- Taxon
- CassavaManihot esculentat0
- Treatment
- Water limitatione0
- Outcome
- CO2-saturated oxygen evolutione0
- Direction
- did not strongly modifye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water limitation did not strongly modify CO2-saturated oxygen evolution”
t0“Drought-Adapted Cassava”
Claim · model-written summary
Mature drought-adapted leaves retained only a residual net photosynthetic rate.
- Taxon
- CassavaManihot esculentat0
- Organ / stage
- mature leavese0
- Outcome
- residual rate of P Ne0
- Direction
- residuale0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The mature leaves of drought-adapted plants displayed residual rate of P N and deteriorated photosystem 2 (PS2) photochemistry”
t0“Drought-Adapted Cassava”
Claim · model-written summary
Mature drought-adapted leaves had deteriorated PS2 photochemistry.
- Taxon
- CassavaManihot esculentat0
- Organ / stage
- mature leavese0
- Outcome
- photosystem 2 (PS2) photochemistrye0
- Direction
- deterioratede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The mature leaves of drought-adapted plants displayed residual rate of P N and deteriorated photosystem 2 (PS2) photochemistry”
t0“Drought-Adapted Cassava”
Claim · model-written summary
At moderate irradiance, young stressed leaves had a 66 % reduction in net photosynthesis.
- Taxon
- CassavaManihot esculentat0
- Organ / stage
- young leavese0
- Treatment
- stressed plantse0
- Outcome
- P Ne0
- Direction
- depressede0
- Value
- 66 %e0
- Qualifier
- moderate Ie0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In young leaves at moderate I, P N was depressed by only 66 % in stressed plants.”
t0“Drought-Adapted Cassava”
Claim · model-written summary
At moderate irradiance, young stressed and control leaves had comparable photochemical quenching and PS2 quantum efficiency.
- Taxon
- CassavaManihot esculentat0
- Outcome
- photochemical quenching of Chl a fluorescence and the quantum efficiency of PS2 photochemistrye0
- Direction
- comparablee0
- Comparator
- control and stressed plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the photochemical quenching of Chl a fluorescence and the quantum efficiency of PS2 photochemistry in young leaves were comparable in both control and stressed plants.”
t0“Drought-Adapted Cassava”
Claim · model-written summary
At high irradiance, net photosynthesis was almost absent.
- Taxon
- CassavaManihot esculentat0
- Outcome
- P Ne0
- Direction
- almost nulle0
- Qualifier
- high Ie0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In contrast at high I, P N was almost null and marked decreases in the two fluorescence parameters were apparent.”
t0“Drought-Adapted Cassava”
Claim · model-written summary
At high irradiance, the two fluorescence parameters decreased markedly.
- Taxon
- CassavaManihot esculentat0
- Outcome
- two fluorescence parameterse0
- Direction
- decreasese0
- Qualifier
- high Ie0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In contrast at high I, P N was almost null and marked decreases in the two fluorescence parameters were apparent.”
t0“Drought-Adapted Cassava”
Claim · model-written summary
The authors interpret leaf heliotropism and drooping under water limitation as a way to avoid high-irradiance photosynthetic inactivation.
- Taxon
- CassavaManihot esculentat0
- Organ / stage
- young leavese0
- Outcome
- avoiding inactivation of P Ne0
- Qualifier
- heliotropic response and droopinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the strong heliotropic response and drooping displayed by young leaves under water limitation is an important strategy for avoiding inactivation of P N by high I”
t0“Drought-Adapted Cassava”
The same questions in other papers
irrigation · growth · Manihot esculenta (cassava)Results differ
3 papers in the same direction as this paper · 14 in the opposite direction
- positive
- positive
- positive
14 papers more in this group
See all 18 papers →irrigation · physiology: gas exchange · Manihot esculenta (cassava)Positive and negative results
1 paper in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- negative
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.