Abstract
Cassava ( Manihot esculenta Crantz) responds to decreases in water status by pronounced stomatal closure and decreased leaf area growth. Many water deficit responses are thought to be regulated by abscisic acid (ABA). To evaluate the extent to which ABA accumulated in a temporal pattern related to water deficit and leaf area growth, five cassava genotypes were grown in greenhouse conditions and subjected to water deficit and recovery treatments during the vegetative‐growth stage. Young and mature leaves were sampled for analysis of area growth and ABA. Under water deficit, leaves from all genotypes rapidly accumulated large amounts of ABA in both mature and young leaves. Correspondingly, young leaves halted leaf expansion growth and transpiration rate decreased. Young leaves accumulated more ABA than mature leaves in both the control and stressed treatments. The high ABA levels under water deficit were completely reversed to control levels after 1 d of rewatering. This rapid return to control ABA levels corresponded with a rapid recovery of leaf area growth rates. We postulate that the rapid reduction in leaf area growth and stomatal closure observed in our study may be due to cassava's ability to rapidly synthesize and accumulate ABA at an early phase of a water deficit episode.
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Claims 7
Claim · model-written summary
Under water deficit, leaves of all cassava genotypes rapidly accumulated large amounts of ABA in both mature and young leaves.
- Taxon
- Cassava
Manihot esculentat0 - Organ / stage
- mature and young leavese1
- Treatment
- Water Deficitt0
- Outcome
- ABAe1
- Direction
- accumulatede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Under water deficit, leaves from all genotypes rapidly accumulated large amounts of ABA in both mature and young leaves”
t0“Cassava to Water Deficit”
Claim · model-written summary
Young cassava leaves halted leaf expansion growth under water deficit.
- Taxon
- CassavaManihot esculentat0
- Organ / stage
- young leavese1
- Treatment
- Water Deficitt0
- Outcome
- leaf expansion growthe1
- Direction
- haltede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Correspondingly, young leaves halted leaf expansion growth and transpiration rate decreased”
t0“Cassava to Water Deficit”
Claim · model-written summary
Transpiration rate of cassava decreased under water deficit.
- Taxon
- CassavaManihot esculentat0
- Treatment
- Water Deficitt0
- Outcome
- transpiration ratee1
- Direction
- decreasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Correspondingly, young leaves halted leaf expansion growth and transpiration rate decreased”
t0“Cassava to Water Deficit”
Claim · model-written summary
Young cassava leaves accumulated more ABA than mature leaves in both control and stressed treatments.
- Taxon
- CassavaManihot esculentat0
- Organ / stage
- Young leavese1
- Outcome
- ABAe1
- Direction
- moree1
- Qualifier
- both the control and stressed treatmentse1
- Comparator
- mature leavese1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Young leaves accumulated more ABA than mature leaves in both the control and stressed treatments”
t0“Cassava to Water Deficit”
Claim · model-written summary
The high ABA levels under water deficit were completely reversed to control levels after 1 d of rewatering.
- Taxon
- CassavaManihot esculentat0
- Treatment
- rewateringe1
- Outcome
- ABA levelse1
- Direction
- reversede1
- Value
- 1 de1
- Comparator
- control levelse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The high ABA levels under water deficit were completely reversed to control levels after 1 d of rewatering”
t0“Cassava to Water Deficit”
Claim · model-written summary
The rapid return to control ABA levels corresponded with a rapid recovery of leaf area growth rates in cassava.
- Taxon
- CassavaManihot esculentat0
- Compound
- ABAe1
- Outcome
- recovery of leaf area growth ratese1
- Direction
- increaseinferrede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“This rapid return to control ABA levels corresponded with a rapid recovery of leaf area growth rates”
t0“Cassava to Water Deficit”
Claim · model-written summary
The authors postulate that the rapid reduction in leaf area growth and stomatal closure may be due to cassava's ability to rapidly synthesize and accumulate ABA early in water deficit.
- Taxon
- cassavaManihot esculentae1
- Compound
- ABAe1
- Outcome
- rapid reduction in leaf area growth and stomatal closuree1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“the rapid reduction in leaf area growth and stomatal closure observed in our study may be due to cassava's ability to rapidly synthesize and accumulate ABA”