Abstract
The aim of this study was (i) to evaluate the impact of water deficit and rehydration on nitrogen compounds and abscisic acid of Vigna unguiculata leaves, and (ii) to investigate the hypothesis that abscisic acid influences proline. The experimental design was entirely randomized in a factorial design, with 2 water conditions (control and stress) and 7 evaluation periods (0, 1, 2, 3, and 4 days under water deficit, followed by the 5th and 6th day under rehydration). The leaf relative water content presented significant reduction, presenting a lower value on the 4th day of treatment under water deficit. After rehydration, the plants reestablished the leaf relative water content. The correlation analysis suggested a significant relationship between the leaf relative water content and abscisic acid. The abscisic acid concentration of the plants under water deficiency were of 2.4, 45.9, 42.6, 47.9, 66.9, 9.2, and 5.5 mg kg^{-1} DM on days 0, 1, 2, 3, 4, 5, and 6, respectively. Rehydration quickly decreased abscisic acid. In addition, the correlation analysis indicated a significant relationship between abscisic acid and proline. The proline levels of the plants under stress showed significant increases by 67%, 354%, 423%, and 532% on the 1st, 2nd, 3rd, and 4th day, respectively, when compared with control plants. This study with Vigna unguiculata plants reveals negative consequence of water deficiency over nitrogen metabolism, and fast recovery after rehydration. The nitrogen compounds and enzymes presented direct and indirect responses in the osmotic adjustment of the plant, as well as increasing abscisic acid concentration with the intent to decrease water loss in Vigna unguiculata induced by the water deficiency. Furthermore, a positive relationship between abscisic acid and proline synthesis was confirmed.
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Claims 9
Claim · model-written summary
Water deficit significantly lowered leaf relative water content, lowest on day four.
- Taxon
- cowpea
Vigna unguiculatat0 - Treatment
- water deficite0
- Outcome
- leaf relative water contente0
- Direction
- reductione0
- Qualifier
- 4th daye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The leaf relative water content presented significant reduction, presenting a lower value on the 4th day of treatment under water deficit.”
t0“cowpea”
Claim · model-written summary
Rehydration restored leaf relative water content.
- Taxon
- cowpeaVigna unguiculatat0
- Treatment
- rehydratione0
- Outcome
- leaf relative water contente0
- Direction
- reestablishede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After rehydration, the plants reestablished the leaf relative water content.”
t0“cowpea”
Claim · model-written summary
Leaf relative water content was significantly related to abscisic acid.
- Taxon
- cowpeaVigna unguiculatat0
- Compound
- abscisic acide0
- Outcome
- leaf relative water contente0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The correlation analysis suggested a significant relationship between the leaf relative water content and abscisic acid.”
t0“cowpea”
Claim · model-written summary
Rehydration quickly decreased abscisic acid.
- Taxon
- cowpeaVigna unguiculatat0
- Treatment
- Rehydratione0
- Outcome
- abscisic acide0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rehydration quickly decreased abscisic acid.”
t0“cowpea”
Claim · model-written summary
Abscisic acid and proline were significantly related.
- Taxon
- cowpeaVigna unguiculatat0
- Compound
- abscisic acide0
- Outcome
- prolinee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the correlation analysis indicated a significant relationship between abscisic acid and proline.”
t0“cowpea”
Claim · model-written summary
Proline increased 67% on day one of stress versus controls.
- Taxon
- cowpeaVigna unguiculatat0
- Treatment
- stresse0
- Outcome
- proline levelse0
- Direction
- increasese0
- Value
- 67%e0
- Qualifier
- 1ste0
- Comparator
- control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The proline levels of the plants under stress showed significant increases by 67%, 354%, 423%, and 532% on the 1st, 2nd, 3rd, and 4th day, respectively, when compared with control plants.”
t0“cowpea”
Claim · model-written summary
Proline increased 354% on day two of stress versus controls.
- Taxon
- cowpeaVigna unguiculatat0
- Treatment
- stresse0
- Outcome
- proline levelse0
- Direction
- increasese0
- Value
- 354%e0
- Qualifier
- 2nde0
- Comparator
- control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The proline levels of the plants under stress showed significant increases by 67%, 354%, 423%, and 532% on the 1st, 2nd, 3rd, and 4th day, respectively, when compared with control plants.”
t0“cowpea”
Claim · model-written summary
Proline increased 423% on day three of stress versus controls.
- Taxon
- cowpeaVigna unguiculatat0
- Treatment
- stresse0
- Outcome
- proline levelse0
- Direction
- increasese0
- Value
- 423%e0
- Qualifier
- 3rde0
- Comparator
- control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The proline levels of the plants under stress showed significant increases by 67%, 354%, 423%, and 532% on the 1st, 2nd, 3rd, and 4th day, respectively, when compared with control plants.”
t0“cowpea”
Claim · model-written summary
Proline increased 532% on day four of stress versus controls.
- Taxon
- cowpeaVigna unguiculatat0
- Treatment
- stresse0
- Outcome
- proline levelse0
- Direction
- increasese0
- Value
- 532%e0
- Qualifier
- 4the0
- Comparator
- control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The proline levels of the plants under stress showed significant increases by 67%, 354%, 423%, and 532% on the 1st, 2nd, 3rd, and 4th day, respectively, when compared with control plants.”
t0“cowpea”
The same questions in other papers
drought · physiology: water · Vigna unguiculata (cowpea)Results differ
18 papers in the same direction as this paper · 8 in the opposite direction
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