Abstract
Background and Objectives: In scope of roselle plant salinity tolerance, saline water irrigation is a principle cause of reduction in biomass and productivity. This study aimed to investigate the influence of three different non-enzymatic anti-oxidant protectants, i.e., ascorbic acid (AsA), citric acid and thiamin, applied as foliar spray, in ameliorating the adverse effects of salinity on Hibiscus sabdariffa L. var. Dark Red Calyces exposed to 0 and 75 mM NaCl. Materials and Methods: Pot experiment was conducted at the open field of the Experimental Farm of Agricultural Botany Department, Faculty of Agriculture, Ain Shams University, Qalyubia, Egypt, during the two successive seasons of 2016 and 2017. Growth parameters, yield components, leaf relative water content, membrane stability index and malondialdehyde and the activities of some anti-oxidants were determined. Results: Salt stress markedly decreased plant fresh and dry biomasses, leaf area, leaf fresh biomass, number of fruits, fruits dry biomass and calyces dry biomass/plant beside the loss of color in dry calyces while shoot length, root length and number of leaves relatively unaffected by exposure to salinity. Salinity also alleviated the anti-oxidant defense system in term of total soluble phenols, flavonoids, reduced glutathione (GSH) concentrations, superoxide dismutase (SOD), catalase (CAT), peroxidase (POD) and phenyl alanine ammonia lyase (PAL) activities and proline as osmoregulator. Exogenously applied AsA, citric acid and thiamin improved both growth and production in roselle plants under the two different concentrations of salinity; 0 and 75 mM NaCl. This improvement was found to be associated with increasing leaf relative water content, membrane stability index, total soluble phenols, flavonoids, proline, GSH concentrations in leaves and anthocyanins in dry calyces. On contrast, significant reduction was showed in malondialdehyde concentration when plants treated with foliar applications in compared with unsprayed plants and altered the activities of SOD, CAT, POD and PAL anti-oxidant enzymes due to balancing of the cell homeostasis under salt oxidative stress.
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Claims 16
Claim · model-written summary
Salt stress decreased plant fresh and dry biomasses, leaf area and leaf fresh biomass.
- Taxon
- Hibiscus sabdariffa L.
Hibiscus sabdariffat0 - Treatment
- Salt stresse0
- Outcome
- plant fresh and dry biomasses, leaf area, leaf fresh biomasse0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salt stress markedly decreased plant fresh and dry biomasses, leaf area, leaf fresh biomass”
t0“Hibiscus sabdariffa L.”
Claim · model-written summary
Salt stress decreased fruit number, fruit dry biomass and calyx dry biomass.
- Taxon
- Hibiscus sabdariffa L.Hibiscus sabdariffat0
- Treatment
- Salt stresse0
- Outcome
- number of fruits, fruits dry biomass and calyces dry biomass/plante0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salt stress markedly decreased plant fresh and dry biomasses, leaf area, leaf fresh biomass, number of fruits, fruits dry biomass and calyces dry biomass/plant”
t0“Hibiscus sabdariffa L.”
Claim · model-written summary
Salt stress caused color loss in dry calyces.
- Taxon
- Hibiscus sabdariffa L.Hibiscus sabdariffat0
- Treatment
- Salt stresse1
- Outcome
- loss of color in dry calycese0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“beside the loss of color in dry calyces”
t0“Hibiscus sabdariffa L.”
e1“Salt stress markedly decreased”
Claim · model-written summary
Shoot length, root length and leaf number were relatively unaffected by salinity.
- Taxon
- Hibiscus sabdariffa L.Hibiscus sabdariffat0
- Treatment
- salinitye0
- Outcome
- shoot length, root length and number of leavese0
- Direction
- relatively unaffectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“shoot length, root length and number of leaves relatively unaffected by exposure to salinity”
t0“Hibiscus sabdariffa L.”
Claim · model-written summary
Salinity alleviated total soluble phenols, flavonoids and GSH concentrations.
- Taxon
- Hibiscus sabdariffa L.Hibiscus sabdariffat0
- Treatment
- Salinitye0
- Outcome
- total soluble phenols, flavonoids, reduced glutathione (GSH) concentrationse0
- Direction
- alleviatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salinity also alleviated the anti-oxidant defense system in term of total soluble phenols, flavonoids, reduced glutathione (GSH) concentrations”
t0“Hibiscus sabdariffa L.”
Claim · model-written summary
Salinity alleviated SOD, CAT and POD activities.
- Taxon
- Hibiscus sabdariffa L.Hibiscus sabdariffat0
- Treatment
- Salinitye0
- Outcome
- superoxide dismutase (SOD), catalase (CAT), peroxidase (POD)e0
- Direction
- alleviatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salinity also alleviated the anti-oxidant defense system in term of total soluble phenols, flavonoids, reduced glutathione (GSH) concentrations, superoxide dismutase (SOD), catalase (CAT), peroxidase (POD) and phenyl alanine ammonia lyase (PAL) activities”
t0“Hibiscus sabdariffa L.”
Claim · model-written summary
Salinity alleviated PAL activity and proline.
- Taxon
- Hibiscus sabdariffa L.Hibiscus sabdariffat0
- Treatment
- Salinitye1
- Outcome
- phenyl alanine ammonia lyase (PAL) activities and prolinee0
- Direction
- alleviatede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“phenyl alanine ammonia lyase (PAL) activities and proline as osmoregulator”
t0“Hibiscus sabdariffa L.”
e1“Salinity also alleviated the anti-oxidant defense system”
Claim · model-written summary
AsA foliar spray improved roselle growth and production under both salinity levels.
- Taxon
- roselleHibiscus sabdariffae0
- Treatment
- AsAe0
- Outcome
- growth and productione0
- Direction
- improvede0
- Qualifier
- 0 and 75 mM NaCle0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exogenously applied AsA, citric acid and thiamin improved both growth and production in roselle plants under the two different concentrations of salinity; 0 and 75 mM NaCl.”
Claim · model-written summary
Citric acid foliar spray improved roselle growth and production under both salinity levels.
- Taxon
- roselleHibiscus sabdariffae0
- Treatment
- citric acide0
- Outcome
- growth and productione0
- Direction
- improvede0
- Qualifier
- 0 and 75 mM NaCle0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exogenously applied AsA, citric acid and thiamin improved both growth and production in roselle plants under the two different concentrations of salinity; 0 and 75 mM NaCl.”
Claim · model-written summary
Thiamin foliar spray improved roselle growth and production under both salinity levels.
- Taxon
- roselleHibiscus sabdariffae0
- Treatment
- thiamine0
- Outcome
- growth and productione0
- Direction
- improvede0
- Qualifier
- 0 and 75 mM NaCle0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exogenously applied AsA, citric acid and thiamin improved both growth and production in roselle plants under the two different concentrations of salinity; 0 and 75 mM NaCl.”
Claim · model-written summary
Improvement was associated with increased leaf relative water content and membrane stability index.
- Taxon
- roselleHibiscus sabdariffae1
- Organ / stage
- leafe0
- Outcome
- leaf relative water content, membrane stability indexe0
- Direction
- increasinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This improvement was found to be associated with increasing leaf relative water content, membrane stability index”
e1“roselle plants”
Claim · model-written summary
Improvement was associated with increased soluble phenols, flavonoids and proline.
- Taxon
- roselleHibiscus sabdariffae1
- Outcome
- total soluble phenols, flavonoids, prolinee0
- Direction
- increasinge0
- Qualifier
- This improvemente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This improvement was found to be associated with increasing leaf relative water content, membrane stability index, total soluble phenols, flavonoids, proline”
e1“roselle plants”
Claim · model-written summary
Improvement was associated with increased leaf GSH and dry-calyx anthocyanins.
- Taxon
- roselleHibiscus sabdariffae1
- Organ / stage
- leaves and anthocyanins in dry calycese0
- Outcome
- GSH concentrations in leaves and anthocyanins in dry calycese0
- Direction
- increasinge2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“GSH concentrations in leaves and anthocyanins in dry calyces”
e1“roselle plants”
e2“associated with increasing”
Claim · model-written summary
Foliar applications significantly reduced malondialdehyde concentration versus unsprayed plants.
- Taxon
- Hibiscus sabdariffa L.Hibiscus sabdariffat0
- Treatment
- foliar applicationse0
- Outcome
- malondialdehyde concentratione0
- Direction
- reductione0
- Comparator
- unsprayed plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“significant reduction was showed in malondialdehyde concentration when plants treated with foliar applications in compared with unsprayed plants”
t0“Hibiscus sabdariffa L.”
Claim · model-written summary
Foliar applications altered SOD, CAT and POD activities.
- Taxon
- Hibiscus sabdariffa L.Hibiscus sabdariffat0
- Treatment
- foliar applicationse1
- Outcome
- activities of SOD, CAT, PODe0
- Comparator
- unsprayed plantse1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“altered the activities of SOD, CAT, POD and PAL anti-oxidant enzymes”
t0“Hibiscus sabdariffa L.”
e1“plants treated with foliar applications in compared with unsprayed plants”
Claim · model-written summary
Foliar applications altered PAL activity.
- Taxon
- Hibiscus sabdariffa L.Hibiscus sabdariffat0
- Treatment
- foliar applicationse1
- Outcome
- PAL anti-oxidant enzymese0
- Comparator
- unsprayed plantse1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“altered the activities of SOD, CAT, POD and PAL anti-oxidant enzymes”
t0“Hibiscus sabdariffa L.”
e1“plants treated with foliar applications in compared with unsprayed plants”
The same questions in other papers
citric acid · yield · Hibiscus sabdariffa (roselle)Results agree
1 paper in the same direction as this paper
- positive
salinity · growth · Hibiscus sabdariffa (roselle)Results differ
4 papers in the same direction as this paper
- negative
- negative
- negative
1 paper more in this group
See all 5 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.