Abstract
Abstract Increasing world temperatures are bringing about climate changes creating abiotic stress in plants. Date palm offshoot leaves (Khadrawi cv.) were analyzed for chlorophyll Chl a, Chl b, Total Chl, Chl a/b ratio, anthocyanin and carotenoid subject to salinity, drought and temperature stress under field conditions. Results demonstrated that drought and salinity stress accompanied by high temperatures in July and August significantly reduced the Chl a , Chl b , and Total Chl relative to the control. Anthocyanins, carotenoids, hydrogen peroxide, and malondialdehyde were markedly higher in July and August (45 ºC), whereas September showed lower values in these substances. Temperature reduction to 35 °C accompanied by drought or salinity stress, brought about a critical increment in relative water content and a decrease in electrolyte leakage. Although the impact of drought and salinity stress continued, the reduced temperatures in September resulted in a reduction of abscisic acid and proline concentration. Cluster analysis showed the two groups. In this first group, the significant similarity between the treatments is illustrated by the influence of the high temperature of 43–45 ºC. Recovery of photosynthesis following low-temperature, for the most part, determines plant flexibility to water deficiencies and salinity. Thermal stress, associated with salinity or drought stress is more damaging to the photosynthetic pigments than any single factor.
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Claims 10
Claim · model-written summary
Drought and salinity with high July and August temperature significantly reduced chlorophyll a, chlorophyll b and total chlorophyll.
- Taxon
- Date palm
Phoenix dactyliferat0 - Treatment
- drought and salinity stress accompanied by high temperatures in July and Auguste0
- Outcome
- Chl a , Chl b , and Total Chle0
- Direction
- reducede0
- Comparator
- the controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“drought and salinity stress accompanied by high temperatures in July and August significantly reduced the Chl a , Chl b , and Total Chl relative to the control.”
t0“Date palm”
Claim · model-written summary
Anthocyanins, carotenoids and hydrogen peroxide were higher in July and August at 45 ºC than in September.
- Taxon
- Date palmPhoenix dactyliferat0
- Outcome
- Anthocyanins, carotenoids, hydrogen peroxidee0
- Direction
- highere0
- Qualifier
- 45 ºCe0
- Comparator
- Septembere0
- Setting
- July and Auguste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Anthocyanins, carotenoids, hydrogen peroxide, and malondialdehyde were markedly higher in July and August (45 ºC), whereas September showed lower values in these substances.”
t0“Date palm”
Claim · model-written summary
Malondialdehyde was higher in July and August at 45 ºC than in September.
- Taxon
- Date palmPhoenix dactyliferat0
- Outcome
- malondialdehydee0
- Direction
- highere0
- Qualifier
- 45 ºCe0
- Comparator
- Septembere0
- Setting
- July and Auguste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Anthocyanins, carotenoids, hydrogen peroxide, and malondialdehyde were markedly higher in July and August (45 ºC), whereas September showed lower values in these substances.”
t0“Date palm”
Claim · model-written summary
Reducing temperature to 35 °C under drought or salinity increased relative water content.
- Taxon
- Date palmPhoenix dactyliferat0
- Treatment
- Temperature reduction to 35 °C accompanied by drought or salinity stresse0
- Outcome
- relative water contente0
- Direction
- incremente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Temperature reduction to 35 °C accompanied by drought or salinity stress, brought about a critical increment in relative water content and a decrease in electrolyte leakage.”
t0“Date palm”
Claim · model-written summary
Reducing temperature to 35 °C under drought or salinity decreased electrolyte leakage.
- Taxon
- Date palmPhoenix dactyliferat0
- Treatment
- Temperature reduction to 35 °C accompanied by drought or salinity stresse0
- Outcome
- electrolyte leakagee0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Temperature reduction to 35 °C accompanied by drought or salinity stress, brought about a critical increment in relative water content and a decrease in electrolyte leakage.”
t0“Date palm”
Claim · model-written summary
Lower September temperatures reduced abscisic acid concentration despite continued drought and salinity.
- Taxon
- Date palmPhoenix dactyliferat0
- Treatment
- reduced temperatures in Septembere0
- Outcome
- abscisic acide0
- Direction
- reductione0
- Qualifier
- drought and salinity stress continuede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Although the impact of drought and salinity stress continued, the reduced temperatures in September resulted in a reduction of abscisic acid and proline concentration.”
t0“Date palm”
Claim · model-written summary
Lower September temperatures reduced proline concentration despite continued drought and salinity.
- Taxon
- Date palmPhoenix dactyliferat0
- Treatment
- reduced temperatures in Septembere0
- Outcome
- proline concentratione0
- Direction
- reductione0
- Qualifier
- drought and salinity stress continuede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Although the impact of drought and salinity stress continued, the reduced temperatures in September resulted in a reduction of abscisic acid and proline concentration.”
t0“Date palm”
Claim · model-written summary
Cluster analysis separated treatments into two groups, with one group reflecting high temperature similarity.
- Taxon
- Date palmPhoenix dactyliferat0
- Outcome
- two groupse0
- Qualifier
- high temperature of 43–45 ºCe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cluster analysis showed the two groups. In this first group, the significant similarity between the treatments is illustrated by the influence of the high temperature of 43–45 ºC.”
t0“Date palm”
Claim · model-written summary
Recovery of photosynthesis after lower temperature largely determines flexibility to water deficiency and salinity.
- Taxon
- Date palmPhoenix dactyliferat0
- Outcome
- plant flexibility to water deficiencies and salinitye0
- Qualifier
- Recovery of photosynthesis following low-temperaturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Recovery of photosynthesis following low-temperature, for the most part, determines plant flexibility to water deficiencies and salinity.”
t0“Date palm”
Claim · model-written summary
Combined thermal and drought or salinity stress damaged photosynthetic pigments more than a single stress factor.
- Taxon
- Date palmPhoenix dactyliferat0
- Treatment
- Thermal stress, associated with salinity or drought stresse0
- Outcome
- photosynthetic pigmentse0
- Direction
- more damaginge0
- Comparator
- any single factore0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Thermal stress, associated with salinity or drought stress is more damaging to the photosynthetic pigments than any single factor.”
t0“Date palm”
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drought · physiology: photosynthesis · Phoenix dactylifera (date palm)Results agree
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salinity · physiology: photosynthesis · Phoenix dactylifera (date palm)Results agree
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See all 6 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.