Abstract
ABSTRACT Reduction in plant growth under salt stress is due, among other factors, to changes in photochemical efficiency and, consequently, in photosynthesis. The objective of this study was to evaluate the effect of salt stress on the chlorophyll fluorescence variables in cultivars of basil (Ocimum basilicum L.). The experiment was conducted in a greenhouse, using a randomized block design in a 5 x 3 factorial scheme, corresponding to five basil cultivars (‘Grecco a Palla’, ‘Alfavaca Basilicão’, ‘Alfavaca Verde’, ‘Lemoncino’ and ‘Roxo’) and three salinity of the nutrient solution (2.0, 3.5 and 5.0 dS m-1), with three repetitions, and the experimental plot was represented by three pots containing 3.0 dm3 of coconut fiber. At the full flowering stage, plants were evaluated for chlorophyll fluorescence, when adapted to the dark, as well as under saturating light conditions. In general, there were changes in fluorescence variables only at salinity above 3.5 dS m-1. Fertigation using high-salinity water promotes strong changes in the chlorophyll a fluorescence of sensitive basil cultivars. The cultivars ‘Grecco a Palla’ and ‘Alfavaca Verde’ were little affected by the increase of salinity, being the most tolerant to salt stress. In the cultivars ‘Alfavaca Basilicão’, ‘Lemoncino’ and ‘Roxo’, chlorophyll fluorescence was strongly affected by salinity, being the most sensitive. The tolerance ranking based on chlorophyll fluorescence is: ‘Grecco a Palla’ = ‘Alfavaca Verde’ > ‘Alfavaca Basilicão’ > ‘Lemoncino’ > ‘Roxo’.
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Claims 5
Claim · model-written summary
Fluorescence variables changed only at salinity above 3.5 dS m-1 in basil.
- Taxon
- Ocimum basilicum
Ocimum basilicume0 - Treatment
- salinity above 3.5 dS m-1e1
- Outcome
- fluorescence variablese1
- Direction
- changese1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“evaluate the effect of salt stress on the chlorophyll fluorescence variables in cultivars of basil (Ocimum basilicum L.)”
e1“In general, there were changes in fluorescence variables only at salinity above 3.5 dS m-1”
Claim · model-written summary
Fertigation with high-salinity water strongly changed chlorophyll a fluorescence of sensitive basil cultivars.
- Taxon
- Ocimum basilicumOcimum basilicume0
- Material
- sensitive basil cultivarse2
- Treatment
- Fertigation using high-salinity watere2
- Outcome
- chlorophyll a fluorescencee2
- Direction
- strong changese2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“evaluate the effect of salt stress on the chlorophyll fluorescence variables in cultivars of basil (Ocimum basilicum L.)”
e2“Fertigation using high-salinity water promotes strong changes in the chlorophyll a fluorescence of sensitive basil cultivars”
Claim · model-written summary
The cultivars Grecco a Palla and Alfavaca Verde were little affected by increased salinity and were the most tolerant to salt stress.
- Taxon
- Ocimum basilicumOcimum basilicume0
- Material
- ‘Grecco a Palla’ and ‘Alfavaca Verde’e3
- Treatment
- increase of salinitye3
- Outcome
- tolerant to salt stresse3
- Qualifier
- little affectede3
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“evaluate the effect of salt stress on the chlorophyll fluorescence variables in cultivars of basil (Ocimum basilicum L.)”
e3“The cultivars ‘Grecco a Palla’ and ‘Alfavaca Verde’ were little affected by the increase of salinity, being the most tolerant to salt stress”
Claim · model-written summary
The cultivars Alfavaca Basilicão, Lemoncino and Roxo were strongly affected by salinity and were the most sensitive.
- Taxon
- Ocimum basilicumOcimum basilicume0
- Material
- ‘Alfavaca Basilicão’, ‘Lemoncino’ and ‘Roxo’e4
- Treatment
- salinitye4
- Outcome
- chlorophyll fluorescencee4
- Qualifier
- strongly affectede4
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“evaluate the effect of salt stress on the chlorophyll fluorescence variables in cultivars of basil (Ocimum basilicum L.)”
e4“In the cultivars ‘Alfavaca Basilicão’, ‘Lemoncino’ and ‘Roxo’, chlorophyll fluorescence was strongly affected by salinity, being the most sensitive”
Claim · model-written summary
The tolerance ranking based on chlorophyll fluorescence is Grecco a Palla = Alfavaca Verde > Alfavaca Basilicão > Lemoncino > Roxo.
- Taxon
- Ocimum basilicumOcimum basilicume0
- Outcome
- tolerance ranking based on chlorophyll fluorescencee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“evaluate the effect of salt stress on the chlorophyll fluorescence variables in cultivars of basil (Ocimum basilicum L.)”
e5“The tolerance ranking based on chlorophyll fluorescence is: ‘Grecco a Palla’ = ‘Alfavaca Verde’ > ‘Alfavaca Basilicão’ > ‘Lemoncino’ > ‘Roxo’”
The same questions in other papers
salinity · physiology: photosynthesis · Ocimum basilicum (basil)Results differ
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1 in the opposite direction
- 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.