Abstract
Lentil is the fifth most important grain legume growing in arid/semi-arid regions of the world. Drought is one of the major constraints leading up to 50% of production losses just in lentil. Application of silicon (Si) has been shown to be a promising solution to improve drought tolerance; however, the biochemical mechanisms and interactions involved are not fully understood, especially in legumes. This study was designed to evaluate the effects of Si on drought stress tolerance of lentil genotypes. Seven lentil genotypes with different drought tolerance levels (tolerant, moderately tolerant and sensitive) were subjected to moderate and severe drought stress at the onset of the reproductive stage. Results showed that different drought stress treatments significantly decreased the above ground biomass, water status and the concentration of chlorophyll pigments, whereas Si supplementation of drought stressed lentil genotypes significantly improved the same traits, irrespective of their drought tolerant levels. On the other hand, Si effect on osmoregulation leads to a decline in the membrane damage and osmolytes (proline and glycine betaine) concentration in drought-stressed lentil. Application of Si to drought-stressed lentil plants significantly maintained the nitro-oxidative homeostasis by balancing the concentrations of reactive oxygen/nitrogen species, superoxide anion, hydrogen peroxide and nitrous oxide, thereby reducing the oxidative damage caused due to drought stress. Furthermore, Si supplementation also stimulated the efficiency of the glutathione (GSH)-ascorbate (ASC) cycle by increasing the concentrations of GSH and ASC as well as the activities of antioxidant enzymes like ascorbate peroxidase, guaiacol peroxidase, catalase, superoxide dismutase, glutathione reductase, dehydro-ascorbate reductase and nitrate reductase for better protection of cell membranes from reactive oxygen species. Although Si showed the same regulatory mechanisms in all the studied genotypes to protect lentil plants from moderate and severe drought stress, the defensive role of Si against drought stress was more conspicuous in drought sensitive genotypes than in the tolerant ones. Thus, this study suggests the protective role of Si on drought-stressed lentil genotypes through the modulation of nitro-oxidative homeostasis and antioxidant defence responses.
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Claims 10
Claim · model-written summary
Drought reduced lentil aboveground biomass.
- Taxon
- lentil
Lens culinarist0 - Treatment
- drought stress treatmentse0
- Outcome
- above ground biomasse0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“different drought stress treatments significantly decreased the above ground biomass, water status and the concentration of chlorophyll pigments”
t0“lentil”
Claim · model-written summary
Drought reduced lentil water status.
- Taxon
- lentilLens culinarist0
- Treatment
- drought stress treatmentse0
- Outcome
- water statuse0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“different drought stress treatments significantly decreased the above ground biomass, water status and the concentration of chlorophyll pigments”
t0“lentil”
Claim · model-written summary
Drought reduced lentil chlorophyll pigment concentration.
- Taxon
- lentilLens culinarist0
- Treatment
- drought stress treatmentse0
- Outcome
- concentration of chlorophyll pigmentse0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“different drought stress treatments significantly decreased the above ground biomass, water status and the concentration of chlorophyll pigments”
t0“lentil”
Claim · model-written summary
Silicon improved biomass, water status, and chlorophyll in drought-stressed lentil.
- Taxon
- lentilLens culinarise0
- Treatment
- Si supplementatione0
- Outcome
- above ground biomass, water status and the concentration of chlorophyll pigmentst0
- Direction
- improvede0
- Qualifier
- irrespective of their drought tolerant levelse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Si supplementation of drought stressed lentil genotypes significantly improved the same traits, irrespective of their drought tolerant levels”
t0“above ground biomass, water status and the concentration of chlorophyll pigments”
Claim · model-written summary
Silicon reduced membrane damage in drought-stressed lentil.
- Taxon
- lentilLens culinarise0
- Treatment
- Sie0
- Outcome
- membrane damagee0
- Direction
- declinee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Si effect on osmoregulation leads to a decline in the membrane damage and osmolytes (proline and glycine betaine) concentration in drought-stressed lentil”
Claim · model-written summary
Silicon reduced proline and glycine betaine concentrations.
- Taxon
- lentilLens culinarise0
- Treatment
- Sie0
- Outcome
- osmolytes (proline and glycine betaine) concentratione0
- Direction
- declinee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Si effect on osmoregulation leads to a decline in the membrane damage and osmolytes (proline and glycine betaine) concentration in drought-stressed lentil”
Claim · model-written summary
Silicon maintained nitro-oxidative homeostasis and reduced oxidative damage.
- Taxon
- lentilLens culinarise0
- Treatment
- Application of Sie0
- Outcome
- oxidative damagee0
- Direction
- reducinge0
- Qualifier
- balancing the concentrations of reactive oxygen/nitrogen species, superoxide anion, hydrogen peroxide and nitrous oxidee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of Si to drought-stressed lentil plants significantly maintained the nitro-oxidative homeostasis by balancing the concentrations of reactive oxygen/nitrogen species, superoxide anion, hydrogen peroxide and nitrous oxide, thereby reducing the oxidative damage caused due to drought stress”
Claim · model-written summary
Silicon increased glutathione and ascorbate concentrations.
- Taxon
- lentilLens culinarist0
- Treatment
- Si supplementatione0
- Outcome
- concentrations of GSH and ASCe0
- Direction
- increasinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Si supplementation also stimulated the efficiency of the glutathione (GSH)-ascorbate (ASC) cycle by increasing the concentrations of GSH and ASC”
t0“lentil”
Claim · model-written summary
Silicon increased multiple antioxidant enzyme activities.
- Taxon
- lentilLens culinarist0
- Treatment
- Si supplementationt1
- Outcome
- activities of antioxidant enzymese0
- Qualifier
- better protection of cell membranese0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“activities of antioxidant enzymes like ascorbate peroxidase, guaiacol peroxidase, catalase, superoxide dismutase, glutathione reductase, dehydro-ascorbate reductase and nitrate reductase for better protection of cell membranes”
t0“lentil”
t1“Si supplementation also stimulated”
Claim · model-written summary
Silicon protection was more conspicuous in drought-sensitive than tolerant genotypes.
Verbatim
e0“the defensive role of Si against drought stress was more conspicuous in drought sensitive genotypes than in the tolerant ones”
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drought · physiology: pigments · Lens culinaris (lentil)Positive and negative results
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See all 21 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.