Abstract
Hydroponics need water of good quality to prepare a balanced nutrient solution that could allow plants to reach their maximum yield potential. The rising difficulties in finding water with good quality have led to the compelling necessity of identifying sustainable ways to use saline water, limiting its negative effect on crop yield and quality. The exogenous supplementation of plant growth regulators, such as gibberellic acid (GA3), can be effective in increasing plant growth and vigor, thus helping plants to better cope with salt stress. The aim of this study was to evaluate the feasibility to increase the salt tolerance of leaf lettuce and rocket grown in a floating system by adding GA3 (10−6 M) to mineral nutrient solutions (MNS) with increasing salinity (0, 10, and 20 mM NaCl). Leaf lettuce and rocket plants suffered a significant reduction of growth and yield, determined by the reduction of biomass, leaf number, and leaf area, even with moderate salt stress (10 mM NaCl). The supplementation of exogenous GA3 through the MNS allowed plants to substantially counterbalance salt stress by enhancing various morphological and physiological traits, such as biomass accumulation, leaf expansion, stomatal conductance and water and nitrogen use efficiency. The effects of salt stress and GA3 treatment varied according to the species, thus indicating that this interaction may improve salt tolerance by activating different adaptation systems.
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Claims 5
Claim · model-written summary
Leaf lettuce growth and yield fell significantly even at 10 mM NaCl.
- Taxon
- Leaf lettucee0
- Treatment
- moderate salt stress (10 mM NaCl)e0
- Outcome
- growth and yielde0
- Direction
- reductione0
Not reportedComparator
Verbatim
e0“Leaf lettuce and rocket plants suffered a significant reduction of growth and yield, determined by the reduction of biomass, leaf number, and leaf area, even with moderate salt stress (10 mM NaCl).”
Claim · model-written summary
rocket growth and yield fell significantly even at 10 mM NaCl.
- Taxon
- rockete0
- Treatment
- moderate salt stress (10 mM NaCl)e0
- Outcome
- growth and yielde0
- Direction
- reductione0
Not reportedComparator
Verbatim
e0“Leaf lettuce and rocket plants suffered a significant reduction of growth and yield, determined by the reduction of biomass, leaf number, and leaf area, even with moderate salt stress (10 mM NaCl).”
Claim · model-written summary
Exogenous GA3 enhanced biomass accumulation, leaf expansion under salt stress.
- Treatment
- supplementation of exogenous GA3 through the MNSe0
- Outcome
- biomass accumulation, leaf expansione0
- Direction
- enhancinge0
Not reportedTaxonComparator
Verbatim
e0“The supplementation of exogenous GA3 through the MNS allowed plants to substantially counterbalance salt stress by enhancing various morphological and physiological traits, such as biomass accumulation, leaf expansion, stomatal conductance and water and nitrogen use efficiency.”
Claim · model-written summary
Exogenous GA3 enhanced stomatal conductance and water and nitrogen use efficiency under salt stress.
- Treatment
- supplementation of exogenous GA3 through the MNSe0
- Outcome
- stomatal conductance and water and nitrogen use efficiencye0
- Direction
- enhancinge0
Not reportedTaxonComparator
Verbatim
e0“The supplementation of exogenous GA3 through the MNS allowed plants to substantially counterbalance salt stress by enhancing various morphological and physiological traits, such as biomass accumulation, leaf expansion, stomatal conductance and water and nitrogen use efficiency.”
Claim · model-written summary
Salt stress and GA3 effects differed by species.
- Outcome
- effects of salt stress and GA3 treatment varied according to the speciese0
Not reportedTaxon
Verbatim
e0“The effects of salt stress and GA3 treatment varied according to the species, thus indicating that this interaction may improve salt tolerance by activating different adaptation systems.”
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