Abstract
The effects of water deficit on growth, nodulation, and several physiological and biochemical processes in six symbiotic combinations involving three Moroccan alfalfa (Medicago sativa L.) populations (Tafilalet1, Adis-Tata and Demnate2), an American Moapa variety and two rhizobial strains (RhL9 and RhL10) were studied. The experiment was conducted under greenhouse conditions. Seedlings were separately inoculated with the suspension of two rhizobial strains and grown under two irrigation regimes: 80% of field capacity (optimal irrigation) and 40% of field capacity (water deficit). The water stress was applied for five weeks and the agro-physiological and biochemical parameters related to water deficit tolerance were assessed. The results showed that the water deficit had significantly reduced the height of the plants, the dry biomass and nodulation. This constraint also negatively affected the relative water content of leaves, the membrane permeability, the stomatal conductance, the maximum quantum yield of photosystem II, the time to reach maximum fluorescence, the total chlorophyll content and the total nitrogen content. Comparison among the tested symbiotic combinations showed that their behaviors were significantly different. Under drought, oasis populations Ad and Ta maintained high PS II efficiency, membrane stability, relative water content, chlorophyll and nitrogen content in comparison to the mountain one Dm2 and the American Moapa variety. These parameters were maintained at adequate levels in the plants inoculated with the rhizobial strain RhL9 that showed a tolerance to water deficit conditions.
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Claims 9
Claim · model-written summary
Water deficit significantly reduced plant height and dry biomass.
- Taxon
- Medicago sativa L.
Medicago sativae1 - Treatment
- water deficite0
- Outcome
- height of the plants, the dry biomasse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results showed that the water deficit had significantly reduced the height of the plants, the dry biomass and nodulation”
e1“alfalfa (Medicago sativa L.) populations”
Claim · model-written summary
Water deficit significantly reduced nodulation.
- Taxon
- Medicago sativa L.Medicago sativae1
- Treatment
- water deficite0
- Interactor
- rhizobial strainse2symbiont
- Outcome
- nodulatione0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results showed that the water deficit had significantly reduced the height of the plants, the dry biomass and nodulation”
e1“alfalfa (Medicago sativa L.) populations”
e2“two rhizobial strains (RhL9 and RhL10)”
Claim · model-written summary
Water deficit negatively affected leaf relative water content, membrane permeability and stomatal conductance.
- Taxon
- Medicago sativa L.Medicago sativae2
- Treatment
- water deficite1
- Outcome
- relative water content of leaves, the membrane permeability, the stomatal conductancee0
- Direction
- negatively affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This constraint also negatively affected the relative water content of leaves, the membrane permeability, the stomatal conductance”
e1“the water deficit had significantly reduced the height of the plants”
e2“alfalfa (Medicago sativa L.) populations”
Claim · model-written summary
Water deficit negatively affected maximum photosystem II quantum yield and time to maximum fluorescence.
- Taxon
- Medicago sativa L.Medicago sativae2
- Treatment
- water deficite1
- Outcome
- maximum quantum yield of photosystem II, the time to reach maximum fluorescencee0
- Direction
- negatively affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This constraint also negatively affected the relative water content of leaves, the membrane permeability, the stomatal conductance, the maximum quantum yield of photosystem II, the time to reach maximum fluorescence”
e1“the water deficit had significantly reduced the height of the plants”
e2“alfalfa (Medicago sativa L.) populations”
Claim · model-written summary
Water deficit negatively affected total chlorophyll and nitrogen contents.
- Taxon
- Medicago sativa L.Medicago sativae2
- Treatment
- water deficite1
- Outcome
- total chlorophyll content and the total nitrogen contente0
- Direction
- negatively affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This constraint also negatively affected the relative water content of leaves, the membrane permeability, the stomatal conductance, the maximum quantum yield of photosystem II, the time to reach maximum fluorescence, the total chlorophyll content and the total nitrogen content”
e1“the water deficit had significantly reduced the height of the plants”
e2“alfalfa (Medicago sativa L.) populations”
Claim · model-written summary
Tested alfalfa–rhizobia combinations behaved significantly differently.
- Taxon
- Medicago sativa L.Medicago sativae1
- Interactor
- rhizobial strainse2symbiont
- Outcome
- behaviorse0
- Direction
- differente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Comparison among the tested symbiotic combinations showed that their behaviors were significantly different”
e1“alfalfa (Medicago sativa L.) populations”
e2“two rhizobial strains (RhL9 and RhL10)”
Claim · model-written summary
Under drought, oasis populations Ad and Ta maintained higher PS II efficiency, membrane stability and relative water content than Dm2 and Moapa.
- Taxon
- Medicago sativa L.Medicago sativae1
- Material
- Ad and Tae0
- Treatment
- droughte0
- Outcome
- PS II efficiency, membrane stability, relative water contente0
- Direction
- highe0
- Comparator
- Dm2 and the American Moapa varietye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under drought, oasis populations Ad and Ta maintained high PS II efficiency, membrane stability, relative water content, chlorophyll and nitrogen content in comparison to the mountain one Dm2 and the American Moapa variety”
e1“alfalfa (Medicago sativa L.) populations”
Claim · model-written summary
Under drought, oasis populations Ad and Ta maintained higher chlorophyll and nitrogen content than Dm2 and Moapa.
- Taxon
- Medicago sativa L.Medicago sativae1
- Material
- Ad and Tae0
- Treatment
- droughte0
- Outcome
- chlorophyll and nitrogen contente0
- Direction
- highe0
- Comparator
- Dm2 and the American Moapa varietye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under drought, oasis populations Ad and Ta maintained high PS II efficiency, membrane stability, relative water content, chlorophyll and nitrogen content in comparison to the mountain one Dm2 and the American Moapa variety”
e1“alfalfa (Medicago sativa L.) populations”
Claim · model-written summary
Plants inoculated with RhL9 maintained adequate drought-related physiological parameters.
- Taxon
- Medicago sativa L.Medicago sativae1
- Treatment
- inoculated with the rhizobial strain RhL9e0
- Interactor
- RhL9e0symbiont
- Outcome
- These parameters were maintained at adequate levelse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These parameters were maintained at adequate levels in the plants inoculated with the rhizobial strain RhL9 that showed a tolerance to water deficit conditions”
e1“alfalfa (Medicago sativa L.) populations”
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