Abstract
Alfalfa and its acid-tolerant rhizobium strain 91522 were used as materials in a water culture experiment to study the effects of calcium and phosphorus on the growth and nodulation of the alfalfa-rhizobium system under acidity and aluminum stresses.The research showed that 5 mmol/L Ca2+ significantly improved the growth and survival of rhizobium compared with the control and that under the same Ca2+ level the addition of 4 μmol/L P further enhanced rhizobium survival rate.By combining Ca2+ and P,the elongation of alfalfa primary root was raised by 5-7 times over that of the control under the acidity + aluminum stress condition.When Ca2+ and P were added in combination,the nodular number,nodule fresh weight,time of nodule occurrence and agronomic traits of alfalfa were satisfactorily recovered.Compared with the treatment 5 mmol/L Ca2+,10 mmol/L Ca2+ had better effect of improving nodule growth of alfalfa but poorer effect on nodulation.It was tentatively concluded that Ca2+ and P could recover the symbiosis nodular process after alfalfa suffered from acidity and Al toxicity,by improving rhizobium survival and root growth and by participating in the identification process between the legume host and its rhizobium strain.
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Claims 8
Claim · model-written summary
5 mmol/L Ca2+ improved rhizobium growth and survival relative to control.
- Taxon
- Alfalfa
Medicago sativae0 - Treatment
- 5 mmol/L Ca2+e1
- Outcome
- growth and survival of rhizobiume1
- Direction
- improvede1
- Comparator
- controle1
RhizobiumOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Alfalfa and its acid-tolerant rhizobium strain 91522”
e1“5 mmol/L Ca2+ significantly improved the growth and survival of rhizobium compared with the control”
Claim · model-written summary
Adding 4 μmol/L P improved rhizobium survival at the same Ca2+ level.
- Taxon
- AlfalfaMedicago sativae0
- Treatment
- addition of 4 μmol/L Pe1
- Outcome
- rhizobium survival ratee1
- Direction
- enhancede1
- Comparator
- same Ca2+ levele1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Alfalfa and its acid-tolerant rhizobium strain 91522”
e1“under the same Ca2+ level the addition of 4 μmol/L P further enhanced rhizobium survival rate”
Claim · model-written summary
Combined Ca2+ and P raised primary-root elongation 5-7 times over control under acid and aluminum stress.
- Taxon
- alfalfaMedicago sativae1
- Treatment
- combining Ca2+ and Pe1
- Outcome
- elongation of alfalfa primary roote1
- Direction
- raisede1
- Value
- 5-7 timese1
- Qualifier
- acidity + aluminum stress conditione1
- Comparator
- controle1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Alfalfa and its acid-tolerant rhizobium strain 91522”
e1“By combining Ca2+ and P,the elongation of alfalfa primary root was raised by 5-7 times over that of the control under the acidity + aluminum stress condition.”
Claim · model-written summary
Combined Ca2+ and P recovered nodule number and fresh weight.
- Taxon
- alfalfaMedicago sativae1
- Treatment
- Ca2+ and P were added in combinatione1
- Outcome
- nodular number,nodule fresh weighte1
- Direction
- recoverede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Alfalfa and its acid-tolerant rhizobium strain 91522”
e1“When Ca2+ and P were added in combination,the nodular number,nodule fresh weight,time of nodule occurrence and agronomic traits of alfalfa were satisfactorily recovered.”
Claim · model-written summary
Combined Ca2+ and P recovered nodule occurrence timing and agronomic traits.
- Taxon
- alfalfaMedicago sativae1
- Treatment
- Ca2+ and P were added in combinatione1
- Outcome
- time of nodule occurrence and agronomic traitse1
- Direction
- recoverede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Alfalfa and its acid-tolerant rhizobium strain 91522”
e1“When Ca2+ and P were added in combination,the nodular number,nodule fresh weight,time of nodule occurrence and agronomic traits of alfalfa were satisfactorily recovered.”
Claim · model-written summary
10 mmol/L Ca2+ improved nodule growth more than 5 mmol/L Ca2+.
- Taxon
- alfalfaMedicago sativae1
- Treatment
- 10 mmol/L Ca2+e1
- Outcome
- nodule growth of alfalfae1
- Direction
- bettere1
- Comparator
- 5 mmol/L Ca2+e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Alfalfa and its acid-tolerant rhizobium strain 91522”
e1“Compared with the treatment 5 mmol/L Ca2+,10 mmol/L Ca2+ had better effect of improving nodule growth of alfalfa but poorer effect on nodulation.”
Claim · model-written summary
10 mmol/L Ca2+ performed worse for nodulation than 5 mmol/L Ca2+.
- Taxon
- alfalfaMedicago sativae1
- Treatment
- 10 mmol/L Ca2+e1
- Outcome
- nodulatione1
- Direction
- poorere1
- Comparator
- 5 mmol/L Ca2+e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Alfalfa and its acid-tolerant rhizobium strain 91522”
e1“Compared with the treatment 5 mmol/L Ca2+,10 mmol/L Ca2+ had better effect of improving nodule growth of alfalfa but poorer effect on nodulation.”
Claim · model-written summary
Authors tentatively attributed recovery of symbiotic nodulation to improved rhizobium survival and root growth and host recognition.
- Taxon
- alfalfaMedicago sativae0
- Treatment
- Ca2+ and Pe0
- Outcome
- symbiosis nodular processe0
- Qualifier
- by improving rhizobium survival and root growth and by participating in the identification processe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It was tentatively concluded that Ca2+ and P could recover the symbiosis nodular process after alfalfa suffered from acidity and Al toxicity,by improving rhizobium survival and root growth and by participating in the identification process between the legume host and its rhizobium strain.”
The same questions in other papers
calcium(2+) · growth · Medicago sativa (alfalfa)Results agree
4 papers in the same direction as this paper
- positive
- positive
- positive
1 paper more in this group
See all 5 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.