Abstract
Acidic conditions with damaging levels of available aluminium (Al3+) currently limit lucerne (Medicago sativa) production on soils in the New Zealand high country and in large areas of Australia. Increased lucerne nodulation could be achieved by using an Al3+-tolerant strain of Sinorhizobium meliloti to inoculate an Al3+-tolerant lucerne line. The Al3+ tolerance of the current commercial Australasian inoculant strain for lucerne, S. meliloti RRI128, was compared with strain SRDI736, selected in Australia for tolerance to low pH. Four Al3+ levels (0, 2, 4 and 8 µm) were created at pH 5.1 in a hydroponic system. The rhizobial strains were evaluated on SARDI AT7, a lucerne line selected for improved growth and nodulation in acidic solution culture with Al3+, and on Stamina 5, a commercial cultivar commonly grown in Australasia. SARDI AT7 when inoculated with strain SRDI736 produced more nodules per plant (3.6 vs 2.4) and had higher nodulation percentage (>80% vs <50%) at all Al3+ levels than when inoculated with RRI128. The percentage of nodulated Stamina 5 plants after inoculation with the commercial strain was lower than after inoculation with strain SRDI736 (10–16% vs 25–70%) at all Al3+ levels. The potential of S. meliloti strains SRDI736, SRDI672 and RRI128 and rates of lime to increase lucerne nodulation and dry matter production in soils of low pH (<5.5, in water) and high Al3+ (>3 mg kg–1 soil) was also investigated in a pot trial. Lime had a more consistent effect than inoculant strain for increasing nodulation. At 0.5 and 2 t lime ha–1, plants inoculated with strains SRDI672 and SRDI736 had more nodules per plant than plants inoculated with the commercial strain. At 4 t lime ha–1, the number of nodules per plant was highest for all three inoculants, and there were no differences among them. This confirms the importance of lime to increase lucerne nodulation in low-pH, high-Al3+ soils. However, where liming is uneconomic or impractical, the results show that it was possible to select rhizobial strains to increase lucerne nodulation in acidic soils with damaging levels of available Al3+.
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Claims 9
Claim · model-written summary
SRDI736 produced more nodules on SARDI AT7 than RRI128 at all aluminium levels.
- Taxon
- lucerne
Medicago sativat0 - Material
- SARDI AT7e0
- Treatment
- inoculated with strain SRDI736e0
- Interactor
- Sinorhizobium meliloti
Sinorhizobium melilotie1symbiont - Outcome
- nodules per plante0
- Direction
- moree0
- Value
- 3.6 vs 2.4e0
- Qualifier
- at all Al3+ levelse0
- Comparator
- inoculated with RRI128e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“SARDI AT7 when inoculated with strain SRDI736 produced more nodules per plant (3.6 vs 2.4) and had higher nodulation percentage (>80% vs <50%) at all Al3+ levels than when inoculated with RRI128.”
t0“Increased lucerne nodulation in acid soils with Sinorhizobium meliloti and lucerne tolerant to low pH and high aluminium”
e1“Sinorhizobium meliloti”
Claim · model-written summary
SRDI736 produced a higher nodulation percentage on SARDI AT7 than RRI128.
- Taxon
- lucerneMedicago sativat0
- Material
- SARDI AT7e0
- Treatment
- inoculated with strain SRDI736e0
- Interactor
- Sinorhizobium melilotiSinorhizobium melilotie1symbiont
- Outcome
- nodulation percentagee0
- Direction
- highere0
- Value
- >80% vs <50%e0
- Qualifier
- at all Al3+ levelse0
- Comparator
- inoculated with RRI128e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“SARDI AT7 when inoculated with strain SRDI736 produced more nodules per plant (3.6 vs 2.4) and had higher nodulation percentage (>80% vs <50%) at all Al3+ levels than when inoculated with RRI128.”
t0“Increased lucerne nodulation in acid soils with Sinorhizobium meliloti and lucerne tolerant to low pH and high aluminium”
e1“Sinorhizobium meliloti”
Claim · model-written summary
SRDI736 yielded a higher nodulated percentage of Stamina 5 than the commercial strain.
- Taxon
- lucerneMedicago sativat0
- Material
- Stamina 5e0
- Treatment
- inoculation with strain SRDI736e0
- Interactor
- Sinorhizobium melilotiSinorhizobium melilotie1symbiont
- Outcome
- percentage of nodulated Stamina 5 plantse0
- Direction
- lowere0
- Value
- 10–16% vs 25–70%e0
- Comparator
- inoculation with the commercial straine0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The percentage of nodulated Stamina 5 plants after inoculation with the commercial strain was lower than after inoculation with strain SRDI736 (10–16% vs 25–70%) at all Al3+ levels.”
t0“Increased lucerne nodulation in acid soils with Sinorhizobium meliloti and lucerne tolerant to low pH and high aluminium”
e1“Sinorhizobium meliloti”
Claim · model-written summary
Lime increased lucerne nodulation more consistently than inoculant strain.
- Taxon
- lucerneMedicago sativat0
- Treatment
- Limee0
- Outcome
- nodulatione0
- Direction
- increasinge0
- Comparator
- inoculant straine0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lime had a more consistent effect than inoculant strain for increasing nodulation.”
t0“Increased lucerne nodulation in acid soils with Sinorhizobium meliloti and lucerne tolerant to low pH and high aluminium”
Claim · model-written summary
At 0.5 t lime per hectare, SRDI672 gave more lucerne nodules than the commercial strain.
- Taxon
- lucerneMedicago sativat0
- Treatment
- strains SRDI672e0
- Interactor
- Sinorhizobium melilotiSinorhizobium melilotie1symbiont
- Outcome
- nodules per plante0
- Direction
- moree0
- Qualifier
- At 0.5 and 2 t lime ha–1e0
- Comparator
- commercial straine0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At 0.5 and 2 t lime ha–1, plants inoculated with strains SRDI672 and SRDI736 had more nodules per plant than plants inoculated with the commercial strain.”
t0“Increased lucerne nodulation in acid soils with Sinorhizobium meliloti and lucerne tolerant to low pH and high aluminium”
e1“Sinorhizobium meliloti”
Claim · model-written summary
At 0.5 and 2 t lime per hectare, SRDI736 gave more lucerne nodules than the commercial strain.
- Taxon
- lucerneMedicago sativat0
- Treatment
- SRDI736e0
- Interactor
- Sinorhizobium melilotiSinorhizobium melilotie1symbiont
- Outcome
- nodules per plante0
- Direction
- moree0
- Qualifier
- At 0.5 and 2 t lime ha–1e0
- Comparator
- commercial straine0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At 0.5 and 2 t lime ha–1, plants inoculated with strains SRDI672 and SRDI736 had more nodules per plant than plants inoculated with the commercial strain.”
t0“Increased lucerne nodulation in acid soils with Sinorhizobium meliloti and lucerne tolerant to low pH and high aluminium”
e1“Sinorhizobium meliloti”
Claim · model-written summary
At 4 t lime per hectare, nodules per plant were highest for all three inoculants.
- Taxon
- lucerneMedicago sativat0
- Treatment
- 4 t lime ha–1e0
- Outcome
- number of nodules per plante0
- Direction
- higheste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At 4 t lime ha–1, the number of nodules per plant was highest for all three inoculants”
t0“Increased lucerne nodulation in acid soils with Sinorhizobium meliloti and lucerne tolerant to low pH and high aluminium”
Claim · model-written summary
At 4 t lime per hectare, nodulation did not differ among inoculants.
- Taxon
- lucerneMedicago sativat0
- Treatment
- 4 t lime ha–1e0
- Outcome
- number of nodules per plante0
- Direction
- no differencese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At 4 t lime ha–1, the number of nodules per plant was highest for all three inoculants, and there were no differences among them.”
t0“Increased lucerne nodulation in acid soils with Sinorhizobium meliloti and lucerne tolerant to low pH and high aluminium”
Claim · model-written summary
The authors concluded that selecting rhizobial strains can increase lucerne nodulation where liming is impractical.
- Taxon
- lucerneMedicago sativae0
- Outcome
- select rhizobial strains to increase lucerne nodulatione0
- Qualifier
- where liming is uneconomic or impracticale0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“where liming is uneconomic or impractical, the results show that it was possible to select rhizobial strains to increase lucerne nodulation in acidic soils with damaging levels of available Al3+.”
The same questions in other papers
lime · symbiosis · Medicago sativa (alfalfa)Positive and negative results
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- positive
- negative
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29 papers in the same direction as this paper · 7 in the opposite direction
- no effect
- negative
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See all 37 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.