Abstract
Abstract Greenhouse experiments were conducted to determine the effect of different physical structures of the rooting matrix on root development, rhizobial growth, nodulation and nitrogenase activity in the rhisosphere of Medicago sativa L. and Macroptilium atropurpureum. Eight different soil physical structures were obtained by altering the proportion of sand to vermiculite. Increasing the sand portion in the rooting matrix decreased root dry weight and plant growth by 33% and 25%, respectively. Under these conditions the number of nodules on the taproot of Medicago sativa L. inoculated with Rhizobium meliloti and of Macroptilium atropurpureum inoculated with Bradyrhizobium sp. decreased significantly, with no apparent change in the total number of nodules per plant. Competition studies with low inoculum size (106 c.f.u./mL) of two efficient Bradyrhizobium strains (280A and 2212A at 1:1 ratio) in M. atropurpureum rhizosphere, resulted in a significant reduction in number of nodules induced by strain 280A. This effect was associated with an increase in the sand portion in the rooting matrix and with a reduction of strain 280A growth in the rhizosphere. The number of nodules containing strain 2212A and its population in the rhizosphere remained constant in the differently proportioned sand : vermiculite mixtures. It was concluded that the main effect of rooting matrix composition was on root function, thus affecting rhizobial activity in the rhizosphere and the nodules’ function.
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Claims 11
Claim · model-written summary
Increasing sand reduced root dry weight by 33%.
- Taxon
- Medicago sativa L. and Macroptilium atropurpureum
Medicago sativa
Macroptilium atropurpureume1 - Treatment
- Increasing the sand portione0
- Outcome
- root dry weighte0
- Direction
- decreasede0
- Value
- 33%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing the sand portion in the rooting matrix decreased root dry weight and plant growth by 33% and 25%, respectively.”
e1“Medicago sativa L. and Macroptilium atropurpureum”
Claim · model-written summary
Increasing sand reduced plant growth by 25%.
- Taxon
- Medicago sativa L. and Macroptilium atropurpureumMedicago sativaMacroptilium atropurpureume1
- Treatment
- Increasing the sand portione0
- Outcome
- plant growthe0
- Direction
- decreasede0
- Value
- 25%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing the sand portion in the rooting matrix decreased root dry weight and plant growth by 33% and 25%, respectively.”
e1“Medicago sativa L. and Macroptilium atropurpureum”
Claim · model-written summary
More sand significantly reduced taproot nodule number in Medicago sativa inoculated with Rhizobium meliloti.
- Taxon
- Medicago sativa L.Medicago sativae0
- Treatment
- Increasing the sand portione1
- Interactor
- Rhizobium meliloti
Sinorhizobium melilotie0symbiont - Outcome
- number of nodules on the taproote0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under these conditions the number of nodules on the taproot of Medicago sativa L. inoculated with Rhizobium meliloti and of Macroptilium atropurpureum inoculated with Bradyrhizobium sp. decreased significantly”
e1“Increasing the sand portion in the rooting matrix”
Claim · model-written summary
More sand significantly reduced taproot nodule number in Macroptilium atropurpureum inoculated with Bradyrhizobium sp.
- Taxon
- Macroptilium atropurpureumMacroptilium atropurpureume0
- Treatment
- Increasing the sand portione1
- Interactor
- Bradyrhizobium sp.
Bradyrhizobiume0symbiont - Outcome
- number of nodules on the taproote0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under these conditions the number of nodules on the taproot of Medicago sativa L. inoculated with Rhizobium meliloti and of Macroptilium atropurpureum inoculated with Bradyrhizobium sp. decreased significantly”
e1“Increasing the sand portion in the rooting matrix”
Claim · model-written summary
Total nodule number per plant showed no apparent change under these conditions.
- Taxon
- Medicago sativa L. and Macroptilium atropurpureumMedicago sativaMacroptilium atropurpureume1
- Treatment
- Increasing the sand portione2
- Outcome
- total number of nodules per plante0
- Direction
- no apparent changee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“with no apparent change in the total number of nodules per plant.”
e1“Medicago sativa L. and Macroptilium atropurpureum”
e2“Increasing the sand portion in the rooting matrix”
Claim · model-written summary
With low inoculum, nodule number induced by Bradyrhizobium strain 280A was significantly reduced in M. atropurpureum.
- Taxon
- M. atropurpureumMacroptilium atropurpureume0
- Interactor
- Bradyrhizobium strains (280A and 2212Ae0symbiont
- Outcome
- number of nodules induced by strain 280Ae0
- Direction
- reductione0
- Qualifier
- low inoculum size (106 c.f.u./mL)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Competition studies with low inoculum size (106 c.f.u./mL) of two efficient Bradyrhizobium strains (280A and 2212A at 1:1 ratio) in M. atropurpureum rhizosphere, resulted in a significant reduction in number of nodules induced by strain 280A.”
Claim · model-written summary
The reduction in nodules induced by strain 280A was associated with more sand.
- Taxon
- M. atropurpureumMacroptilium atropurpureume1
- Treatment
- increase in the sand portione0
- Interactor
- strain 280Ae1symbiont
- Outcome
- reduction in number of nodules induced by strain 280Ae1
- Direction
- reductione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This effect was associated with an increase in the sand portion in the rooting matrix and with a reduction of strain 280A growth in the rhizosphere.”
e1“M. atropurpureum rhizosphere, resulted in a significant reduction in number of nodules induced by strain 280A.”
Claim · model-written summary
The reduction in nodules induced by strain 280A was associated with reduced rhizosphere growth of that strain.
- Taxon
- M. atropurpureumMacroptilium atropurpureume1
- Interactor
- strain 280Ae0symbiont
- Outcome
- reduction in number of nodules induced by strain 280Ae1
- Direction
- reductione1
- Qualifier
- reduction of strain 280A growth in the rhizospheree0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“with a reduction of strain 280A growth in the rhizosphere.”
e1“M. atropurpureum rhizosphere, resulted in a significant reduction in number of nodules induced by strain 280A.”
Claim · model-written summary
Nodules containing strain 2212A remained constant across matrix mixtures.
- Taxon
- M. atropurpureumMacroptilium atropurpureume1
- Interactor
- strain 2212Ae0symbiont
- Outcome
- number of nodules containing strain 2212Ae0
- Direction
- remained constante0
- Qualifier
- differently proportioned sand : vermiculite mixturese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The number of nodules containing strain 2212A and its population in the rhizosphere remained constant in the differently proportioned sand : vermiculite mixtures.”
e1“M. atropurpureum rhizosphere”
Claim · model-written summary
The rhizosphere population of strain 2212A remained constant across matrix mixtures.
- Taxon
- M. atropurpureumMacroptilium atropurpureume1
- Interactor
- strain 2212Ae0symbiont
- Outcome
- population in the rhizospheree0
- Direction
- remained constante0
- Qualifier
- differently proportioned sand : vermiculite mixturese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The number of nodules containing strain 2212A and its population in the rhizosphere remained constant in the differently proportioned sand : vermiculite mixtures.”
e1“M. atropurpureum rhizosphere”
Claim · model-written summary
The authors concluded matrix composition mainly affected root function and consequently rhizobial activity and nodule function.
- Taxon
- Medicago sativa L. and Macroptilium atropurpureumMedicago sativaMacroptilium atropurpureume1
- Outcome
- rhizobial activity in the rhizosphere and the nodules’ functione0
- Qualifier
- root functione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It was concluded that the main effect of rooting matrix composition was on root function, thus affecting rhizobial activity in the rhizosphere and the nodules’ function.”
e1“Medicago sativa L. and Macroptilium atropurpureum”
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