Abstract
We have isolated and characterized the extracellular Nod factors of Rhizobium fredii USDA257, a nitrogen-fixing symbiont of soybean [Glycine max (L.) Merr.] and several other legume species. These signals are produced upon exposure to the isoflavone genistein and consist of a series of substituted, beta 1,4-linked tri-, tetra-, and pentamers of N-acetylglucosamine. N-Vaccenic acid replaces acetate on the nonreducing residue, and the reducing residue contains alpha-linked 2-O-methylfucose on carbon 6. Small amounts of a fucose-containing tetramer also were present. The Nod factors elicit root-hair deformations on soybean and two other plants at concentrations ranging from 10(-6) to 10(-12) M.
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Claims 5
Claim · model-written summary
Genistein exposure induced production of substituted N-acetylglucosamine Nod factors.
- Taxon
- soybean
Glycine maxe1 - Treatment
- genisteine0
- Outcome
- substituted, beta 1,4-linked tri-, tetra-, and pentamers of N-acetylglucosaminee0
Not reportedInteractor
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These signals are produced upon exposure to the isoflavone genistein and consist of a series of substituted, beta 1,4-linked tri-, tetra-, and pentamers of N-acetylglucosamine”
e1“a nitrogen-fixing symbiont of soybean [Glycine max (L.) Merr.]”
Claim · model-written summary
N-Vaccenic acid replaces acetate on the nonreducing residue.
- Taxon
- soybeanGlycine maxe1
- Outcome
- N-Vaccenic acid replaces acetate on the nonreducing residuee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N-Vaccenic acid replaces acetate on the nonreducing residue”
e1“symbiont of soybean”
Claim · model-written summary
The reducing residue contains alpha-linked 2-O-methylfucose on carbon 6.
- Taxon
- soybeanGlycine maxe1
- Outcome
- alpha-linked 2-O-methylfucose on carbon 6e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the reducing residue contains alpha-linked 2-O-methylfucose on carbon 6”
e1“symbiont of soybean”
Claim · model-written summary
A fucose-containing tetramer was present in small amounts.
- Taxon
- soybeanGlycine maxe1
- Outcome
- fucose-containing tetramere0
- Qualifier
- Small amountse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Small amounts of a fucose-containing tetramer also were present”
e1“symbiont of soybean”
Claim · model-written summary
The Nod factors elicited soybean root-hair deformation at 10(-6) to 10(-12) M.
- Taxon
- soybeanGlycine maxe0
- Treatment
- Nod factorse0
- Outcome
- root-hair deformationse0
- Value
- 10(-6) to 10(-12) Me0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The Nod factors elicit root-hair deformations on soybean and two other plants at concentrations ranging from 10(-6) to 10(-12) M”
The same questions in other papers
nodulation factor · growth · Glycine max (soybean)Results agree
3 papers in the same direction as this paper
- positive
- positive
- positive
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.