Abstract
Experiments were conducted to investigate the possibility that rhizobacterial nodulation in legumes influences parasitic attack by broomrape. Small broomrape (Orobanche minor), which is commonly associated with swellings of the host root, was studied on red clover (Trifolium pratense) in the presence or absence of Rhizobium leguminosarum bv. trifolii inoculum and was compared to Egyptian broomrape (Orobanche aegyptiaca), which is not associated with host root swellings. Small broomrape showed greater percent seed germination and formed a greater number of attachments on red clover inoculated with rhizobacteria in comparison with noninoculated plants. In contrast, inoculum did not appear to enhance Egyptian broomrape seed germination or the number of its attachments on the host roots compared to noninoculated controls. In aseptic culture, the addition of Rhizobium increased the success of small broomrape in parasitizing clover but was not essential for parasitization. No rhizobacteria were detected in cultures derived from tubercles under septic or aseptic conditions. Morphological observations of small broomrape attachments on red clover suggest that parasitic attachments were not situated over the bacterial nodules but may involve parasite-induced protrusion of host plant root cortex. These results indicate that although rhizobacterial nodulation is not required for parasitization, the presence of nodules facilitates small broomrape germination and attachment to red clover.Nomenclature: Egyptian broomrape, Orobanche aegyptiaca Pers. #3 ORAAE; small broomrape, Orobanche minor Sm. # ORAMI; red clover, Trifolium pratense L. # TRFPR; inoculum culture, Rhizobium leguminosarum bv. trifolii.Additional index words: Parasitic weeds, nodulation, rhizobacteria, ORAAE, ORAMI.Abbreviations: DAT, days after transplanting; GFFP, glass fiber filter paper; PE, polyethylene; YMB, yeast–mannitol broth.
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Claims 9
Claim · model-written summary
Rhizobacterial inoculation increased small broomrape seed germination on red clover.
- Taxon
- red clover
Trifolium pratensee0 - Treatment
- inoculated with rhizobacteriae0
- Interactor
- Small broomrapee0parasite
- Second interactor
- Rhizobium leguminosarum bv. trifoliiRhizobium leguminosarum bv. trifoliie1symbiont
- Outcome
- Small broomrape showed greater percent seed germinatione0
- Direction
- greatere0
- Comparator
- noninoculated plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Small broomrape showed greater percent seed germination and formed a greater number of attachments on red clover inoculated with rhizobacteria in comparison with noninoculated plants”
e1“Rhizobium leguminosarum bv. trifolii inoculum”
Claim · model-written summary
Rhizobacterial inoculation increased small broomrape attachments on red clover.
- Taxon
- red cloverTrifolium pratensee0
- Treatment
- inoculated with rhizobacteriae0
- Interactor
- Small broomrapee0parasite
- Second interactor
- Rhizobium leguminosarum bv. trifoliiRhizobium leguminosarum bv. trifoliie1symbiont
- Outcome
- number of attachmentse0
- Direction
- greatere0
- Comparator
- noninoculated plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Small broomrape showed greater percent seed germination and formed a greater number of attachments on red clover inoculated with rhizobacteria in comparison with noninoculated plants”
e1“Rhizobium leguminosarum bv. trifolii inoculum”
Claim · model-written summary
Rhizobacterial inoculation did not appear to enhance Egyptian broomrape germination.
- Taxon
- red cloverTrifolium pratensee1
- Treatment
- inoculume0
- Interactor
- Egyptian broomrapee0parasite
- Second interactor
- Rhizobium leguminosarum bv. trifoliiRhizobium leguminosarum bv. trifoliie2symbiont
- Outcome
- Egyptian broomrape seed germinatione0
- Direction
- did not appear to enhancee0
- Comparator
- noninoculated controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“inoculum did not appear to enhance Egyptian broomrape seed germination or the number of its attachments on the host roots compared to noninoculated controls”
e1“red clover (Trifolium pratense)”
e2“Rhizobium leguminosarum bv. trifolii inoculum”
Claim · model-written summary
Rhizobacterial inoculation did not appear to enhance Egyptian broomrape attachments.
- Taxon
- red cloverTrifolium pratensee1
- Treatment
- inoculume0
- Interactor
- Egyptian broomrapee0parasite
- Second interactor
- Rhizobium leguminosarum bv. trifoliiRhizobium leguminosarum bv. trifoliie2symbiont
- Outcome
- number of its attachments on the host rootse0
- Direction
- did not appear to enhancee0
- Comparator
- noninoculated controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“inoculum did not appear to enhance Egyptian broomrape seed germination or the number of its attachments on the host roots compared to noninoculated controls”
e1“red clover (Trifolium pratense)”
e2“Rhizobium leguminosarum bv. trifolii inoculum”
Claim · model-written summary
In aseptic culture, Rhizobium increased small broomrape parasitization success on clover.
- Treatment
- addition of Rhizobiume0
- Interactor
- small broomrapee0parasite
- Outcome
- success of small broomrape in parasitizing clovere0
- Direction
- increasede0
- Setting
- aseptic culturee0
Trifolium
RhizobiumNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In aseptic culture, the addition of Rhizobium increased the success of small broomrape in parasitizing clover”
Claim · model-written summary
Rhizobium was not essential for small broomrape parasitization in aseptic culture.
- Interactor
- small broomrapee0parasite
- Outcome
- not essential for parasitizatione0
- Setting
- aseptic culturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In aseptic culture, the addition of Rhizobium increased the success of small broomrape in parasitizing clover but was not essential for parasitization”
Claim · model-written summary
No rhizobacteria were detected in cultures derived from tubercles.
- Taxon
- red cloverTrifolium pratensee1
- Organ / stage
- tuberclese0
- Interactor
- rhizobacteriaHyphomicrobialese0symbiont
- Outcome
- No rhizobacteria were detectede0
- Setting
- septic or aseptic conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No rhizobacteria were detected in cultures derived from tubercles under septic or aseptic conditions”
e1“red clover (Trifolium pratense)”
Claim · model-written summary
Small broomrape attachments were apparently not situated over bacterial nodules.
- Taxon
- red cloverTrifolium pratensee1
- Interactor
- small broomrapee1parasite
- Outcome
- parasitic attachments were not situated over the bacterial nodulese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“parasitic attachments were not situated over the bacterial nodules”
e1“small broomrape attachments on red clover”
Claim · model-written summary
Small broomrape attachments may involve protrusion of the host root cortex.
- Taxon
- red cloverTrifolium pratensee1
- Organ / stage
- root cortexe0
- Interactor
- small broomrapee1parasite
- Outcome
- parasite-induced protrusion of host plant root cortexe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“may involve parasite-induced protrusion of host plant root cortex”
e1“small broomrape attachments on red clover”
The same questions in other papers
inoculation · growth · Trifolium pratense (red clover)Positive and negative results
1 paper in the same direction as this paper · 16 in the opposite direction
- positive
- positive
- positive
14 papers more in this group
See all 18 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.