Abstract
Studies on the biodiversity of plants associated microorganisms play an important role in food production. Ficus-tree, Opuntia ficus-indica Mill, are cultivated in many nations worldwide intercropping with other cultures, like cowpea, Vigna unguiculata (L.) Walp. The objectives of this study were to isolate and determine the diversity of bacterial endophytes and rhizobacteria in cacti and their ability to solubilize phosphate, the nif presence, their ability to produce indole-acetic acid (IAA) and verify their efficacy to promote plant growth in cowpea plants. Bacteria were isolated from rhizospheric soils, from surface- sterilized stems and roots of plants collected in Brazil, in nitrogen- free medium, and identified through fatty acid analysis. Gram-negative bacteria comprised 63% of endophytic bacteria and 80% of rhizobacteria. Only 13% showed amplification of nifH gene. From the 68 bacterial strains, associated with cacti, 18% produced IAA, and the best results were observed in Agrobacterium radiobacter, Klebsiella trevisanii, Enterobacter agglomeransand Paracoccus denitrificans. Phosphate solubilization was observed in 6% of strains. None of the strains inoculated in cowpea plants promoted stem and foliar growth. Four percent of strains showed ability to increase the root dry matter compared to the control group (inoculated with a pool of indigenous semi-arid Rhizobium). Key words: Endophytes, rhizosphere, indole-acetic acid (IAA), phosphate solubilization, cacti, Vigna. .
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Claims 8
Claim · model-written summary
Gram-negative bacteria comprised 63% of cactus endophytes.
- Taxon
- Opuntia ficus-indica
_Gaziantep_Turkey.IMG_1104.jpg?width=60)
Opuntia ficus-indicat0 - Outcome
- endophytic bacteriae0
- Value
- 63%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Gaziantep_Turkey.IMG_1104.jpg?width=500)
Verbatim
e0“Gram-negative bacteria comprised 63% of endophytic bacteria”
t0“Opuntia ficus-indica mill”
Claim · model-written summary
Gram-negative bacteria comprised 80% of cactus rhizobacteria.
- Taxon
- Opuntia ficus-indicaOpuntia ficus-indicat0
- Outcome
- rhizobacteriae0
- Value
- 80%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“80% of rhizobacteria”
e1“Gram-negative bacteria comprised”
t0“Opuntia ficus-indica mill”
Claim · model-written summary
Only 13% of cactus-associated bacteria amplified nifH.
- Taxon
- Opuntia ficus-indicaOpuntia ficus-indicat0
- Gene
- nifHe0
- Outcome
- amplification of nifH genee0
- Value
- 13%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Only 13% showed amplification of nifH gene”
t0“Opuntia ficus-indica mill”
Claim · model-written summary
Eighteen percent of cactus-associated strains produced IAA.
- Taxon
- Opuntia ficus-indicaOpuntia ficus-indicat0
- Outcome
- produced IAAe0
- Value
- 18%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“From the 68 bacterial strains, associated with cacti, 18% produced IAA”
t0“Opuntia ficus-indica mill”
Claim · model-written summary
The best IAA production results occurred in four named bacterial taxa.
- Taxon
- Opuntia ficus-indicaOpuntia ficus-indicat0
- Outcome
- produced IAAe1
- Qualifier
- Agrobacterium radiobacter, Klebsiella trevisanii, Enterobacter agglomeransand Paracoccus denitrificanse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the best results were observed in Agrobacterium radiobacter, Klebsiella trevisanii, Enterobacter agglomeransand Paracoccus denitrificans”
e1“produced IAA”
t0“Opuntia ficus-indica mill”
Claim · model-written summary
Six percent of cactus-associated strains solubilized phosphate.
- Taxon
- Opuntia ficus-indicaOpuntia ficus-indicat0
- Outcome
- Phosphate solubilizatione0
- Value
- 6%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phosphate solubilization was observed in 6% of strains”
t0“Opuntia ficus-indica mill”
Claim · model-written summary
None of the inoculated strains promoted cowpea stem or foliage growth.
- Taxon
- cowpea
Vigna unguiculatae0 - Treatment
- strains inoculatede0
- Outcome
- stem and foliar growthe0
- Direction
- Nonee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“None of the strains inoculated in cowpea plants promoted stem and foliar growth”
Claim · model-written summary
Four percent of strains increased cowpea root dry matter relative to the indigenous Rhizobium control.
- Taxon
- cowpeaVigna unguiculatat0
- Organ / stage
- roote0
- Treatment
- strainse0
- Outcome
- root dry mattere0
- Direction
- increasee0
- Value
- Four percente0
- Comparator
- control groupe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Four percent of strains showed ability to increase the root dry matter compared to the control group (inoculated with a pool of indigenous semi-arid Rhizobium)”
t0“cowpea”
The same questions in other papers
inoculation · growth · Vigna unguiculata (cowpea)Positive and negative results
9 papers in the same direction as this paper · 92 in the opposite direction
- positive
- positive
- positive
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See all 102 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.