Abstract
Pseudomonas fluorescens 6-8, a rhizosphere isolate previously shown to enhance root elongation of canola ( Brassica napus L.), was characterized for its ability to produce indole-3-acetic acid and cytokinins in pure culture and in the rhizosphere of canola under gnotobiotic conditions in comparison with the cytokinin-producing strain P. fluorescens G20-18 and its mutant CNT2. Strain 6-8 produced isopentenyl adenosine, zeatin riboside, and dihydroxyzeatin riboside at levels similar to those of G20-18, but only very low concentrations of indole-3-acetic acid. In a gnotobiotic assay canola inoculated with 6-8 and G20-18 had higher concentrations of isopentenyl adenosine and zeatin riboside in the rhizosphere and greater root length than the noninoculated control. The ability of strain 6-8 to colonize canola roots was assessed following transformation with the green fluorescent protein and inoculation onto canola seed in a gnotobiotic assay. Higher populations of strain 6-8 were observed on the proximal region of the root closest to the seed than on the mid and distal portions 9 days after seed inoculation. The ability of P. fluorescens 6-8 to produce cytokinins, colonize the roots of canola seedlings, and enhance root elongation may contribute to its ability to survive in the rhizosphere and may benefit seedling growth.
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Claims 7
Claim · model-written summary
Strain 6-8 produced three cytokinins at levels similar to G20-18.
- Taxon
- canola
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Brassica napus var. napust0 - Interactor
- Pseudomonas fluorescens 6-8
.JPG?width=60)
Pseudomonas fluorescenst0symbiont - Outcome
- isopentenyl adenosine, zeatin riboside, and dihydroxyzeatin ribosidee0
- Comparator
- G20-18e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
.JPG?width=500)
Verbatim
e0“Strain 6-8 produced isopentenyl adenosine, zeatin riboside, and dihydroxyzeatin riboside at levels similar to those of G20-18”
t0“Phytohormone production and colonization of canola (Brassica napusL.) roots byPseudomonas fluorescens6-8 under gnotobiotic conditions”
Claim · model-written summary
Strain 6-8 produced very low indole-3-acetic acid concentrations.
- Taxon
- canolaBrassica napus var. napust0
- Interactor
- Pseudomonas fluorescens 6-8Pseudomonas fluorescenst0symbiont
- Outcome
- concentrations of indole-3-acetic acide0
- Direction
- very lowe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but only very low concentrations of indole-3-acetic acid”
t0“Phytohormone production and colonization of canola (Brassica napusL.) roots byPseudomonas fluorescens6-8 under gnotobiotic conditions”
Claim · model-written summary
Inoculation with 6-8 increased rhizosphere isopentenyl adenosine and zeatin riboside against noninoculated canola.
- Taxon
- canolaBrassica napus var. napuse0
- Treatment
- inoculated with 6-8e0
- Interactor
- 6-8e0symbiont
- Outcome
- concentrations of isopentenyl adenosine and zeatin riboside in the rhizospheree0
- Direction
- highere0
- Comparator
- noninoculated controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“canola inoculated with 6-8 and G20-18 had higher concentrations of isopentenyl adenosine and zeatin riboside in the rhizosphere and greater root length than the noninoculated control”
Claim · model-written summary
Inoculation with G20-18 increased rhizosphere isopentenyl adenosine and zeatin riboside.
- Taxon
- canolaBrassica napus var. napuse0
- Treatment
- inoculated with 6-8 and G20-18e0
- Interactor
- G20-18e0symbiont
- Outcome
- concentrations of isopentenyl adenosine and zeatin riboside in the rhizospheree0
- Direction
- highere0
- Comparator
- noninoculated controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“canola inoculated with 6-8 and G20-18 had higher concentrations of isopentenyl adenosine and zeatin riboside in the rhizosphere and greater root length than the noninoculated control”
Claim · model-written summary
Inoculation with 6-8 increased canola root length.
- Taxon
- canolaBrassica napus var. napuse0
- Treatment
- inoculated with 6-8e0
- Interactor
- 6-8e0symbiont
- Outcome
- root lengthe0
- Direction
- greatere0
- Comparator
- noninoculated controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“canola inoculated with 6-8 and G20-18 had higher concentrations of isopentenyl adenosine and zeatin riboside in the rhizosphere and greater root length than the noninoculated control”
Claim · model-written summary
Inoculation with G20-18 increased canola root length.
- Taxon
- canolaBrassica napus var. napuse0
- Treatment
- inoculated with 6-8 and G20-18e0
- Interactor
- G20-18e0symbiont
- Outcome
- root lengthe0
- Direction
- greatere0
- Comparator
- noninoculated controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“canola inoculated with 6-8 and G20-18 had higher concentrations of isopentenyl adenosine and zeatin riboside in the rhizosphere and greater root length than the noninoculated control”
Claim · model-written summary
Strain 6-8 populations were higher on proximal than middle and distal roots.
- Taxon
- canolaBrassica napus var. napust0
- Organ / stage
- proximal region of the roote0
- Interactor
- strain 6-8e0symbiont
- Outcome
- populations of strain 6-8e0
- Direction
- Highere0
- Comparator
- mid and distal portionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Higher populations of strain 6-8 were observed on the proximal region of the root closest to the seed than on the mid and distal portions 9 days after seed inoculation”
t0“canola”
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See all 74 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.