Abstract
SUMMARY Ten endophytic bacteria were isolated from different sugarcane varieties growing in the Crop Research Centre, Pantnagar on nitrogen-free medium. Plant growth-promoting potential of the isolates was reported in terms of indole acetic acid (IAA) production, phosphorus solubilization, siderophore production and antagonistic action against the pathogen Colletotrichum falcatum , which causes red rot disease in sugarcane in vitro . All the isolates were able to produce IAA (4.8–9 μg ml −1 ); three isolates (H3, H5 and H14) solubilized insoluble phosphorus on Pikovaskaya's agar; two isolates (H10 and H14) showed siderophore production on Chrome-azurol S (CAS) agar and antagonism against C. falcatum was exhibited by two isolates (H14 and H15) in a dual plate assay. 16 S rRNA sequencing identified isolates H3 and H12 as Pseudomonas spp., and H8, H14 and H15 as Bacillus spp. A field experiment on sugarcane was conducted with five plant growth-promoting bacterial endophytes Pseudomonas spp. (H3 and H12) and Bacillus spp. (H8, H14 and H15) along with standard strains of Gluconacetobacter and Azospirillum spp. Plant height, chlorophyll content, total nitrogen and cane length were significantly higher in almost all inoculated plants compared with the uninoculated control. An increase of 40% in cane yield over the control was obtained after inoculation with isolate H15 ( Bacillus spp.). This was statistically on par with the standard endophyte Gluconacetobacter diazotrophicus , which resulted in 42% increased cane yield. Identification of new diazotrophs and their promising results towards improving plant growth in the field suggest their use as inoculants in future.
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Claims 11
Claim · model-written summary
All isolates produced IAA at 4.8–9 μg ml −1.
Verbatim
e0“All the isolates were able to produce IAA (4.8–9 μg ml −1 )”
t0“SUGARCANE”
Claim · model-written summary
H3, H5 and H14 solubilized insoluble phosphorus.
Verbatim
e0“three isolates (H3, H5 and H14) solubilized insoluble phosphorus”
t0“SUGARCANE”
Claim · model-written summary
H10 and H14 produced siderophores.
Verbatim
e0“two isolates (H10 and H14) showed siderophore production”
t0“SUGARCANE”
Claim · model-written summary
H14 and H15 antagonized C. falcatum in a dual plate assay.
- Taxon
- sugarcanet0
- Material
- H14 and H15e0
- Interactor
- C. falcatumColletotrichum falcatume0pathogen
- Outcome
- antagonism against C. falcatume0
Verbatim
e0“antagonism against C. falcatum was exhibited by two isolates (H14 and H15) in a dual plate assay”
t0“SUGARCANE”
Claim · model-written summary
H3 and H12 were identified as Pseudomonas spp.
Verbatim
e0“16 S rRNA sequencing identified isolates H3 and H12 as Pseudomonas spp.”
t0“SUGARCANE”
Claim · model-written summary
H8, H14 and H15 were identified as Bacillus spp.
Verbatim
e0“H8, H14 and H15 as Bacillus spp.”
t0“SUGARCANE”
Claim · model-written summary
Inoculated plants had significantly greater plant height, chlorophyll content and total nitrogen.
Verbatim
e0“Plant height, chlorophyll content, total nitrogen and cane length were significantly higher in almost all inoculated plants compared with the uninoculated control”
t0“SUGARCANE”
Claim · model-written summary
Inoculated plants had significantly greater cane length.
Verbatim
e0“Plant height, chlorophyll content, total nitrogen and cane length were significantly higher in almost all inoculated plants compared with the uninoculated control”
t0“SUGARCANE”
Claim · model-written summary
H15 inoculation increased cane yield by 40% over control.
Verbatim
e0“An increase of 40% in cane yield over the control was obtained after inoculation with isolate H15 ( Bacillus spp.)”
t0“SUGARCANE”
Claim · model-written summary
Gluconacetobacter diazotrophicus increased cane yield by 42%.
- Taxon
- sugarcanet0
- Treatment
- Gluconacetobacter diazotrophicuse0
- Interactor
- Gluconacetobacter diazotrophicusGluconacetobacter diazotrophicuse0symbiont
- Outcome
- cane yielde0
- Direction
- increasede0
- Value
- 42%e0
Not reportedComparator
Verbatim
e0“Gluconacetobacter diazotrophicus , which resulted in 42% increased cane yield”
t0“SUGARCANE”
Claim · model-written summary
The authors suggest using the newly identified diazotrophs as inoculants.
Verbatim
e0“suggest their use as inoculants in future”
t0“SUGARCANE”
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See all 50 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.