Abstract
The search for diverse plant growth-promoting (PGP) diazotrophic bacteria is gaining momentum as efforts are made to exploit them as biofertilizers for various economically important crops. In the present study, 17 diazotrophic strains belonging to eight different genera isolated from rice paddy fields were screened for multiple PGP traits and evaluated for their inoculation effects on canola and rice plants. All of the strains tested positive for 1- aminocyclopropane-1-carboxylate (ACC) deaminase activity and production of indole 3-acetic acid (IAA) and ammonia (NH3). Additionally, four of the strains were able to solubilize phosphorus (P), five tested positive for zinc (Zn) solubilization and sulfur (S) oxidation, and eight strains produced siderophores. Based on the presence of multiple PGP traits, 10 strains were selected for inoculation studies. Treatment with Herbaspirillum sp. RFNB26 resulted in maximum root length (54.3%), seedling vigor, and dry biomass in canola, whereas Paenibacillus sp. RFNB4 exhibited the lowest activity under gnotobiotic conditions. However, under pot culture conditions, Paenibacillus sp. RFNB4 significantly increased plant height and dry biomass production by 42.3% and 29.5%, respectively. Canola plants and rhizosphere soils inoculated with Bacillus sp. RFNB6 exhibited significantly higher nitrogenase activity. In greenhouse experiments, Serratia sp. RFNB18 increased rice plant height by 35.1%, Xanthomonas sp. RFNB24 enhanced biomass production by 84.6%, and rice rhizosphere soils inoculated with Herbaspirillum sp. RFNB26 exhibited the highest nitrogenase activity. Our findings indicate that most of the selected strains possess multiple PGP properties that significantly improve the growth parameters of the two plants when tested under controlled conditions.
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Claims 9
Claim · model-written summary
Herbaspirillum sp. RFNB26 produced maximum canola root length, rising 54.3% under gnotobiotic conditions.
- Taxon
- canola
.jpg?width=60)
Brassica napus var. napuse0 - Treatment
- Treatment with Herbaspirillum sp. RFNB26e0
- Interactor
- Herbaspirillum sp. RFNB26e0symbiont
- Outcome
- root lengthe0
- Direction
- maximume0
- Value
- 54.3%e0
- Setting
- under gnotobiotic conditionse1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Treatment with Herbaspirillum sp. RFNB26 resulted in maximum root length (54.3%), seedling vigor, and dry biomass in canola”
e1“under gnotobiotic conditions”
Claim · model-written summary
Herbaspirillum sp. RFNB26 gave maximum canola seedling vigor and dry biomass.
- Taxon
- canolaBrassica napus var. napuse0
- Treatment
- Treatment with Herbaspirillum sp. RFNB26e0
- Interactor
- Herbaspirillum sp. RFNB26e0symbiont
- Outcome
- seedling vigor, and dry biomasse0
- Direction
- maximume0
- Setting
- under gnotobiotic conditionse1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Treatment with Herbaspirillum sp. RFNB26 resulted in maximum root length (54.3%), seedling vigor, and dry biomass in canola”
e1“under gnotobiotic conditions”
Claim · model-written summary
Paenibacillus sp. RFNB4 had the lowest plant growth promoting activity under gnotobiotic conditions.
- Taxon
- canolaBrassica napus var. napuse1
- Interactor
- Paenibacillus sp. RFNB4e0symbiont
- Outcome
- lowest activitye0
- Direction
- loweste0
- Setting
- under gnotobiotic conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Paenibacillus sp. RFNB4 exhibited the lowest activity under gnotobiotic conditions”
e1“canola and rice plants”
Claim · model-written summary
Paenibacillus sp. RFNB4 increased canola plant height by 42.3% in pot culture.
- Taxon
- canolaBrassica napus var. napuse1
- Treatment
- Paenibacillus sp. RFNB4e0
- Interactor
- Paenibacillus sp. RFNB4e0symbiont
- Outcome
- plant heighte0
- Direction
- increasede0
- Value
- 42.3%e0
- Setting
- pot culture conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“under pot culture conditions, Paenibacillus sp. RFNB4 significantly increased plant height and dry biomass production by 42.3% and 29.5%, respectively.”
e1“canola plants”
Claim · model-written summary
Paenibacillus sp. RFNB4 increased canola dry biomass by 29.5% in pot culture.
- Taxon
- canolaBrassica napus var. napuse1
- Treatment
- Paenibacillus sp. RFNB4e0
- Interactor
- Paenibacillus sp. RFNB4e0symbiont
- Outcome
- dry biomass productione0
- Direction
- increasede0
- Value
- 29.5%e0
- Setting
- pot culture conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“under pot culture conditions, Paenibacillus sp. RFNB4 significantly increased plant height and dry biomass production by 42.3% and 29.5%, respectively.”
e1“canola plants”
Claim · model-written summary
Bacillus sp. RFNB6 inoculation increased nitrogenase activity in canola plants and rhizosphere soils.
- Taxon
- CanolaBrassica napus var. napuse0
- Treatment
- inoculated with Bacillus sp. RFNB6e0
- Interactor
- Bacillus sp. RFNB6e0symbiont
- Outcome
- nitrogenase activitye0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Canola plants and rhizosphere soils inoculated with Bacillus sp. RFNB6 exhibited significantly higher nitrogenase activity.”
Claim · model-written summary
Serratia sp. RFNB18 increased rice plant height by 35.1% in greenhouse experiments.
- Taxon
- rice
Oryza sativae0 - Treatment
- Serratia sp. RFNB18e0
- Interactor
- Serratia sp. RFNB18Serratia sp. RFNB18e0symbiont
- Outcome
- plant heighte0
- Direction
- increasede0
- Value
- 35.1%e0
- Setting
- greenhouse experimentse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In greenhouse experiments, Serratia sp. RFNB18 increased rice plant height by 35.1%”
Claim · model-written summary
Xanthomonas sp. RFNB24 enhanced rice biomass production by 84.6% in greenhouse experiments.
- Taxon
- riceOryza sativae0
- Treatment
- Xanthomonas sp. RFNB24e0
- Interactor
- Xanthomonas sp. RFNB24e0symbiont
- Outcome
- biomass productione0
- Direction
- enhancede0
- Value
- 84.6%e0
- Setting
- greenhouse experimentse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In greenhouse experiments, Serratia sp. RFNB18 increased rice plant height by 35.1%, Xanthomonas sp. RFNB24 enhanced biomass production by 84.6%”
Claim · model-written summary
Herbaspirillum sp. RFNB26 inoculation yielded the highest nitrogenase activity in rice rhizosphere soils.
- Taxon
- riceOryza sativae0
- Treatment
- inoculated with Herbaspirillum sp. RFNB26e0
- Interactor
- Herbaspirillum sp. RFNB26e0symbiont
- Outcome
- nitrogenase activitye0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rice rhizosphere soils inoculated with Herbaspirillum sp. RFNB26 exhibited the highest nitrogenase activity.”
The same questions in other papers
Herbaspirillum · growth · Brassica napus (oilseed rape)Results agree
1 paper in the same direction as this paper
- positive
Paenibacillus · growth · Brassica napus (oilseed rape)Results agree
1 paper in the same direction as this paper
- positive
Paenibacillus · yield · Brassica napus (oilseed rape)Results agree
1 paper in the same direction as this paper
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Xanthomonas · yield · Oryza sativa (rice)Results agree
1 paper in the same direction as this paper
- positive
inoculation · physiology: enzyme activity · Oryza sativa (rice)Positive and negative results
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- no effect
- positive
- positive
19 papers more in this group
See all 23 papers →inoculation · physiology: enzyme activity · Brassica napus (oilseed rape)Results agree
1 paper in the same direction as this paper
- 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.