Abstract
Plant growth-promoting rhizobacteria (PGPR) are beneficial bacteria that colonize plant roots and enhance plant growth by a wide variety of mechanisms. The use of PGPR is steadily increasing in agriculture and offers an attractive way to replace chemical fertilizers, pesticides, and supplements. Here, we have isolated and characterized the PGPR from the rhizosphere soil of rice field for the enhancement of growth of rice. Rhizosphere soils were collected from different areas of Mymensingh in Bangladesh. Ten isolates of bacteria, designated as PGB1, PGB2, PGB3, PGB4, PGB5, PGT1, PGT2, PGT3, PGG1 and PGG2, were successfully isolated and characterized. Subsequently, to investigate the effects of PGPR isolates on the growth of rice, a pot culture experiment was conducted. Prior to seeds grown in plastic pots, seeds were treated with PGPR isolates and seedlings were harvested after 21 days of inoculation. Isolates PGB4, PGT1, PGT2, PGT3, PGG1 and PGG2 induced the production of indole acetic acid (IAA), whereas only PGT3 isolate was able to solubilize phosphorus. Most of isolates resulted in a significant increase in plant height, root length, and dry matter production of shoot and root of rice seedlings. Furthermore, PGPR isolates remarkably increased seed germination of rice. Among the ten isolates, PGB4 and PGG2 were found almost equally better in all aspects such as dry matter production, plant height and root length of rice, and IAA production. Isolate PGT3 was also found to be promising in IAA production having an additional property of phosphate solubilization. The present study, therefore, suggests that the use of PGPR isolates PGB4, PGG2 and PGT3 as inoculant biofertilizers might be beneficial for rice cultivation as they enhanced growth of rice, and induced IAA production and phosphorus solubilization.
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Claims 7
Claim · model-written summary
Six isolates produced indole acetic acid.
- Taxon
- rice
Oryza sativat0 - Interactor
- PGB4, PGT1, PGT2, PGT3, PGG1 and PGG2e0symbiont
- Outcome
- production of indole acetic acid (IAA)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Isolates PGB4, PGT1, PGT2, PGT3, PGG1 and PGG2 induced the production of indole acetic acid (IAA)”
t0“rice”
Claim · model-written summary
PGT3 solubilized phosphorus.
- Taxon
- riceOryza sativat0
- Interactor
- PGT3e0symbiont
- Outcome
- PGT3 isolate was able to solubilize phosphoruse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“only PGT3 isolate was able to solubilize phosphorus”
t0“rice”
Claim · model-written summary
Most PGPR isolates significantly increased rice seedling height, root length and dry matter production.
- Taxon
- riceOryza sativae0
- Treatment
- treated with PGPR isolatese1
- Interactor
- PGPR isolatese1symbiont
- Outcome
- plant height, root length, and dry matter productione0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Most of isolates resulted in a significant increase in plant height, root length, and dry matter production of shoot and root of rice seedlings.”
e1“seeds were treated with PGPR isolates”
Claim · model-written summary
PGPR isolates increased rice seed germination.
- Taxon
- riceOryza sativae0
- Treatment
- PGPR isolatese0
- Interactor
- PGPR isolatese0symbiont
- Outcome
- seed germinatione0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“PGPR isolates remarkably increased seed germination of rice.”
Claim · model-written summary
PGB4 and PGG2 were nearly equally best for rice dry matter, height, root length and IAA production.
- Taxon
- riceOryza sativae0
- Interactor
- PGB4 and PGG2e0symbiont
- Outcome
- dry matter production, plant height and root length of rice, and IAA productione0
- Direction
- bettere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“PGB4 and PGG2 were found almost equally better in all aspects such as dry matter production, plant height and root length of rice, and IAA production.”
Claim · model-written summary
PGT3 was promising in IAA production and phosphate solubilization.
- Taxon
- riceOryza sativat0
- Interactor
- PGT3e0symbiont
- Outcome
- IAA production having an additional property of phosphate solubilizatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Isolate PGT3 was also found to be promising in IAA production having an additional property of phosphate solubilization.”
t0“rice”
Claim · model-written summary
The authors suggest PGB4, PGG2 and PGT3 as inoculant biofertilizers for rice cultivation.
- Taxon
- riceOryza sativae0
- Interactor
- PGPR isolates PGB4, PGG2 and PGT3e0symbiont
- Outcome
- use of PGPR isolates PGB4, PGG2 and PGT3 as inoculant biofertilizerse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“suggests that the use of PGPR isolates PGB4, PGG2 and PGT3 as inoculant biofertilizers might be beneficial for rice cultivation”
The same questions in other papers
inoculation · growth · Oryza sativa (rice)Positive and negative results
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- positive
- positive
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See all 399 papers →inoculation · yield · Oryza sativa (rice)Positive and negative results
381 papers in the same direction as this paper · 31 in the opposite direction · 5 reporting no difference from an alternative
- positive
- positive
- positive
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See all 418 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.