Abstract
Abstract. Agustiyani D, Dewi TK, Laili N, Nditasari A, Antonius S. 2021. Exploring biofertilizer potential of plant growth-promoting rhizobacteria candidates from different plant ecosystems. Biodiversitas 22: 2691-2698. Plant growth-promoting rhizobacteria (PGPR) have been widely used as inoculants to increase the growth of crops. This study aims to evaluate the effective PGPR strains according to their capability in various plant growth-promoting activities in vitro. Ten rhizosphere soil samples were obtained from several plant ecosystems in Bangkinang, Kampar, Sumatra Island, Indonesia. A total of 42 bacteria were isolated and tested for three plant growth–promoting activities i.e., phosphate solubilization, indole-3-acetic acid (IAA) production, and N fixation. Out of 42 isolates, 26 were positive for phosphate solubilization, 11 were positive for IAA production, and five were positive for N fixation. The qualitative and quantitative analysis of plant growth–promoting activities revealed that the highest phosphate solubilizing isolate was PK.4.2 (SI 4.33); the highest IAA-producing isolate was I.4.2 (73.1 ppm); while the highest N-fixing ability was NFB.1.1. According to the seed bioassay results, the shoot and root length of bok choy (Brassica rapa) seedlings were significantly enhanced with the PGPR isolates treatment. The highest shoot length (2.53 cm) was observed among seeds treated with I.4.2 isolate, followed by PK.6.1 (2.45 cm) and I.5.3 (2.07 cm). The NFB.1.1 isolate promoted the longest root length (6.4 cm), although this was similar with I.5.3 isolate (6.11 cm). Two isolates that showed significant plant growth–promoting activities were analyzed using 16S rDNA sequences. The two isolates had a close evolutionary relationship with genus Sinomonas strain Cw 108 (I.4.2) and Arthrobacter (I.5.3.).
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Claims 13
Claim · model-written summary
Among 42 bacterial isolates, 26 solubilized phosphate.
- Taxon
- bok choy (Brassica rapa)
Brassica rapae1 - Outcome
- phosphate solubilizatione0
- Value
- 26e0
- Qualifier
- 42 isolatese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Out of 42 isolates, 26 were positive for phosphate solubilization”
e1“the shoot and root length of bok choy (Brassica rapa) seedlings were significantly enhanced with the PGPR isolates treatment”
Claim · model-written summary
Eleven isolates produced IAA.
- Taxon
- bok choy (Brassica rapa)Brassica rapae1
- Outcome
- IAA productione0
- Value
- 11e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“11 were positive for IAA production”
e1“the shoot and root length of bok choy (Brassica rapa) seedlings were significantly enhanced with the PGPR isolates treatment”
Claim · model-written summary
Five isolates fixed nitrogen.
- Taxon
- bok choy (Brassica rapa)Brassica rapae1
- Outcome
- N fixatione0
- Value
- fivee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“five were positive for N fixation”
e1“the shoot and root length of bok choy (Brassica rapa) seedlings were significantly enhanced with the PGPR isolates treatment”
Claim · model-written summary
PK.4.2 had the highest phosphate solubilizing index, 4.33.
- Taxon
- bok choy (Brassica rapa)Brassica rapae1
- Material
- PK.4.2e0
- Outcome
- phosphate solubilizinge0
- Direction
- higheste0
- Value
- SI 4.33e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the highest phosphate solubilizing isolate was PK.4.2 (SI 4.33)”
e1“the shoot and root length of bok choy (Brassica rapa) seedlings were significantly enhanced with the PGPR isolates treatment”
Claim · model-written summary
I.4.2 had the highest IAA production, 73.1 ppm.
- Taxon
- bok choy (Brassica rapa)Brassica rapae1
- Material
- I.4.2e0
- Outcome
- IAA-producinge0
- Direction
- higheste0
- Value
- 73.1 ppme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the highest IAA-producing isolate was I.4.2 (73.1 ppm)”
e1“the shoot and root length of bok choy (Brassica rapa) seedlings were significantly enhanced with the PGPR isolates treatment”
Claim · model-written summary
NFB.1.1 had the highest nitrogen fixing ability.
- Taxon
- bok choy (Brassica rapa)Brassica rapae1
- Material
- NFB.1.1e0
- Outcome
- N-fixing abilitye0
- Direction
- higheste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the highest N-fixing ability was NFB.1.1”
e1“the shoot and root length of bok choy (Brassica rapa) seedlings were significantly enhanced with the PGPR isolates treatment”
Claim · model-written summary
PGPR treatments significantly increased bok choy shoot length.
- Taxon
- bok choy (Brassica rapa)Brassica rapae0
- Treatment
- PGPR isolates treatmente0
- Outcome
- shoote0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the shoot and root length of bok choy (Brassica rapa) seedlings were significantly enhanced with the PGPR isolates treatment”
Claim · model-written summary
PGPR treatments significantly increased bok choy root length.
- Taxon
- bok choy (Brassica rapa)Brassica rapae0
- Treatment
- PGPR isolates treatmente0
- Outcome
- root lengthe0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the shoot and root length of bok choy (Brassica rapa) seedlings were significantly enhanced with the PGPR isolates treatment”
Claim · model-written summary
I.4.2 treated seedlings reached the greatest shoot length, 2.53 cm.
- Taxon
- bok choy (Brassica rapa)Brassica rapae1
- Treatment
- I.4.2 isolatee0
- Interactor
- I.4.2 isolatee0symbiont
- Outcome
- shoot lengthe0
- Direction
- higheste0
- Value
- 2.53 cme0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest shoot length (2.53 cm) was observed among seeds treated with I.4.2 isolate”
e1“the shoot and root length of bok choy (Brassica rapa) seedlings were significantly enhanced with the PGPR isolates treatment”
Claim · model-written summary
PK.6.1 treated seedlings had shoot length of 2.45 cm.
- Taxon
- bok choy (Brassica rapa)Brassica rapae1
- Treatment
- PK.6.1e0
- Interactor
- PK.6.1e0symbiont
- Outcome
- shoot lengthe2
- Value
- 2.45 cme0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“followed by PK.6.1 (2.45 cm) and I.5.3 (2.07 cm)”
e1“the shoot and root length of bok choy (Brassica rapa) seedlings were significantly enhanced with the PGPR isolates treatment”
e2“The highest shoot length (2.53 cm) was observed among seeds treated with I.4.2 isolate”
Claim · model-written summary
I.5.3 treated seedlings had shoot length of 2.07 cm.
- Taxon
- bok choy (Brassica rapa)Brassica rapae1
- Treatment
- I.5.3e0
- Interactor
- I.5.3e0symbiont
- Outcome
- shoot lengthe2
- Value
- 2.07 cme0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“followed by PK.6.1 (2.45 cm) and I.5.3 (2.07 cm)”
e1“the shoot and root length of bok choy (Brassica rapa) seedlings were significantly enhanced with the PGPR isolates treatment”
e2“The highest shoot length (2.53 cm) was observed among seeds treated with I.4.2 isolate”
Claim · model-written summary
NFB.1.1 treated seedlings had the longest roots, 6.4 cm.
- Taxon
- bok choy (Brassica rapa)Brassica rapae1
- Treatment
- NFB.1.1 isolatee0
- Interactor
- NFB.1.1 isolatee0symbiont
- Outcome
- root lengthe0
- Direction
- longeste0
- Value
- 6.4 cme0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The NFB.1.1 isolate promoted the longest root length (6.4 cm)”
e1“the shoot and root length of bok choy (Brassica rapa) seedlings were significantly enhanced with the PGPR isolates treatment”
Claim · model-written summary
I.5.3 treated seedlings had root length of 6.11 cm, similar to NFB.1.1.
- Taxon
- bok choy (Brassica rapa)Brassica rapae1
- Treatment
- I.5.3 isolatee0
- Interactor
- I.5.3 isolatee0symbiont
- Outcome
- root lengthe2
- Direction
- similare0
- Value
- 6.11 cme0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“although this was similar with I.5.3 isolate (6.11 cm)”
e1“the shoot and root length of bok choy (Brassica rapa) seedlings were significantly enhanced with the PGPR isolates treatment”
e2“The NFB.1.1 isolate promoted the longest root length (6.4 cm)”
The same questions in other papers
inoculation · growth · Brassica rapa (field mustard)Positive and negative results
45 papers in the same direction as this paper · 5 in the opposite direction
- no effect
- negative
- negative
47 papers more in this group
See all 51 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.