Abstract
Plant growth-promoting endophytic bacteria (PGPEB), producing auxins, are offered for a promising eco-friendly crop production. Precise bacterial strain selection is essential to ensure consistent and effective plant growth and resilience. Creating a model for the optimal dose-dependent interactions between PGPEB and hosts is necessary for understanding the mechanisms of high-precision selection of the inoculant composition to enhance bacterial preparations’ efficacy. This study investigated the impact of pre-sowing treatment with exogenous auxin indole-3-acetic acid (IAA) at various concentrations (0, 10, 1, 0.1, 0.01, 0.001, 0.0001, 0.00001 mg L−1) on the growth and antioxidant responses of three cultivars (cvs) of Phaseolus vulgaris L. (bean): Ufimskaya, Elsa, and Zolotistaya. The findings showed dose-dependent and cultivar-specific responses of 7-day-old bean seedlings to exogenous IAA. Ufimskaya cv exhibited significant increases in shoot, main root, and total root lengths at 0.001 mg L−1 IAA, while higher and lower concentrations inhibited growth. The reduced catalase (CAT) activity in roots and the elevated CAT activity in shoots correlated with shoot length and total root length of Ufimskaya cv. Importantly, the growth parameters exhibited weak or no correlations with malondialdehyde (MDA) and H2O2 content in roots and shoots, which is a peculiarity of the Ufimskaya cv response to exogenic IAA in contrast to the shown earlier response to inoculation with endophytes. The growth of only the main root of Elsa cv peaked at 0.1 mg L−1 IAA, and there were neutral or inhibitory effects with other concentrations. The positive correlation between CAT activity in shoots and the main root length and total root length as well as positive correlation between MDA content in roots and the total root length of Elsa cultivar were revealed. The shoot length and total root length of Zolotistaya cv were neutral or negatively responded to all concentration IAA, but the number of roots increased by 2–4 times. For Zolotistaya cv, positive correlations were observed between CAT activity in roots and the length of the main root and the total root length. Overall, these cultivar-specific antioxidant responses to exogenous IAA may help create models for optimal dose-dependent interactions between auxin-producing PGPEB and plants, enhancing the effectiveness of microbial preparations for consistent bean growth promotion.
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Claims 10
Claim · model-written summary
Ufimskaya seedling shoot, main root and total root lengths increased at 0.001 mg L−1 IAA.
- Taxon
- Phaseolus vulgaris L.
Phaseolus vulgarist0 - Material
- Ufimskaya cve0
- Treatment
- 0.001 mg L−1 IAAe0
- Outcome
- shoot, main root, and total root lengthse0
- Direction
- increasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ufimskaya cv exhibited significant increases in shoot, main root, and total root lengths at 0.001 mg L−1 IAA”
t0“Phaseolus vulgaris L. (bean): Ufimskaya”
Claim · model-written summary
Higher and lower IAA concentrations inhibited Ufimskaya growth.
- Taxon
- Phaseolus vulgaris L.Phaseolus vulgarist0
- Material
- Ufimskayat0
- Treatment
- higher and lower concentrationse0
- Outcome
- growthe0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“while higher and lower concentrations inhibited growth”
t0“Phaseolus vulgaris L. (bean): Ufimskaya”
Claim · model-written summary
Ufimskaya root CAT activity was reduced and shoot CAT activity elevated in correlation with shoot and total root lengths.
- Taxon
- Phaseolus vulgaris L.Phaseolus vulgarist0
- Material
- Ufimskaya cve0
- Organ / stage
- rootse0
- Gene
- catalase (CAT)e0
- Outcome
- shoot length and total root lengthe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The reduced catalase (CAT) activity in roots and the elevated CAT activity in shoots correlated with shoot length and total root length of Ufimskaya cv”
t0“Phaseolus vulgaris L. (bean): Ufimskaya”
Claim · model-written summary
Ufimskaya growth parameters showed weak or no correlation with MDA and H2O2 content.
- Taxon
- Phaseolus vulgaris L.Phaseolus vulgarist0
- Material
- Ufimskayat0
- Compound
- malondialdehyde (MDA) and H2O2 contente0
- Outcome
- growth parameterse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“growth parameters exhibited weak or no correlations with malondialdehyde (MDA) and H2O2 content in roots and shoots”
t0“Phaseolus vulgaris L. (bean): Ufimskaya”
Claim · model-written summary
Elsa main root growth peaked at 0.1 mg L−1 IAA.
- Taxon
- Phaseolus vulgaris L.Phaseolus vulgarist0
- Material
- Elsa cve0
- Treatment
- 0.1 mg L−1 IAAe0
- Outcome
- growth of only the main roote0
- Direction
- peakede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The growth of only the main root of Elsa cv peaked at 0.1 mg L−1 IAA”
t0“Phaseolus vulgaris L. (bean): Ufimskaya, Elsa”
Claim · model-written summary
Other IAA concentrations had neutral or inhibitory effects on Elsa main root growth.
- Taxon
- Phaseolus vulgaris L.Phaseolus vulgarist0
- Material
- Elsat0
- Treatment
- other concentrationse0
- Outcome
- neutral or inhibitory effectse0
- Direction
- inhibitorye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there were neutral or inhibitory effects with other concentrations”
t0“Phaseolus vulgaris L. (bean): Ufimskaya, Elsa”
Claim · model-written summary
Elsa shoot CAT activity correlated positively with main and total root lengths.
- Taxon
- Phaseolus vulgaris L.Phaseolus vulgarist0
- Material
- Elsat0
- Gene
- CATe0
- Outcome
- main root length and total root lengthe0
- Direction
- positivee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“positive correlation between CAT activity in shoots and the main root length and total root length”
t0“Phaseolus vulgaris L. (bean): Ufimskaya, Elsa”
Claim · model-written summary
Elsa root MDA content correlated positively with total root length.
- Taxon
- Phaseolus vulgaris L.Phaseolus vulgarist0
- Material
- Elsa cultivare0
- Compound
- MDA contente0
- Outcome
- total root lengthe0
- Direction
- positivee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“positive correlation between MDA content in roots and the total root length of Elsa cultivar”
t0“Phaseolus vulgaris L. (bean): Ufimskaya, Elsa”
Claim · model-written summary
Zolotistaya shoot and total root lengths responded neutrally or negatively to all IAA concentrations.
- Taxon
- Phaseolus vulgaris L.Phaseolus vulgarist0
- Material
- Zolotistaya cve0
- Treatment
- all concentration IAAe0
- Outcome
- shoot length and total root lengthe0
- Direction
- negativelye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The shoot length and total root length of Zolotistaya cv were neutral or negatively responded to all concentration IAA”
t0“Phaseolus vulgaris L. (bean): Ufimskaya, Elsa, and Zolotistaya”
Claim · model-written summary
Zolotistaya root CAT activity correlated positively with main and total root lengths.
- Taxon
- Phaseolus vulgaris L.Phaseolus vulgarist0
- Material
- Zolotistayat0
- Gene
- CATe0
- Outcome
- length of the main root and the total root lengthe0
- Direction
- positivee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“positive correlations were observed between CAT activity in roots and the length of the main root and the total root length”
t0“Phaseolus vulgaris L. (bean): Ufimskaya, Elsa, and Zolotistaya”
The same questions in other papers
indole-3-acetic acid · growth · Phaseolus vulgaris (common bean)Results differ
17 papers in the same direction as this paper · 13 in the opposite direction · 1 reporting no difference from an alternative
- positive
- negative
- negative
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