Auxin-Producing Bacteria Used as Microbial Biostimulants Improve the Growth of Tomato ( Solanum lycopersicum L.) Seedlings in Hydroponic Systems

Seven auxin-producing endophytic bacterial strains ( spp., , spp.), and two different combinations of these strains were used to verify their influence on tomato during germination and development in hydroponic conditions where, as a novelty for Canestrino di Lucca cultivar, endophytic bacteria were...

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Bibliographic Details
Published in:Biotech (Basel) 2024-08, Vol.13 (3), p.32
Main Authors: Pappalettere, Livia, Bartolini, Susanna, Toffanin, Annita
Format: Article
Language:English
Subjects:
Abiotic stress
Agricultural production
Auxins
Azospirillum
Azospirillum spp
Bacillus spp
Bacteria
Correlation analysis
Cultivars
Endophytes
endophytic bacteria
Fertilizers
Germination
hydroponic
IAA
Microorganisms
Nitrogen
Nutrients
Pathogens
Plant growth
Plantlets
rhizobacteria
Seedlings
Seeds
Strains (organisms)
Tomatoes
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Summary:Seven auxin-producing endophytic bacterial strains ( spp., , spp.), and two different combinations of these strains were used to verify their influence on tomato during germination and development in hydroponic conditions where, as a novelty for Canestrino di Lucca cultivar, endophytic bacteria were inoculated. To emphasize the presence of bacterial auxins in roots and stems of seedlings, both in situ staining qualitative assessment and quantitative analysis were carried out. Moreover, hypogeal and epigeal growth of the plantlets were measured, and correlation analyses were conducted to examine the relationship between the amount of indolacetic acid (IAA) produced by the bacterial strains and root and stem parameters. Plantlets treated with microbial inoculants showed a significant increase in the survival rate compared to the control treatment. The best results as IAA producers were from Sp245 and Cd, which also induced significant root growth. On the other hand, and induced the best rates in stem growth. These findings highlight the potential for using endophytic bacterial strains in a hydroponic co-cultivation system that enables inoculating plantlets, at an early stage of growth (5 days old).
ISSN:2673-6284
2673-6284
DOI:10.3390/biotech13030032