Abstract
Develo** new and natural sources of plant growth promotors is essential to ensure the safe and sustainable production of vegetables for human consumption. In recent years, the potential of microalgae as plant biostimulants has been investigated. Arthrospira platensis (Spirulina platensis) biomass is a recognized protein source and its enzymatic hydrolysis contains molecules such as polyamines with potential to promote plant growth. Therefore, the aim of the present study was to investigate the biostimulant properties of hydrolyzed biomass of A. platensis. Bioassays were performed to determine auxin-like and cytokinin-like bioactivity of the hydrolysates. In addition, its effect on lettuce seedling growth was investigated and an organic system field trail performed where yield and free polyamine levels in leaves quantified. The hydrolysates had a cytokinin-like effect in the bioassay. Foliar applications promoted the growth of lettuce seedlings with the 4-h reaction hydrolysate (Sph4) being the most effective at promoting growth and increasing the spermine content by 64% in the lettuce leaves. The polyamine concentration was also compared in non-hydrolyzed A. platensis and Sph4. Hydrolysis resulted in a 34% increase in spermine content. It was concluded that Sph4 is a natural plant growth promoter that can be used as a raw material for biostimulants, and spermine could be an active compound and a metabolic indicator of Sph4 bioactivity.
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Acknowledgements
The publication is supported by the EFOP-3.6.3-VEKOP-16-2017-00008 project. The project is co-financed by the European Union and the European Social Fund. The authors highly appreciate the valuable contribution of Dr. Wendy Ann Stirk to the improvement of the manuscript and to Dr. Sergio O. Lourenço and Dra. Elisabete Barbarino for providing the cyanobacterium strain from Microalgae Collection “Elizabeth Aidar” at Fluminense Federal University, Niteroi, Rio de Janeiro—Brazil.
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Mógor, Á.F., Ördög, V., Lima, G.P.P. et al. Biostimulant properties of cyanobacterial hydrolysate related to polyamines. J Appl Phycol 30, 453–460 (2018). https://doi.org/10.1007/s10811-017-1242-z
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DOI: https://doi.org/10.1007/s10811-017-1242-z