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Marcelle Michelotti Bettoni,Átila Francisco Mogor,Volnei Pauletti,Nieves Goicoechea 한국원예학회 2017 Horticulture, Environment, and Biotechnology Vol.58 No.5
The combined application of humic substances and mycorrhizal inocula under increased CO2 in the air is apromising horticultural technique for improving the quality of greenhouse-grown onion seedlings. The objective of thisstudy was to evaluate if the development and qualitative characteristics of bulbs from the yellow onion Allium cepaL. Alfa São Francisco improved with the application of the abovementioned agronomic, biotic, and environmentalfactors. The lowest dry matter was achieved in bulbs of onions not inoculated with mycorrhizal fungi, non-amendedwith humic acids (HA), and grown at ambient CO2. Mycorrhizal inoculation significantly increased bulb biomass inplants cultivated at ambient CO2, and not fertilized with HA, which may be a consequence of the enhanced acidphosphatase activity in roots. The application of HA always increased bulb dry matter, which were more evident atelevated rather than ambient CO2 conditions and correlated with improved acid phosphatase activity in the plants atelevated CO2. Mycorrhizal inoculation, HA supplementation, and elevated CO2 in the air had an additive effect ofincreasing the content of soluble sugars, proteins, and phenolics in bulbs. While high levels of sugars and proteinsenhanced the energetic value of onions, the increase in phenolics improved their antioxidant properties. The tripleinteraction between mycorrhization, HA fertilization, and elevated CO2 also increased the ratio between soluble solidsand total titratable acidity, which may enhance the perception of sweetness and make onions more pleasant forconsumption.
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