Phosphate-solubilizing characteristics of yeasts

Abstract

Phosphorus (P) is an essential element for plant development and metabolism. Because of its low availability and mobility in soils, it is often a limiting nutrient of plant growth. When phosphorus content in soil is insufficient, symptoms of phosphorus deficiency can appear, such as purple spots on leaves and stems or inhibition of development and maturation. To provide adequate nutrients for plant growth, appropriate fertilizers should be applied. However, overuse of chemical fertilizers can cause unanticipated environmental effects. To decrease the negative environmental effects resulting from continued use of chemical fertilizers, we can inoculate plants with phosphatesolubilizing microorganisms. Phosphate-solubilizing microorganisms are crucial in dissolving fertilizer phosphorus and bound phosphorus in soil in a manner that is both environmentally friendly and sustainable. In this study, we selected yeasts with calcium-phosphate-solubilizing ability and found that this ability to be regulated by environmental factors (e.g. amount of soluble phosphate, liquid or solid agar plates condition, and type of inorganic phosphate). Arabidopsis thaliana was inoculated with selected yeasts; we found that Cryptococcus laurentii (JYC370) promoted plant growth in an inorganic phosphate (Pi)-deficient medium supplemented with calcium phosphate dibasic dihydrate. The amount of cellular inorganic phosphate was also higher in yeasttreated plants than in control plants grown in the Pi-deficient medium. This result reveals the potential of these strains for biofertilizer applications and commercial use as biofertilizer agents in the future.

Plant growth-promoting properties of the phosphate-solubilizing red yeast Rhodosporidium paludigenum

“…This suggests that the phosphate-solubilizing ability of yeasts is affected by exposure to soluble phosphate. In contrast, in a previous study, we found that some yeast strains still dissolve calcium phosphate in the presence of a high concentration of soluble phosphate (Kuo et al 2018 ). In 2017, Zeng et al reported that the growth and mineral phosphate solubilization of a phosphate-solubilizing bacteria (PSB), Burkholderia multivorans WS-FJ9, can be affected by exogenous soluble phosphate (Zeng et al 2017 ).…”

“…pullulans JYC 104, in contrast, does not show solubilizing activity on either plate. In addition, in another earlier study, we found that the change in the pH of the medium is closely related to the phosphate-solubilizing ability of the yeasts (Kuo et al 2018 ). More soluble phosphate was dissolved in the medium with low pH.…”

Plant growth-promoting properties of the phosphate-solubilizing red yeast Rhodosporidium paludigenum, with fine-tuning capabilities

“…This suggests that the phosphate-solubilizing ability of yeasts is affected by exposure to soluble phosphate. In contrast, in a previous study, we found that some yeast strains still dissolve calcium phosphate in the presence of a high concentration of soluble phosphate (Kuo et al 2018). In 2017, Zeng et al reported that the growth and mineral phosphate solubilization of a phosphate-solubilizing bacteria (PSB), Burkholderia multivorans WS-FJ9, can be affected by exogenous soluble phosphate (Zeng et al 2017).…”

Residual brewer’s Saccharomyces cerevisiae yeasts as biofertilizers in horticultural seedlings: towards a sustainable industry and agriculture

“…The phosphorus solubilization efficiency value was 3.34, higher than those recorded by Fu et al (2016), where the inoculum of S. cerevisiae was adjusted to an optical density of 0.10 at 600 nm. Conversely, the zinc solubilization efficiency (SE=2.58) was high but lower than those recorded in various strains of S. cerevisiae (10 8 cell mL −1 ) by Fernandez-San Millan et al, 2020. It is important to note that the solubilization of these compounds is associated with factors such as substrate concentration, medium pH, and temperature (Xiao et al, 2013;Nutaratat et al, 2014;Kuo et al, 2018). Therefore, it is advisable to take into account these potential discrepancies when comparing and analyzing reports on the solubilization of the compounds in question.…”