Journal
BRAZILIAN JOURNAL OF MICROBIOLOGY
Volume 52, Issue 3, Pages 1417-1429Publisher
SPRINGER
DOI: 10.1007/s42770-021-00496-1
Keywords
Bromeliaceae; Campo Rupestre; Indole-3-acetic acid; Siderophores; Solubilizing phosphate; Water-tank yeast
Categories
Funding
- Fundacao de Amparo a Pesquisa do Estado de Minas Gerais (FAPEMIG) [CBB - APQ-02639-15]
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Research shows that the majority of yeast isolates from the tank bromeliad Vriesea minarum have the ability to promote plant growth, with Carlosrosaea yeast demonstrating particularly promising bioactivity and potential for future use as a biofertilizer.
Yeasts can play important roles in promoting plant growth; however, little information is available in this regard for yeasts in water of bromeliad tanks. Here, we characterize the ability of 79 yeast isolates from tank bromeliad Vriesea minarum, an endangered species, to solubilize phosphate, secrete siderophores, and synthesize indole-3-acetic acid (IAA). The results showed that 67.8% of all assayed yeast isolates mobilized inorganic phosphate; 40.0% secreted siderophores; and 89.9% synthetized IAA and IAA-like compounds. Among the species studied, Carlosrosaea vrieseae UFMG-CM-Y6724 is highlighted for producing IAA (76.1 mu g mL(-1)) and siderophores, and solubilizing phosphate. In addition, evaluation of the effects of filtrate containing IAA-like compounds produced by the C. vrieseae on the development and photosynthetic performance of V. minarum seedlings found it to improve seedling growth equal to that of commercial IAA. These results demonstrate that C. vrieseae can produce compounds with great potential for future use as biofertilizer agents.
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