| Name: | Description: | Size: | Format: | |
|---|---|---|---|---|
| 55.68 KB | Adobe PDF |
Advisor(s)
Abstract(s)
P-deficiency in soils is a limiting factor for plant growth. Several phosphate-solubilizing rhizobacteria (PSB) were used to enhance growth of Zea maysgrowing in a P-deficient soil.
Strains were screened for their ability to solubilize P and to produce plant growth promoting (PGP) substances. The best-P solubilizing strains Rhodococcus sp. EC35, Pseudomonas sp. EAV and Arthrobacter nicotinovoransEAPAA were inoculated in maize growing in P-deficient soils without P fertilization and amended with soluble (KH2PO4) and insoluble P (Ca3(PO4)2).
Results showed that PSB significantly enhanced Z. mays biomass production in all Ptreatments. Without P fertilization, bacterial inoculation increased plant dry biomass by ca. 20%, while under soluble P conditions the enhancement was higher. Pseudomonas sp. EAV
was the strain that better performed improving rootand shoot biomass by 104% and 60%, respectively. In soils amended with insoluble P, plant biomass was also positive influenced by bacterial inoculation. Plant growth enhancement seems to be related not only to Psolubilization but also to other PGP traits, such as IAA and ACC-deaminase. This work shows that PSB may be used as bioinoculants and consequently constitute an attractive alternative to the phosphatic fertilizers amendments used to improve crop production.
Description
Keywords
Phosphate-solubilizing bacteria Plant growth promotion P solubilization
Citation
PEREIRA, Sofia I.A.; CASTRO, Paula M.L. - The effect of phosphate-solubilizing rhizobacteria on Zea mays growth on P-deficient soils. In MicroBiotec’13, Aveiro, Portugal, 6-8 December 2013 - In MICROBIOTECH 2013: Book of Abstracts. p. 211. Available at: http://microbiotec13.web.ua.pt/docs/e-book%20Microbiotec%202013%20Aveiro.pdf