Bibliographic citations
Solórzano, R., (2023). Inoculación de Persea americana con rizobacterias de los géneros Pseudomonas y Bacillus antagonistas de Phytophthora cinnamomi y Lasiodiplodia theobromae [Universidad Nacional Agraria La Molina]. https://hdl.handle.net/20.500.12996/5814
Solórzano, R., Inoculación de Persea americana con rizobacterias de los géneros Pseudomonas y Bacillus antagonistas de Phytophthora cinnamomi y Lasiodiplodia theobromae []. PE: Universidad Nacional Agraria La Molina; 2023. https://hdl.handle.net/20.500.12996/5814
@phdthesis{renati/1114405,
title = "Inoculación de Persea americana con rizobacterias de los géneros Pseudomonas y Bacillus antagonistas de Phytophthora cinnamomi y Lasiodiplodia theobromae",
author = "Solórzano Acosta, Richard Andi",
publisher = "Universidad Nacional Agraria La Molina",
year = "2023"
}
The present investigation was conducted under the objective of isolating, identifying and characterizing plant growth promoting bacteria associated with the genera Pseudomonas and Bacillus. Avocado seedlings of the Zutano variety were inoculated with 10 strains selected from 26 isolates in which Bacillus subtilis increased the number of leaves, fresh weight of leaves and roots, dry weight of roots, stems and leaves, and leaf area. The in vitro antagonistic activity was evaluated on Phytophthora cinnamomi where the Bac F (B. subtilis) and P3 (P. putida) strains generate an inhibition halo of 45 percent and 47 percent respectively; and on Lasiodiplodia theobromae the Bac F strain obtained 33.33 percent. At the greenhouse level, Bac F reduced the severity of the symptoms caused by P. cinnamomi and significantly increased root length and dry weight. The interaction between mycorrhizae and the promoter bacteria was evaluated; against the presence of P. cinnamomi and it was found that mycorrhizae improve plant growth parameters such as root length and moisture content despite being infected by P. cinnamomi; while the PGP bacteria had an effect in increasing the absorption of potassium, calcium, and magnesium. The interaction between mycorrhizae and bacteria was also evaluated under salinity conditions in which the rhizobacteria P. plecoglossicida and B. subtilis decrease the accumulation of chlorine and sodium ions; and decrease the loss of dry matter. Arbuscular mycorrhizae increase the accumulation of sodium, potassium, and chloride ions; and decrease the accumulation of sodium ion in the leaves compared to the control, they also increase the dry matter content. It is concluded that the avocado rhizosphere of the Hass/Zutano variety is related to the genera Pseudomonas, Bacillus and Lysinibacillus, and the species B. subtilis stands out for its plant growth promoting activity, improvement of resistance against saline stress, and it is confirmed. the potential of the antagonistic rhizobacteria B. subtilis and P. putida for the biological control of root rot (P. cinnamomi) and avocado dieback (L. theobromae) both independently and in interaction with arbuscular mycorrhizae
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