Potential seed germination-enhancing plant growth-promoting rhizobacteria for restoration of Pinus chiapensis ecosystems
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ORIGINAL PAPER
Potential seed germination‑enhancing plant growth‑promoting rhizobacteria for restoration of Pinus chiapensis ecosystems Cristina Domínguez‑Castillo1 · Julia María Alatorre‑Cruz2 · Dolores Castañeda‑Antonio1 · José Antonio Munive1 · Xianwu Guo3 · Jesús Francisco López‑Olguín1 · Luis Ernesto Fuentes‑Ramírez1 · Ricardo Carreño‑López1
Received: 3 February 2020 / Accepted: 16 June 2020 © Northeast Forestry University 2020
Abstract Rhizosphere soil samples of three Pinus chiapensis sites were analyzed for their physicochemical properties, soil bacteria isolated and screened in vitro for growthpromoting abilities. Nine isolates that showed promise were identified to five genera Dyella, Luteimonas, Enterobacter, Paraburkholderia and Bacillus based on the sequences of 16S rRNA gene. All the strains were isolated from nondisturbed stands. These bacteria significantly decreased germination time and increased sprout sizes. Indole acetic acid and gibberellin production and phosphate solubilisation were detected. Results indicate that these biochemicals could be essential for P. chiapensis distribution and suggest the possibility that PGPR inoculation on P. chiapensis seeds prior to planting could improve germination and possibly seedling development.
Project funding: This work was supported by SEP, Grant DSA / 103.5 / 15/10976 and VIEP-BUAP, Grant 20 Sub-Program. The online version is available at http://www.springerlink.com. Corresponding editor: Yanbo Hu. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11676-020-01250-3) contains supplementary material, which is available to authorized users. * Ricardo Carreño‑López [email protected] 1
Centro de Investigaciones en Ciencias Microbiológicas, Instituto de Ciencias, Benemérita Universidad Autónoma de Puebla, Puebla, México
2
Universidad Autónoma de Querétaro, Querétaro, México
3
Centro de Biotecnología Genómica, Instituto Politécnico Nacional, Reynosa, Tamaulipas, México
Keywords Pinus chiapensis · Plant growth-promoting rhizobacteria · Dyella · Luteimonas · Enterobacter
Introduction Efforts to modify the effects of climate change and preserve biodiversity, it is apparent that trees play an important role. The loss or degradation of forest ecosystems due to climate change is of considerable concern. Mexico is rich in temperate and tropical forests, with one-quarter of the total land area classified as forests, and is one of the countries with the world’s largest number of pine species. Pinus chiapensis (Martinez) Andresen is a Neotropical pine endemic to southern Mexico and southwestern Guatemala. In Mexico, it is most abundant in Oaxaca and Chiapas states as well as small populations in Puebla, Guerrero, and Veracruz (Del Castillo et al. 2009). Compared to other Neotropical pine species, P. chiapensis requires humid, warm localities (Donahue et al. 1991; Alba et al. 2003; Del Castillo et al. 2009) and grows on acidic soils at 600–2200 m a.s.l. on steep slopes (Dvorak et al. 1996). P. ch
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