Castellano-Hinojosa A, Pérez-Tapia V, Bedmar EJ, Santillana N. Purple corn-associated rhizobacteria with potential for plant growth promotion.
J Appl Microbiol 2018;
124:1254-1264. [PMID:
29368373 DOI:
10.1111/jam.13708]
[Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2017] [Revised: 11/21/2017] [Accepted: 01/18/2018] [Indexed: 12/13/2022]
Abstract
AIMS
Purple corn (Zea mays var. purple amylaceum) is a native variety of the Peruvian Andes, cultivated at 3000 m since the pre-Inca times without N fertilization. We aimed to isolate and identify native plant growth-promoting rhizobacteria (PGPR) for future microbial-based inoculants.
METHODS AND RESULTS
Eighteen strains were isolated from the rhizosphere of purple corn plants grown without N fertilization in Ayacucho (Peru). The 16S rRNA gene clustered the 18 strains into nine groups that contained species of Bacillus, Stenotrophomonas, Achromobacter, Paenibacillus, Pseudomonas and Lysinibacillus. A representative strain from each group was selected and assayed for N2 fixation, phosphate solubilization, indole acetic and siderophore production, 1-aminocyclopropane-1-carboxylic acid deaminase activity and biocontrol abilities. Inoculation of purple corn plants with single and combined strains selected after a principal component analysis caused significant increases in root and shoot dry weight, total C and N contents of the plants.
CONCLUSIONS
PGPRs can support growth and crop production of purple corn in the Peruvian Andes and constitute the base for microbial-based inoculants.
SIGNIFICANCE AND IMPACT OF THE STUDY
This study enlarges our knowledge on plant-microbial interactions in high altitude mountains and provides new applications for PGPR inoculation in purple amylaceum corn, which is part of the staple diet for the native Quechua communities.
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