In:
Chemistry & Biodiversity, Wiley, Vol. 13, No. 3 ( 2016-03), p. 319-330
Abstract:
Plants produce a variety of secondary metabolites to improve their performance upon exposure to pathogens, pests, herbivores, or environmental stresses. Secondary metabolism in plants is, therefore, highly regulated by presence of biotic or abiotic elicitors in the environment. The present research was undertaken to characterize plant growth‐promoting attributes of four plant growth‐promoting rhizobacteria ( PGPR ) including two Pseudomonas fluorescens ( Pf Ap1, Pf Ap18) and two P. putida ( Pp Ap9, Pp Ap14) strains, and to determine their role (individually or in consortium) on growth of Salvia officialis , and biosynthesis of secondary metabolites such as essential oils ( EO s), total phenolics, and flavonoids. The antioxidant and antibacterial properties of the extracts and EO s obtained from the inoculated plants were also investigated. The PGPR inoculum was applied to soil, cuttings, and foliage. Results indicated that different PGPR strains varied in their efficiency for production of auxin, siderophore, 1‐aminocyclopropane‐1‐carboxylate deaminase, and phosphate solubilization. All individually inoculated plants had significantly higher shoot and root biomass, leaf P content, EO s yield, total phenolics, and flavonoids content compared to uninoculated control plants. The major constituents of EO s, cis ‐thujene, camphor, and 1,8‐cineol, increased following inoculation with reference PGPR s. Although the extract from all inoculated plants had improved antioxidant activity, it was remarkable for the Pf Ap18 strain, which had the lowest IC 50 value across treatments. Antibacterial assay of various EO s and their major constituents against pathogenic bacteria showed that the highest activity was observed against Staphylococcus aureus using EO s of Pp Ap14 source. Based on our findings, we suggest that individual inoculation with effective PGPR strains can substantially improve plant growth and secondary metabolism in S. officinalis plants.
Type of Medium:
Online Resource
ISSN:
1612-1872
,
1612-1880
DOI:
10.1002/cbdv.201500082
Language:
English
Publisher:
Wiley
Publication Date:
2016
detail.hit.zdb_id:
2139001-0
SSG:
12
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