2014 Cilt 8 Sayı 22
Permanent URI for this collectionhttps://hdl.handle.net/11452/17007
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Browsing by Author "Ghorbanpour, Mansour"
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Item Biopriming of salvia officinalis seed with growth promoting rhizobacteria affects invigoration and germination indices(Uludağ Üniversitesi, 2014-05-11) Ghorbanpour, Mansour; Hatami, MehrnazPlant growth promoting rhizobacteria (PGPRs) are a group of bacteria that can actively colonize plant roots and can modulate plant growth. The present study was aimed to investigate the effects of three PGPRs strains designated as Pseudomonas fluorescens (PF23) and P. putida (PP-41 and PP-159) on seed germination features including germination percentage (GP), mean time germination (MTG), germination rate (GR), root and shoot length and seedling vigor index (VI) of Salvia officinalis L. The bacterial suspension (109 CFU/ml) was used to inoculate the seeds under aseptic conditions. Results revealed that seed treatment of S. officinalis with rhizobacteria including PF-23, PP-41and PP-159 affects differently germination parameters. The maximum (78.5%) and minimum (16.75%) final GP were recorded in PP-41 and PF-23 treatment, respectively. Also, the highest GR, root and shoot length, seedling VI and the lowest MTG were recorded in seeds treated with PP-41, a strain with ability to produce moderate auxin, when compared to the other treatments. It is concluded that net effect of plant–rhizobacteria interactions on seed germination behaviors could be positive, neutral or negative. On the other hand, different strains of rhizobacteria had variable effects i.e., positive, negative and inconsequential effects of PGPRs application were observed on seed germination, root elongation and subsequently seedling VI. As a conclusion, the role of biopriming with PGPRs on germination characteristics and seedling growth varied with bacteria strains.Item Nano-anatase TiO2 modulates the germination behavior and seedling vigority of some commercially important medicinal and aromatic plants(Uludağ Üniversitesi, 2014-05-11) Hatami, Mehrnaz; Ghorbanpour, Mansour; Salehiarjomand, HosseinNanoparticles have been applied worldwide, posing substantial effects on the environment and its living organisms. Plants as sessile organisms are always exposed to considerable fluctuations of nanoparticles concentrations. In this research, the influence of different concentrations (0, 10, 20, 40 and 80 mg.L-1 ) of nanosized TiO2 were studied on seed germination parameters including germination percentage (GP %), mean time germination (MTG), germination rate (GR), germination index (GI) and seedling vigor index (SVI) of five different medicinal plant species namely Salvia mirzayanii, Alyssum homolocarpum, Sinapis alba, Carum copticum, Nigella sativa. Results indicated that significant differences in examined traits were found among the plant species and also among the employed TiO2 concentrations. Among the plant species, the highest GR (87%) was observed in S. alba seeds at the 20 mg.L-1 TiO2 concentration, however, in S. mirzayanii plants it was obtained at 80 mg.L-1 TiO2. The lowest MTG (1.55 day) was observed in A. homolocarpum seeds at 10 mg.L-1 TiO2 concentration. Moreover, the highest SVI (102.6) was observed in the 20 mg.L-1 of the reference treatment for S. alba seeds. In N. sativa seeds, the highest GI value (9.29) was found at the anatase concentration of 20 mg.L-1 . In conclusion, application of TiO2 stimulated the seed germination of all species. However, this response was dependent on the concentration of applied TiO2 and plant species as well.