Abstract
This study is aimed at determining the characteristics and microbiota of soil upon which some Turkish Colchicum (Colchicaceae) species naturally grows. For this aim the rhizosphere soil samples of Colchicum balansae Planch., Colchicum triphyllum Kunze and Colchicum variegatum L. were analysed in this research. The carbon mineralization rate of C. balansae soil at p<0.05 is significantly different from that of the other two soils. In terms of nitrogen mineralization, significant difference exists between all the three soils (p<0.001). Colchicum variegatum rhizosphere was found to have the highest bacterial diversity. The results revealed that 254 bacterial species were common to the three rhizosphere soils, 35.60% of the bacterial species were unique to C. variegatum soil while 21.89% and 22.67% of the bacterial species were unique to C. balansae and C. triphyllum soil respectively. It was found that C. variegatum and C. balansae collected from areas close to each other had the highest number of common bacterial species, while C. triphyllum from the distant region shared 75 with C. variegatum and 19 with C. balansae. Metagenomics analysis reveals that in the rhizophere of C. variegatum, C. balansae and C. triphyllum, Actinobacteria is dominant at phylum level. Likewise, in C. variegatum soil, Nitrosocosmicus and halophilic Halobacter were found to be the dominant archaea. In the soils of C. triphyllum and C. balansae Saccharomycetales were detected, while Cryptococcus neoformans var. grubii H99 was exclusively detected in C. balansae soil. Significant difference (p<0.05) was observed in C. variegatum rhizosphere soil in terms of organic carbon (C%) and carbon mineralization from the other two soil samples. Significant differences were observed in all three soils in terms of nitrogen content, and the C. triphyllum rhizosphere soil was significantly different from the others in terms of available phosphorus content (p<0.05). This study showed that biological as well as the physico-chemical properties of the rhizosphere soil regulate soil microbial diversity and density and by extension influences their activity which evidently manifests itself in carbon and nitrogen mineralisation.
Highlights
Organisms are colonised by microbes, which were found to have significant impacts on the development and health of their hosts (Berg et al 2016, Mendes & Raaijmakers 2015)
The rhizosphere soils of C. variegatum, C. balansae and C. triphyllum were separately collected from MuğlaKale Road (37o15’34.3” N, 28o40’11.9” E), Datça-Knidos Road (36o43’31” N, 27o35’49” E) and NiğdeÇamardı (37o50’16” N, 35o1’26” E) Turkey, respectively
Carbon mineralization curves clearly show the changes that occurred during organic matter decomposition in the soils (Fig. 1)
Summary
Organisms are colonised by microbes, which were found to have significant impacts on the development and health of their hosts (Berg et al 2016, Mendes & Raaijmakers 2015). Endosphere, rhizosphere and phyllosphere of plants provide microbial communities with specific functions. Substantial implication on the ecosystem arises due to fluctuations in plant - soil microbe interactions, because soil microbes influence plant growth and survivability through different mechanisms (Compant et al 2019). To predict future ecosystem function, series of comprehensive study on microbial communities and plants as well as their reaction towards climate change became crucial (Classen et al 2015). The properties of ecosystem are shaped and maintained via the interaction of soil microbes with one another and with the plant. (Chamomile) by microbes note that specific microbial communities are selected by different plants. As microbes proliferate in close proximity with a variety of host plants, fluctuations in environmental conditions influence their interactions amongst themselves and their plant hosts (Braga et al 2016)
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