Comparing root-associated microbial communities in Tamarix ramosissima across three Xinjiang basins, China

Abstract

Analyzing the root-associated microbial communities in desert plants during different seasons may provide a valuable understanding of how desert plants adapt to climate change in harsh environments. Hence, we selected root-associated microbial communities (bacteria and fungi) of Tamarix ramosissima from three regions (Cele, CL; Turpan, TLF; Mosuowan, MSW), focusing on three compartments: root endosphere (RE), rhizosphere soil (RS), and bulk soil (BS). Results indicated that the relative abundance of Actinobacteriota, Proteobacteria, and Ascomycota of root bacteria and fungi taxa was higher the in three compartments (RE, RS, and BS). In the CL region, there was a decline in the relative abundance of Proteobacteria within the RE followed by RS and BS during the autumn. During both summer and autumn, the relative abundance of Ascomycota declined with increasing sampling distance (from the TLF to the MSW to the CL) in the BS. Furthermore, in spring, the bacterial (BS) and fungal (BS) Chao1 and ACE index decreased in TLF compared to the MSW region. However, MSW had a higher bacterial Chao1 and Shannon index of the RE (in summer) and RS (in autumn) than the CL area. Overall, in spring, summer, and autumn, root-associated bacterial and fungal communities across various regions (CL, TLF, and MSW) were more responsive to climate and soil factors than plant nutrients. This research provides compelling theoretical evidence advocating for the restoration of degraded vegetation within arid environments, underscoring the critical significance of judicious plant management practices in these regions.