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Scientists reveal new adversity evolution mechanism of tree-fungi symbiosis |
Schematic diagram of the mechanism of action of positive selection on the melanin synthesis gene cluster of Salina aurantiacus rhizosphere.
Photo courtesy of Yalin
Photo courtesy of Yalin
Dark septate endophytes (DSE) are a group of fungi commonly found in the roots of trees and herbs, which can improve plant growth and stress resistance
.
Especially in extreme environments, the abundance of DSE is often higher than that of mycorrhizal fungi
The forestry microbiology research team of the Institute of Subtropical Forestry, Chinese Academy of Forestry continues to engage in tree-fungus symbiosis and interaction, and has systematically studied the population structure and function of DSE fungi in tidal flat saline-alkali land with scientific research institutions at home and abroad
.
They isolated and identified a new DSE fungus- Laburnicola rhizohalophila sp.
nov ( Laburnicola rhizohalophila sp.
nov )
.
The high-throughput analysis of the microbial community showed that the new species is a core member of the rhizosphere microbiome, and can establish a symbiotic relationship with model tree species such as poplars.
Laburnicola rhizohalophila sp.
To this end, the PacBio and Illumina genomes were finely assembled on one of the strains, and the genomes of the remaining 29 strains were re-sequenced
.
Based on the SNP locus, the genetic structure of the population was studied, and two distinct subpopulations were identified.
Through further analysis, it was found that a melanin synthesis gene island in the genome of one of the subgroups was subject to strong positive selection
.
Further in vitro tests showed that the melanin content of this subgroup under salt stress conditions was significantly higher than that of the other subgroup, further supporting the above inference
Whether DSEs can synthesize more melanin under salt stress can indirectly improve the salt tolerance of trees is a topic currently being explored
Two of these strains are heterodiploids formed by the hybridization of the above two subgroups, breaking the traditional understanding that most filamentous fungi in nature are haploids
Related research results of this research were published in "Fungal Biology", "Genome Biology and Evolution" and "Journal of the International Society of Microbial Ecology" ("The ISME Journal").
"), and applied for 1 patent
.
(Source: China Science News Li Chen)
Related paper information: https://doi.
https://doi.
https://doi.
https://doi.
org/10.
1038/s41396-021-01023-8