期刊
BMC PLANT BIOLOGY
卷 22, 期 1, 页码 -出版社
BMC
DOI: 10.1186/s12870-022-03573-1
关键词
Gastrodia; Genome evolution; Mycoheterotrophy; Mycorrhizal roots
资金
- National Natural Science Foundation of China [31870195]
By analyzing the genome of Gastrodia menghaiensis, it was found that the number of genes in the Gastrodia genome is globally diminished compared to autotrophic orchids, but the number of genes involved in biological interaction with symbiotic microbionts is higher.
Background To illustrate the molecular mechanism of mycoheterotrophic interactions between orchids and fungi, we assembled chromosome-level reference genome of Gastrodia menghaiensis (Orchidaceae) and analyzed the genomes of two species of Gastrodia. Results Our analyses indicated that the genomes of Gastrodia are globally diminished in comparison to autotrophic orchids, even compared to Cuscuta (a plant parasite). Genes involved in arbuscular mycorrhizae colonization were found in genomes of Gastrodia, and many of the genes involved biological interaction between Gatrodia and symbiotic microbionts are more numerous than in photosynthetic orchids. The highly expressed genes for fatty acid and ammonium root transporters suggest that fungi receive material from orchids, although most raw materials flow from the fungi. Many nuclear genes (e.g. biosynthesis of aromatic amino acid L-tryptophan) supporting plastid functions are expanded compared to photosynthetic orchids, an indication of the importance of plastids even in totally mycoheterotrophic species. Conclusion Gastrodia menghaiensis has the smallest proteome thus far among angiosperms. Many of the genes involved biological interaction between Gatrodia and symbiotic microbionts are more numerous than in photosynthetic orchids.
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