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    Home > Biochemistry News > Biotechnology News > Comparative analysis of the genomes of 47 magnolia plants.

    Comparative analysis of the genomes of 47 magnolia plants.

    • Last Update: 2020-08-23
    • Source: Internet
    • Author: User
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    Magnolia plants have nearly 10,000 species, mainly woody plants, is the third largest group of quiddy plants, in the Cronquist classification is considered to be a relatively primitive group of gem leaf plants.
    , however, this group has a weak background in genetics and genomics research, and there are no representative species of genome-wide sequencing.
    recently, Song Yu, a biodiversity research group of the Xishuangdana Tropical Botanical Garden Integrated Conservation Center of the Chinese Academy of Sciences, systematically completed a comparative genomics study of the chlorophylics of species represented by various branches of this group.
    the chlorophynd genomes of most plethyroid plants are two-stranded ring-like structures, including large single-copy regions, small single-copy regions, and reverse repeat regions with identical sequences in opposite directions.
    reverse repeating regions play an important role in stabilizing the structure of the chlorophylome genome, while the reduction, expansion and loss of reverse repeating regions directly affect the changes in the structure of the chlorophylate genome, which may coincide with the process of species differentiation.
    based on a comparative analysis of the chlorophyll genomes of 47 magnolia plants, it was found that the genetic order and structure of the chlorophyllales representing the reverse repeating region of the plant's chlorophyllales and the early quiver plants represented the ambor trimester Chopoda and Nymphaea alba, early single-leaf plants represented the species Tofieldia thibetica, and early gemon plants represented the species Euptelea pleiosperma; Calycanthus floridus chlorophyll genome b-side reverse repeating region lost rpl2 gene and its flank gene inter-region sequence; camphor branch group including eusideroxylon, cryptocarya, endiandra, Beilschmiedia plant chlorophyll genome a side reverse repeating region also lost rpl2 And its flank gene inter-region sequence; the core group of camphor includes Nan (Phoebe), Machilus, Mountain Pepper (Lindera), Cinnamomum), Neolitsea and independent branches of neocinnamomum plant chlorophyll genome b side-repeating area lost rpl2-ycf2 large fragments. The genome of cassytha plant chlorophynds of changam parasitic plants loses the entire b-side reverse repeating area, while caryodaphnopsis henryi retains the complete reverse repeating area on both sides (ab).
    The above-mentioned fragment loss event that appears in the camphor family is likely to be an evolutionary independent event, closely related to the overall shrinkage of the yeast genome of camphor plants, and consistent with the process of the changer plant lineage, is an important evidence to support the rootless vine genus, the new camphor genus, the lemon fruit camphor genus as a single group, revealing the mutant pattern of the chlorophylis genome of magnolia plants.
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