Reconstruction of chromosome rearrangements between the two most ancestral duckweed species Spirodela polyrhiza and S. intermedia
The monophyletic duckweeds comprising five genera within the monocot order Alismatales are neotenic, free-floating, aquatic organisms with fast vegetative propagation. Some species are considered for efficient biomass production, for life stock feeding, and for (simultaneous) wastewater phytore...
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| 格式: | Journal article |
| 语言: | English |
| 出版: |
2022
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| 主题: | |
| 在线阅读: | http://scholar.dlu.edu.vn/handle/123456789/1025 |
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| Thư viện lưu trữ: | Thư viện Trường Đại học Đà Lạt |
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| 总结: | The monophyletic duckweeds comprising five
genera within the monocot order Alismatales are neotenic,
free-floating, aquatic organisms with fast vegetative propagation.
Some species are considered for efficient biomass
production, for life stock feeding, and for (simultaneous)
wastewater phytoremediation. The ancestral genus Spirodela
consists of only two species, Spirodela polyrhiza and
Spirodela intermedia, both with a similar small genome
(~160 Mbp/1C). Reference genome drafts and a physical
map of 96 BACs on the 20 chromosome pairs of
S. polyrhiza strain 7498 are available and provide useful tools
for further evolutionary studies within and between duckweed
genera. Here we applied sequential comparative multicolor
fluorescence in situ hybridization (mcFISH) to address
homeologous chromosomes in S. intermedia (2n = 36), to
detect chromosome rearrangements between both species
and to elucidate the mechanisms which may have led to the
chromosome number alteration after their evolutionary separation.
Ten chromosome pairs proved to be conserved between
S. polyrhiza and S. intermedia, the remaining ones experienced,
depending on the assumed direction of evolution,
translocations, inversion, and fissions, respectively. These
results represent a first step to unravel karyotype evolution
among duckweeds and are anchor points for future genome
assembly of S. intermedia. |
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