The adaptive evolution of Euryale ferox to the aquatic environment through paleo-hexaploidization
文献类型: 外文期刊
作者: Peng Wu1; 2; † ; Lingkui Zhang2; † ; Kang Zhang2; †; Yulai Yin3; † ; Ailian Liu1 ; Yue Zhu1 ; Yu Fu1;;Fangfang Sun3 ; Shuping Zhao1 ; Kai Feng1 ; Xuewen Xu1 ; Xuehao Chen1; * ; Feng Cheng2; *; Liangjun Li1; 4; *
关键词: Adaptive evolution; paleo-hexaploidization; aquatic plant; sub-genome; Euryale ferox
期刊名称: PLANT JOURNAL
ISSN: 0960-7412
年卷期: 2022 年
页码:
收录情况: SCIE(2022版) ; EI(2022版)
摘要: Occupation of living space is one of the main driving forces of adaptive evolution, especially for aquatic plants whose leaves float on the water surface and thus have limited living space. Euryale ferox, from the angiosperm basal family Nymphaeaceae, develops large, rapidly expanding leaves to compete for space on the water surface. Microscopic observation found that the cell proliferation of leaves is almost completed underwater, while the cell expansion occurs rapidly after they grows above water. To explore the mechanism underlying the specific development of leaves, we performed sequences assembly and analyzed the genome and transcriptome dynamics of E. ferox. Through reconstruction of the three sub-genomes generated from the paleo-hexaploidization event in E. ferox, we revealed that one sub-genome was phylogenetically closer to Victoria cruziana, which also exhibits gigantic floating leaves. Further analysis revealed that while all three sub-genomes promoted the evolution of the specific leaf development in E. ferox, the genes from the sub-genome closer to V. cruzianacontributed more to this adaptive evolution. Moreover, we found that genes involved in cell proliferation and expansion, photosynthesis, and energy transportation were over-retained and showed strong expression association with the leaf development stages, such as the expression divergence of SWEET orthologs as energy uploaders and unloaders in the sink and source leaf organs of E. ferox. These findings provide novel insights into the genome evolution through polyploidization, as well as the adaptive evolution regarding the leaf development accomplished through biased gene retention and expression sub-functionalization of multi-copy genes in E. ferox.
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