数字农科院2.0

The genome of Eleocharis vivipara elucidates the genetics of C3-C4 photosynthetic plasticity and karyotype evolution in the Cyperaceae

文献类型： 外文期刊

作者： Liu, Hongbing;Zhao, Hang;Zhang, Yanwen;Li, Xiuli;Zuo, Yi;Wu, Zhen;Jin, Kaining;Xian, Wenfei;Wang, Wenzheng;Ning, Weidong;Liu, Zijian;Zhao, Xiaoxiao;Wang, Lei;Sage, Rowan F.;Lu, Tiegang;Stata, Matt;Cheng, Shifeng

作者机构：

关键词： （1-1-1）C-4 photosynthesis;Cyperaceae;Eleocharis vivipara;evolution

期刊名称： JOURNAL OF INTEGRATIVE PLANT BIOLOGY

ISSN： 1672-9072

年卷期： 2024 年

页码：

收录情况： SCIE（2024版） ; ; CSCD（2023-2024年度） ; ; 科技核心（2024版）

摘要： Eleocharis vivipara, an amphibious sedge in the Cyperaceae family, has several remarkable properties, most notably its alternate use of C-3 photosynthesis underwater and C-4 photosynthesis on land. However, the absence of genomic data has hindered its utility for evolutionary and genetic research. Here, we present a high-quality genome for E. vivipara, representing the first chromosome-level genome for the Eleocharis genus, with an approximate size of 965.22 Mb mainly distributed across 10 chromosomes. Its Hi-C pattern, chromosome clustering results, and one-to-one genome synteny across two subgroups indicates a tetraploid structure with chromosome count 2n = 4x = 20. Phylogenetic analysis suggests that E. vivipara diverged from Cyperus esculentus approximately 32.96 million years ago (Mya), and underwent a whole-genome duplication (WGD) about 3.5 Mya. Numerous fusion and fission events were identified between the chromosomes of E. vivipara and its close relatives. We demonstrate that E. vivipara has holocentromeres, a chromosomal feature which can maintain the stability of such chromosomal rearrangements. Experimental transplantation and cross-section studies showed its terrestrial culms developed C-4 Kranz anatomy with increased number of chloroplasts in the bundle sheath (BS) cells. Gene expression and weighted gene co-expression network analysis (WGCNA) showed overall elevated expression of core genes associated with the C-4 pathway, and significant enrichment of genes related to modified culm anatomy and photosynthesis efficiency. We found evidence of mixed nicotinamide adenine dinucleotide - malic enzyme and phosphoenolpyruvate carboxykinase type C-4 photosynthesis in E. vivipara, and hypothesize that the evolution of C-4 photosynthesis predates the WGD event. The mixed type is dominated by subgenome A and supplemented by subgenome B. Collectively, our findings not only shed light on the evolution of E. vivipara and karyotype within the Cyperaceae family, but also provide valuable insights into the transition between C-3 and C-4 photosynthesis, offering promising avenues for crop improvement and breeding.

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