The chromosome-level genome of Gypsophila paniculata reveals the molecular mechanism of floral development and ethylene insensitivity.
The chromosome-level genome of Gypsophila paniculata reveals the molecular mechanism of floral development and ethylene insensitivity.
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DOI：
10.1093/hr/uhac176
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发表时间：
2022
影响因子：
8.7
通讯作者：
中科院分区：
文献类型：
--
作者：
满天星（Gypsophila paniculata）属于石竹目石竹科（Caromellaceae），是世界上最著名的切花之一。它通常被用作干花，而花衰老的潜在机制尚未得到解决。在这里，我们提出了一个染色体规模的基因组组装G。paniculata的总大小为749.58 Mb。全基因组重复特征揭示了其进化史上的两个主要重复事件：一个发生在石竹科分化之前的古老事件和一个与石竹共享的最近事件。结合基因组和转录组数据的综合分析揭示了G.圆锥花序。AGAMOUS基因表达的降低可能是由于PETALOSA的序列多态性和miR172结合位点的突变引起的，这与G.圆锥花序。乙烯应答因子（ERS）的低表达和下游ERF基因拷贝数的减少共同导致G.圆锥花序，影响花衰老，使其能够制作干花。本研究为深入了解石竹科植物花发育和花衰老的基本规律奠定了基础，为进一步开展石竹科植物的分子育种奠定了基础。
Gypsophila paniculata, belonging to the Caryophyllaceae of the Caryophyllales, is one of the most famous worldwide cut flowers. It is commonly used as dried flowers, whereas the underlying mechanism of flower senescence has not yet been addressed. Here, we present a chromosome-scale genome assembly for G. paniculata with a total size of 749.58 Mb. Whole-genome duplication signatures unveil two major duplication events in its evolutionary history: an ancient one occurring before the divergence of Caryophyllaceae and a more recent one shared with Dianthus caryophyllus. The integrative analyses combining genomic and transcriptomic data reveal the mechanisms regulating floral development and ethylene response of G. paniculata. The reduction of AGAMOUS expression probably caused by sequence polymorphism and the mutation in miR172 binding site of PETALOSA are associated with the double flower formation in G. paniculata. The low expression of ETHYLENE RESPONSE SENSOR (ERS) and the reduction of downstream ETHYLENE RESPONSE FACTOR (ERF) gene copy number collectively lead to the ethylene insensitivity of G. paniculata, affecting flower senescence and making it capable of making dried flowers. This study provides a cornerstone for understanding the underlying principles governing floral development and flower senescence, which could accelerate the molecular breeding of the Caryophyllaceae species.
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