数字农科院2.0

Multi-integrated genomic data for Passiflora foetida provides insights into genome size evolution and floral development in Passiflora

文献类型： 外文期刊

作者： Yi Zou;Jie Wang;Dan Peng;Xiaoni Zhang;Luke R. Tembrock;Jinliang Yang;Jianli Zhao;Hong Liao;Zhiqiang Wu

作者机构：

关键词： （1-1-1）Floral organ;Genome assembly;MADS-box;Passiflora foetida;Transposable elements

期刊名称： Molecular Horticulture

ISSN： 2730-9401

年卷期： 2024 年 3 卷 1 期

页码：

收录情况： SCIE（2024版）

摘要： Passiflora is a plant genus known for its extremely distinctive and colorful flowers and a wide range of genome size variation. However, how genome characteristics are related to flower traits among Passiflora species remains poorly understood. Here, we assembled a chromosome-scale genome of P. foetida, which belongs to the same subgenus as the commercial passionfruit P. edulis. The genome of P. foetida is smaller (424.16 Mb) and contains fewer copies of long terminal repeat retrotransposons (LTR-RTs). The disparity in LTR-RTs is one of the main contributors to the differences in genome sizes between these two species and possibly in floral traits. Additionally, we observed variation in insertion times and copy numbers of LTR-RTs across different transposable element (TE) lineages. Then, by integrating transcriptomic data from 33 samples (eight floral organs and flower buds at three developmental stages) with phylogenomic and metabolomic data, we conducted an in-depth analysis of the expression, phylogeny, and copy number of MIKC-type MADS-box genes and identified essential biosynthetic genes responsible for flower color and scent from glandular bracts and other floral organs. Our study pinpoints LRT-RTs as an important player in genome size variation in Passiflora species and provides insights into future genetic improvement. Graphical Abstract: [Figure not available: see fulltext.].

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