Data From: Evolution of woody plants to the land‐sea interface: The atypical genomic features of mangroves with atypical phenotypic adaptation

How plants adapt and diverge in extreme environments is a key question of plant evolution and ecology. Mangrove invasion of intertidal environments is facilitated by adaptive phenotypes such as aerial roots, salt-secreting leaf, and viviparity, and genomic mechanisms including whole genome duplication and transposable element number reduction. However, a number of mangroves lack these typical phenotypes. The question we ask is whether these phenotypically atypical mangroves also have distinct genomic features? The sibling mangrove species Lumnitzera littorea and Lumnitzera racemosa provide a model to study this question. We sequenced and assembled their genomes to chromosome level, together with a closely related species Combretum micranthum. While most mangroves have small genomes, the genomes of both Lumnitzera species are large (1443 and 1317 Mb) and carry a high proportion of repeat sequences (~75%). Moreover, Lumnitzera species have not undergone post-gamma whole-genome duplication...

植物如何在极端环境中适应与分化，是植物进化与生态学领域的核心研究问题之一。红树林（Mangrove）对潮间带环境的入侵，依托于气生根、泌盐叶片、胎生等适应性表型，以及全基因组复制（whole genome duplication）、转座因子（transposable element）数量缩减等基因组机制。然而，诸多红树林类群并不具备这些典型表型。本研究提出的科学问题为：这些表型非典型的红树林是否同样拥有独特的基因组特征？姊妹红树林物种红榄李（Lumnitzera littorea）与总序榄李（Lumnitzera racemosa）为该问题的研究提供了绝佳模型。我们对这两个物种及其近缘物种细叶榄仁（Combretum micranthum）的基因组进行了测序，并组装至染色体水平。尽管多数红树林的基因组尺寸较小，但红榄李与总序榄李的基因组规模却较大（分别为1443 Mb与1317 Mb），且重复序列占比极高（约75%）。此外，榄李属（Lumnitzera）物种并未经历γ事件后的全基因组复制……