Cryogenian Origins of Multicellularity in Archaeplastida
Cryogenian Origins of Multicellularity in Archaeplastida
复制标题
DOI：
10.1093/gbe/evae026
复制
发表时间：
2024-02-22
影响因子：
3.3
通讯作者：
Donoghue，Philip C. J.
中科院分区：
文献类型：
--
作者：
Bowles，Alexander M. C.;Williamson，Christopher J.;Donoghue，Philip C. J.
地球在成冰纪（720至6.35亿年前；Ma）期间受到全球冰川作用的影响，这些事件被用来解释古质体多细胞的起源和第一批陆地植物的辐射。然而，由于分子和化石数据的缺乏，这些环境和生物事件之间的时间关系尚不清楚，妨碍了古质体进化的系统发育和时间尺度的解析。我们根据修订的分子数据集和对化石记录的重新评估，推断出早期古质体进化的时间校准系统发育。系统发育拓扑测试解决了深层古质体关系，识别了绿色植物科的两个分支，并将苔藓目列为绿藻纲的姐妹。我们的分子钟分析推断古质体起源于古元古代晚期至中元古代早期（1712年至1387Ma）。对这棵时间校准树上细胞形态特征的祖先状态重建揭示了跨越成冰纪的许多多细胞独立起源，与成冰纪多细胞假说一致。多细胞红植物出现于 902 至 655 Ma，而冠无植物门（Zygnematophyceae 和 Embryophyta）起源于 796 至 671 Ma，与成冰期植物陆化假说大致相符。我们的分析解决了古质体的时间树，其中祖先多细胞古质体的年龄估计与成冰纪一致，与提出雪球地球在植物进化中的作用的假设相一致。
Earth was impacted by global glaciations during the Cryogenian (720 to 635 million years ago; Ma), events invoked to explain both the origins of multicellularity in Archaeplastida and radiation of the first land plants. However, the temporal relationship between these environmental and biological events is poorly established, due to a paucity of molecular and fossil data, precluding resolution of the phylogeny and timescale of archaeplastid evolution. We infer a time-calibrated phylogeny of early archaeplastid evolution based on a revised molecular dataset and reappraisal of the fossil record. Phylogenetic topology testing resolves deep archaeplastid relationships, identifying two clades of Viridiplantae and placing Bryopsidales as sister to the Chlorophyceae. Our molecular clock analysis infers an origin of Archaeplastida in the late-Paleoproterozoic to early-Mesoproterozoic (1712 to 1387 Ma). Ancestral state reconstruction of cytomorphological traits on this time-calibrated tree reveals many of the independent origins of multicellularity span the Cryogenian, consistent with the Cryogenian multicellularity hypothesis. Multicellular rhodophytes emerged 902 to 655 Ma while crown-Anydrophyta (Zygnematophyceae and Embryophyta) originated 796 to 671 Ma, broadly compatible with the Cryogenian plant terrestrialization hypothesis. Our analyses resolve the timetree of Archaeplastida with age estimates for ancestral multicellular archaeplastids coinciding with the Cryogenian, compatible with hypotheses that propose a role of Snowball Earth in plant evolution.