Occurrence of plastids in the sperm cells of Caprifoliaceae: Biparental plastid inheritance in angiosperms is unilaterally derived from maternal inheritance
Occurrence of plastids in the sperm cells of Caprifoliaceae: Biparental plastid inheritance in angiosperms is unilaterally derived from maternal inheritance
复制标题
忍冬科精子细胞中质体的出现：被子植物中的双亲质体遗传是单方面源自母系遗传的
DOI：
10.1093/pcp/pcn069
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发表时间：
2008-06-01
影响因子：
4.9
通讯作者：
Sodmergen
中科院分区：
文献类型：
--
作者：
Hu, Yingchun;Zhang, Quan;Sodmergen
人们普遍认为细胞器是从母系遗传的。然而，相当多的被子植物中的质体基因组似乎是双亲遗传的。目前还不清楚基因组的双亲遗传是如何以及为何被激活的。在这里，我们检测到传统忍冬科的精子细胞（双亲遗传的细胞先决条件）中广泛存在质体。在采样的 12 个属中，六道木属、二佩尔塔属、七子属、Kolkwitzia、Leycesteria、Linnaea、Lonicera、Symphoricarpos、Triosteum 和 Weigela 的精子细胞拥有可遗传的质体。其他属，接骨木属和荚莲属植物，精子细胞中缺乏质体。有趣的是，一些忍冬科精子细胞中质体的这种排除似乎与续断目系统发育的分歧有关。对佛罗里达锦带花的仔细检查表明，质体和质体 DNA 在生殖细胞中高度复制。这意味着精子细胞中质体的出现涉及细胞机制。因为这种机制必须增强通过父系谱系的质体传递的强度，并且在表现出双亲或潜在双亲质体遗传的物种中普遍存在，所以我们推测双亲质体遗传学可能是被子植物的衍生性状。这与我们使用最近发现的潜在质体遗传模式的物种进行的扩展系统发育分析是一致的。结果表明，基部和早期被子植物具有母本质体传播，而所有潜在的双亲传播都发生在树的末端分支上。因此，与以前的研究不同，我们认为被子植物的双亲质体遗传是在被子植物进化晚期从母本传播模式单方面转变的。
It is widely held that organelles inherit from the maternal lineage. However, the plastid genome in quite a few angiosperms appears to be biparentally transmitted. It is unclear how and why biparental inheritance of the genome became activated. Here, we detected widespread occurrence of plastids in the sperm cells (a cellular prerequisite for biparental inheritance) of traditional Caprifoliaceae. Of the 12 genera sampled, the sperm cells of Abelia, Dipelta, Heptacodium, Kolkwitzia, Leycesteria, Linnaea, Lonicera, Symphoricarpos, Triosteum and Weigela possessed inheritable plastids. The other genera, Sambucus and Viburnum, lacked plastids in sperm cells. Interestingly, such exclusion of plastids in the sperm cells of some Caprifoliaceae appeared to be associated with the divergence of Dipsacales phylogeny. Closer examination of Weigela florida revealed that both plastids and plastid DNA were highly duplicated in the generative cells. This implies that the appearance of plastids in sperm cells involved cellular mechanisms. Because such mechanisms must enhance the strength of plastid transmission through the paternal lineage and appear ubiquitous in species exhibiting biparental or potential biparental plastid inheritance, we presume that biparental plastid genetics may be a derived trait in angiosperms. This is consistent with our extended phylogenetic analysis using species with recently discovered modes of potential plastid inheritance. The results show that basal and early angiosperms have maternal plastid transmission, whereas all potential biparental transmission occurs at terminal branches of the tree. Thus, unlike previous studies, we suggest that biparental plastid inheritance in angiosperms was unilaterally converted from the maternal transmission mode during late angiosperm evolution.