Eragrostis curvula, a Model Species for Diplosporous Apomixis.

Eragrostis curvula, a Model Species for Diplosporous Apomixis.
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DOI:
10.3390/plants10091818
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发表时间:
2021-08-31
期刊:
Plants (Basel, Switzerland)
影响因子:
--
通讯作者:
Echenique V
Echenique V
中科院分区:
其他
文献类型:
--
作者:
Carballo J;Zappacosta D;Selva JP;Caccamo M;Echenique V

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Eragrostis curvula (Schrad.) Ness 是一种具有特殊无融合生殖胚囊发育的草,称为画眉草型。无融合生殖是一种无性生殖,无需受精即可产生种子,所产生的后代在遗传上与母本植物相同,并且具有在一代以上固定杂交活力的潜力,以及其他优点。胚囊发育过程中不存在减数分裂,并且仅发生两轮有丝分裂而不是三轮,使得该模型独特且适合转移到经济上重要的作物上。在这篇综述中,我们重点介绍了使用不同技术(例如细胞胚胎学、DNA 甲基化分析、小 RNA 测序、RNA 测序、基因组组装和测序基因分型)在 E. curvula 中无融合生殖知识的进展。主要证据指出,无融合生殖是作为单一孟德尔因子遗传的,并且受到复杂网络控制的遗传和表观遗传机制的调节。有了所有这些信息,我们提出了该草中双孢子无融合生殖的机制模型。 E. curvula 产生的用于研究生殖模式的所有遗传和表观遗传资源将其状态从孤儿转变为特征明确的物种。
Eragrostis curvula (Schrad.) Ness is a grass with a particular apomictic embryo sac development called Eragrostis type. Apomixis is a type of asexual reproduction that produces seeds without fertilization in which the resulting progeny is genetically identical to the mother plant and with the potential to fix the hybrid vigour from more than one generation, among other advantages. The absence of meiosis and the occurrence of only two rounds of mitosis instead of three during embryo sac development make this model unique and suitable to be transferred to economically important crops. Throughout this review, we highlight the advances in the knowledge of apomixis in E. curvula using different techniques such as cytoembryology, DNA methylation analyses, small-RNA-seq, RNA-seq, genome assembly, and genotyping by sequencing. The main bulk of evidence points out that apomixis is inherited as a single Mendelian factor, and it is regulated by genetic and epigenetic mechanisms controlled by a complex network. With all this information, we propose a model of the mechanisms involved in diplosporous apomixis in this grass. All the genetic and epigenetic resources generated in E. curvula to study the reproductive mode changed its status from an orphan to a well-characterised species.
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