草地早熟禾有性、无融合和重组植株小孢子发生的变异。

IF 2.1 4区生物学 Q2 Agricultural and Biological Sciences

Caryologia Pub Date : 2022-03-08 DOI:10.36253/caryologia-1375

E. Falistocco, G. Marconi, L. Raggi, D. Rosellini, M. Ceccarelli, E. Albertini

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引用次数: 0

摘要

无融合现象在植物中相当普遍。它被定义为从胚珠的母体组织无性形成的种子，避免了减数分裂和受精的过程。有些种是兼性无融合生殖，在不同程度上通过有性和无融合生殖途径形成种子。这是Poa pratensis的例子，肯塔基蓝草，它通过无孢子假配子兼性无融合繁殖。这种草是研究最多的无分裂系统之一，但一些方面，如雄性减数分裂行为，迄今尚未研究。本文研究了不同繁殖方式的草芥基因型的小孢子发生过程。结果表明，有性植株的减数分裂几乎是规则的，而无融合基因型的减数分裂表现出不同程度的不规则性，这主要是由于细胞融合和I、II分裂的不规则分离。我们的数据没有显示异常的程度和类型与无染色体分裂、无染色体分裂和孤雌生殖的成分之间的明显联系。根据植物的起源，讨论了所研究植物的减数分裂行为。

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Variation of microsporogenesis in sexual, apomictic and recombinant plants of Poa pratensis L.

Apomixis is a rather widespread phenomenon in plants. It is defined as the asexual formation of a seed from the maternal tissues of the ovule, avoiding the processes of meiosis and fertilization. Some species are facultative apomicts and form seeds by means of sexual and apomictic pathways to different extents. This is the case of Poa pratensis, the Kentucky bluegrass, which reproduces by aposporous pseudogamous facultative apomixis. This grass is one of the most studied apomictic systems, however some aspects, such as the male meiotic behavior, have not been so far investigated. In this study the process of microsporogenesis in genotypes of P. pratensis with a different mode of reproduction was investigated. The analysis revealed an almost regular meiosis in the sexual plants whereas apomictic genotypes exhibited different levels of meiotic irregularities, mainly due to cell fusion and irregular segregation in I and II division. Our data did not reveal evident connections between the extent and types of abnormalities and the components of apomixis, apomeiosis and parthenogenesis. The meiotic behavior of the examined plants was discussed in the light of their origin.

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来源期刊

Caryologia 生物-遗传学

CiteScore

1.60

自引率

23.80%

发文量

审稿时长

12 months

期刊介绍： Caryologia is devoted to the publication of original papers, and occasionally of reviews, about plant, animal and human karyological, cytological, cytogenetic, embryological and ultrastructural studies. Articles about the structure, the organization and the biological events relating to DNA and chromatin organization in eukaryotic cells are considered. Caryologia has a strong tradition in plant and animal cytosystematics and in cytotoxicology. Bioinformatics articles may be considered, but only if they have an emphasis on the relationship between the nucleus and cytoplasm and/or the structural organization of the eukaryotic cell.