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首页> 外文期刊>Ботанический журнал >Speciation potential of the Pilosella agamic complex. 3. Genomic variability in populations and in separate plant progenies.
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Speciation potential of the Pilosella agamic complex. 3. Genomic variability in populations and in separate plant progenies.

机译：皮洛氏菌无菌复合物的形成潜力。 3.种群和不同植物后代的基因组变异性。

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摘要

Genomic variability was observed in apomictic species P. officinarum [Hieracium pilosella], P. vaillantii, P. praealta, P. x vaillantii-praealta and P. echioides-praealta and in the sexual species P. echioides that form a part of the Pilosella agamic complex in the Saratov region. Plants differing in ploidy level (2x-6x) were identified in all populations and in progenies of individual plants. Populations of one and the same species approximately 3 km apart differed in genomic variability. The genomic variability observed is thought to be a result of plant reversion to lower ploidy levels due to parthenogenetic development of embryos from eusporic embryo sacs. It is also connected with genomic instability of hybrid forms. As apomictic forms are mainly pentaploid (they have a chromosomally unbalanced genome), reversion to the dihaploid level occurs by several decreases in chromosome number. Mixoploidy (1x-5x) was frequent in populations of hybridogenic forms. Genomic variability in Pilosella populations varied essentially in different years and depended on environment factors. Even in the species considered predominantly sexual, apomixis in irregular form was observed. This indicates that apomixis is an unstable system of seed reproduction.
机译：在无融合生殖物种P. officinarum [Hieracium pilosella]，P。vaillantii，P。praealta，P。x vaillantii-praealta和P. echioides-praealta以及有性物种P. echioides中，发现了基因组变异。萨拉托夫地区的无学复合体。在所有种群和单个植物的子代中鉴定出倍性水平（2x-6x）不同的植物。相距约3 km的同一物种的种群基因组变异性不同。据认为，观察到的基因组变异性是植物从真核胚囊的孤雌生殖发育到较低倍性水平的结果。它还与杂交形式的基因组不稳定性有关。由于无融合生殖形式主要是五倍体（它们具有染色体不平衡的基因组），因此通过减少染色体数目将其回复到二倍体水平。混合倍性（1x-5x）在杂种形式的种群中很常见。 Pilosella种群的基因组变异性在不同的年份有很大不同，并且取决于环境因素。即使在主要被认为是有性的物种中，也观察到不规则形式的无融合生殖。这表明无融合生殖是种子繁殖的不稳定系统。

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