Understanding the geographic distributions of apomictic plants: a case for a pluralistic approach.
Understanding the geographic distributions of apomictic plants: a case for a pluralistic approach.
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DOI：
10.1080/17550870802351175
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发表时间：
2008-11-01
影响因子：
1.5
通讯作者：
Temsch EM
中科院分区：
文献类型：
--
作者：
Hörandl E;Cosendai AC;Temsch EM
无性生物通常比其有性亲缘生物有更大的分布，在北方半球，分布更北方。这种现象，称为地理孤雌生殖，已被归因于某些类群的倾向，多倍体和/或杂交起源的优势，单亲繁殖的优势，无融合生殖渗入有性生殖，克隆的生态位分化，和生物相互作用。在这里，我们专注于单亲繁殖在殖民地的作用，不同的发展途径，即自主无融合生殖，不需要授粉和受精的胚乳核成功的种子集，和假配子无融合生殖的重要性。一项文献调查表明，地理孤雌生殖经常发生在具有自主无融合生殖的物种中，而与假配生殖的相关性却很少被记录。然而，分类模式（如菊科的优势）和方法的偏差可能会影响估计的地理单性生殖的频率。我们证明，流式细胞术种子筛选（FCSS）是一个强大的方法来评估假配子与自主无融合生殖。我们表明，人口遗传学研究提供了深入了解无融合生殖的遗传多样性，但不给单亲生殖的地理孤雌生殖的唯一解释强有力的支持。分子生物学研究有助于阐明无融合生殖复合体的进化和地理学历史，我们的结论是，需要多学科的研究，以充分了解地理单性生殖的现象。
Asexual organisms usually have larger, and in the Northern Hemisphere, more northern distributions than their sexual relatives. This phenomenon, called geographical parthenogenesis, has been attributed to predispositions in certain taxa, advantages of polyploidy and/or hybrid origin, advantages of uniparental reproduction, introgression of apomixis into sexuals, niche differentiation of clones, and biotic interactions. Here we focus on the role of uniparental reproduction in colonisation, and the importance of different developmental pathways, i.e. autonomous apomixis which does not require pollination and fertilisation of endosperm nuclei for successful seed set, and pseudogamous apomixis which does. A literature survey suggests that geographical parthenogenesis occurs frequently in species with autonomous apomixis, while the correlation with pseudogamy is poorly documented. However, taxonomic patterns (e.g. predominance of Asteraceae) and also methodological bias may influence estimates of frequencies of geographical parthenogenesis. We demonstrate that a flow cytometric seed screen (FCSS) is a powerful method for assessing pseudogamous vs. autonomous apomixis. We show that population genetic studies provide insights into the genetic diversity of apomicts, but do not give strong support for uniparental reproduction being the only explanation of geographical parthenogenesis. Molecular studies help elucidate the evolutionary and biogeographical history of apomictic complexes, and we conclude that multidisciplinary studies are needed to understand fully the phenomenon of geographical parthenogenesis.
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影响因子：
1.9
作者：
BAYER, RJ
通讯作者：
BAYER, RJ
影响因子：
3
作者：
Dobes, C;Mitchell-Olds, T;Koch, MA
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2
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Carrillo, C;Britton, NF;Mogie, M
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3
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Brock, MT
通讯作者：
Brock, MT
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作者：
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通讯作者：
Daehler, CC