Disruption of endosperm development is a major cause of hybrid seed inviability between Mimulus guttatus and M. nudatus
Disruption of endosperm development is a major cause of hybrid seed inviability between Mimulus guttatus and M. nudatus
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胚乳发育的破坏是 Mimulus guttatus 和 M. nudatus 杂交种子无法存活的主要原因
DOI：
10.1101/029223
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
R. Franks
中科院分区：
文献类型：
--
作者：
E. Oneal;J. Willis;R. Franks
居群内发育机制的差异可能导致杂种发育失败，并可能是被子植物物种形成的驱动因素。我们研究了Mimulus guttatus和密切相关的蛇纹特有种Mimulus guttatus的胚乳和胚胎发育模式。nudatus，并将它们与正反交种子进行比较。我们解决是否在杂交种子发育中断这些同域类群之间的生殖隔离的主要来源。M. guttatus和M.裸子植物胚乳和胚发育的模式和时间不同。一些杂交种子表现出胚乳发育的早期中断，并且完全不能存活，而另一些杂交种子最初发育相对正常，但后来表现出受损的胚乳增殖和低萌发成功率。这些发育模式反映在成熟的杂交种子中，其要么小而平（表明几乎没有胚乳），要么皱缩（表明胚乳体积减少）。杂种种子的无活力形成了M. guttatus和M.裸体我们揭示了M内密切相关的物种之间的发育变异的程度。guttatus物种复合体的研究，并为M. guttatus和M.裸体
Divergence of developmental mechanisms within populations may lead to hybrid developmental failure, and may be a factor driving speciation in angiosperms. We investigate patterns of endosperm and embryo development in Mimulus guttatus and the closely related, serpentine endemic M. nudatus, and compare them to those of reciprocal hybrid seed. We address whether disruption in hybrid seed development is the primary source of reproductive isolation between these sympatric taxa. M. guttatus and M. nudatus differ in the pattern and timing of endosperm and embryo development. Some hybrid seed exhibit early disruption of endosperm development and are completely inviable, while others develop relatively normally at first, but later exhibit impaired endosperm proliferation and low germination success. These developmental patterns are reflected in mature hybrid seed, which are either small and flat (indicating little to no endosperm), or shriveled (indicating reduced endosperm volume). Hybrid seed inviability forms a potent reproductive barrier between M. guttatus and M. nudatus. We shed light on the extent of developmental variation between closely related species within the M. guttatus species complex, an important ecological model system, and provide a partial mechanism for the hybrid barrier between M. guttatus and M. nudatus.
DOI：
10.1111/j.1469-8137.2009.03087.x
发表时间：
2010-04
期刊：
The New phytologist
影响因子：
--
作者：
Birchler JA;Veitia RA
通讯作者：
Veitia RA
DOI：
10.1111/nph.12968
发表时间：
2014-12
期刊：
The New phytologist
影响因子：
--
作者：
Yuan YW;Sagawa JM;Frost L;Vela JP;Bradshaw HD Jr
通讯作者：
Bradshaw HD Jr