Apomixis in Eulaliopsis binata: characterization of reproductive mode and endosperm development
Apomixis in Eulaliopsis binata: characterization of reproductive mode and endosperm development
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DOI：
10.1007/s00497-007-0051-y
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发表时间：
2007-06
影响因子：
--
通讯作者：
Jialing Yao;Yun Zhou;Chun-Gen Hu
中科院分区：
文献类型：
--
作者：
Jialing Yao;Yun Zhou;Chun-Gen Hu
无融合生殖改变了传统的植物有性生殖方式，产生了具有基本上是克隆胚的种子，其固定杂种优势的能力引起了生物学家和植物育种家的广泛兴趣。龙须草（Eulaliopsis binata）是禾本科植物龙须草属（Eulaliopsis binata）的一个新的无融合生殖种。 根据生物型的不同，发现有性胚囊的频率为1-4%。用流式细胞仪检测成熟种子的核DNA含量（C值），证明胚乳是不经受精而自发形成的，并对E. binata表现出不同程度的无融合生殖。宽叶型表现专性无融合生殖，而细叶型和红茎型表现兼性无融合生殖。此外，在子房壁、珠被和珠心细胞上观察到不定胚，表明E。binata通过无孢子生殖和不定胚生殖的混合产生胚。
Apomixis represents an alteration of classical sexual plant reproduction to produce seeds with essentially clonal embryos, stimulating wide interest from biologists and plant breeders for its ability to fix heterosis. Eulaliopsis binata (Poaceae), is identified here as a new apomictic species. Sexual embryo sacs were found with a frequency of 1–4% depending on the biotype. The DNA content of nuclei (C-value) in mature seeds was screened by flow cytometry (FCSS) and demonstrated that the endosperm was derived autonomously without fertilization and the three biotypes of E. binata showed varying degrees of apomixis. The Wide-leaf type showed obligate apomixis whereas the Slender-leaf and the Red-haulm type displayed facultative apomixis. In addition, adventitious embryos were observed on the wall of ovary, integument and nucellus cells, indicating that E. binata produces embryos via a mixture of apospory and adventitious embryony.