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首页> 外文期刊>International journal of plant sciences >POLLEN INSIGHTS INTO APOMICTIC AND SEXUAL MICONIA (MICONIEAE, MELASTOMATACEAE)
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POLLEN INSIGHTS INTO APOMICTIC AND SEXUAL MICONIA (MICONIEAE, MELASTOMATACEAE)

机译：花粉对无性生殖和性无性生殖的了解（MICONIEAE，MLASTOMATACEAE）

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摘要

The genus Miconia, Melastomataceae, has been highlighted for its high proportion of apomictic species, in which the occurrence of low pollen grain viability is commonly recorded. In this study, we compared aspects of pollen development and viability and ploidy level in a sexual species, Miconia pepericarpa, and an apomictic species, Miconia fallax, and investigated the possible causes of pollen grain sterility in apomictic species. Abnormal meiosis was observed only in apomictic M. fallax and leads to the formation of inviable pollen grains, often with little or no cytoplasmic content. Furthermore, the apomictic species is polyploid, and therefore, chromosomal imbalance would be expected. Symmetric mitotic division was found only in M. fallax, also resulting in inviable pollen grains, usually with cytoplasm content but without generative cell differentiation. At the end of development, the apomictic species also displays another difference when compared with the sexual species: the generative cell does not become fusiform but, rather, maintains a spherical shape. It is unknown whether the generative cell shape may interfere with its function.
机译：Miconia属的Melastomataceae因其无融合生殖物种比例高而突出，其中通常记录到花粉粒活力较低。在这项研究中，我们比较了有性物种Miconia pepericarpa和无融合生殖物种Miconia fallax的花粉发育，活力和倍性水平，并调查了无融合生殖物种中花粉粒不育的可能原因。仅在无融合生殖的M.fallax中观察到减数分裂异常，并导致形成不可存活的花粉粒，通常很少或没有胞质含量。此外，无融合生殖物种是多倍体，因此预期染色体失衡。对称的有丝分裂分裂仅存在于M. fallax，也导致无法繁殖的花粉粒，通常具有细胞质含量，而没有生殖细胞分化。在发育结束时，无性生殖物种与有性物种相比还表现出另一个差异：生殖细胞不会变成梭形，而是保持球形。尚不清楚生成细胞的形状是否会干扰其功能。

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  • 来源
    《International journal of plant sciences》 |2013年第5期|760-768|共9页
  • 作者

    Ana Paula Souza Caetano; Simone Padua Teixeira; Eliana Regina Forni-Martins; Sandra Maria Carmello-Cuerreiro;

  • 作者单位

    Departamento de Biologia Vegetal, Institute) de Biologia, Universidade Estadual de Campinas, 13083-970, Campinas, Sao Paulo, Brazil,Departamento de Ciencias Farmaceuticas de Ribeirao Preto, Faculdade de Ciencias Farmaceuticas de Ribeirao Preto, Universidade de Sao Paulo, 14040-903, Ribeirao Preto, Sao Paulo, Brazil;

    Departamento de Ciencias Farmaceuticas de Ribeirao Preto, Faculdade de Ciencias Farmaceuticas de Ribeirao Preto, Universidade de Sao Paulo, 14040-903, Ribeirao Preto, Sao Paulo, Brazil;

    Departamento de Biologia Vegetal, Institute) de Biologia, Universidade Estadual de Campinas, 13083-970, Campinas, Sao Paulo, Brazil;

    Departamento de Biologia Vegetal, Institute) de Biologia, Universidade Estadual de Campinas, 13083-970, Campinas, Sao Paulo, Brazil;

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  • 正文语种 eng
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  • 关键词

    apomixis; pollen sterility; polyploidy; abnormal meiosis; symmetric mitosis;

    机译：无融合生殖花粉不育多倍体减数分裂异常对称有丝分裂;

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