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首页> 外文期刊>Plant Systematics and Evolution >Diplospory and obligate apomixis in Miconia albicans (Miconieae, Melastomataceae) and an embryological comparison with its sexual congener M-chamissois
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Diplospory and obligate apomixis in Miconia albicans (Miconieae, Melastomataceae) and an embryological comparison with its sexual congener M-chamissois

机译：白色念珠菌（Miconieae，Melastomataceae）的双亲和专性无融合生殖及其与性同源M-chamissois的胚胎学比较

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摘要

Apomixis, or asexual reproduction through seeds, has been reported for species of the tribe Miconieae, Melastomataceae, but details of the process have yet to be described. We analyzed and compared sporogenesis and gametogenesis in the apomictic Miconia albicans and the sexual M. chamissois. The results point to some differences between species, which were related to the apomictic process. In M. albicans microsporogenesis, problems during meiosis and degeneration of its products led to total pollen sterility, while M. chamissois presented normal bicellular pollen grains in the mature anther. The absence or abnormality of meiosis in M. albicans megasporogenesis led to the formation of an unreduced embryo sac and also to egg cell parthenogenesis, which gave rise to the apomictic embryo. Embryo and endosperm development were autonomous, resulting in seeds and fruits independent of pollination and fertilization. Thus, in this species, apomixis can be classified as diplosporic and obligate. In contrast, meiosis was as expected in the sexual M. chamissois, and led to the development of a reduced embryo sac. Despite the divergent pathways, many embryological characteristics were similar between the studied species and other Melastomataceae and they seem to be conservative character states for the family.
机译：据报道，Miconieae，Melastomataceae部落的物种无融合生殖或通过种子无性繁殖，但该过程的细节尚未描述。我们分析和比较了无融合性白色念珠菌和有性的M. chamissois的孢子发生和配子发生。结果表明物种之间存在一些差异，这与无融合生殖过程有关。在白色念珠菌的微孢子发生中，减数分裂和其产物的退化期间的问题导致了完全的花粉不育，而chamissois在成熟的花药中呈现出正常的双细胞花粉粒。在白色念珠菌大孢子发生中减数分裂的缺乏或异常导致未还原的胚囊的形成以及卵细胞孤雌生殖，这导致了无融合生殖的胚胎。胚和胚乳的发育是自主的，导致种子和果实独立于授粉和受精。因此，在该物种中，无融合生殖可分类为二倍体和专性。相反，减数分裂在有性的M. chamissois中如预期的那样，并导致胚囊减少。尽管途径不同，但研究物种与其他桔梗科植物的许多胚胎学特征相似，并且似乎是该家族的保守性状。

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