In apomictic pseudogamous reproduction, the asexual embryo requires a sexual origin of the endosperm for its nutrition; hence, fertilization is necessary for seed development to occur. Male gametophyte functionality in apomictic polyploids is highly variable and often linked to low values of pollen grain viability. This work evaluates pollen grain development and functional attributes in Psidium cattleyanum, a polyploid and apomictic pseudogamic species. We consider pollen grain ontogeny and pollen grain morphology, size, and viability in two ploidy levels, octoploid and heptaploid. Plants with different ploidy levels showed variation in the duration of microsporogenesis and the size of microspores. Microsporogenesis exhibited several abnormalities in all studied plants, but more frequently in heptaploids; cytomixis was detected in meiosis. Psidium cattleyanum pollen grains registered morphotypes typical of the Myrtaceae family and other heteropolar forms that were not previously described for the genus. Pollen grain size was heterogeneous but larger in octoploid plants. Pollen viability was low and varied both intra- and between ploidies; pollen morphotypes contribute differently to pollen viability depending on the ploidy of the plant. Several abnormalities detected during pollen grain ontogeny affect pollen grains performance. Polyploidy is proposed as the leading cause of meiosis abnormalities. Further, variations in pollen grain viability and final pollen size and morphology found in different plants suggest that ploidy levels can affect these attributes differently.

在无融合生殖假配偶生殖中，无性胚胎需要胚乳的有性来源来获取营养；因此，种子发育需要施肥。无融合生殖多倍体中的雄配子体功能高度可变，通常与花粉粒活力的低值有关。这项工作评估了Psidium cowyanum 的花粉粒发育和功能属性，一种多倍体和无融合生殖假配种。我们在两个倍性水平（八倍体和七倍体）中考虑花粉粒个体发育和花粉粒形态、大小和活力。具有不同倍性水平的植物在小孢子发生的持续时间和小孢子的大小方面表现出变化。小孢子发生在所有研究的植物中都表现出一些异常，但在七倍体中更常见。在减数分裂中检测到细胞混合。牛蒡花粉粒记录了桃金娘科的典型形态类型和以前没有描述过的其他异极形式。八倍体植物的花粉粒大小是异质的，但较大。花粉活力低并且在倍性内和倍性之间变化；花粉形态型对花粉活力的贡献取决于植物的倍性。在花粉粒个体发育过程中检测到的几种异常会影响花粉粒的性能。多倍体被认为是减数分裂异常的主要原因。此外，在不同植物中发现的花粉粒活力和最终花粉大小和形态的变化表明倍性水平可以不同地影响这些属性。