Alstroemeria species present a well-conserved and asymmetric karyotype. The genus is divided into a Chilean clade, rich in heterochromatin, and a Brazilian clade, poor in heterochromatin. We investigated the distribution of the main repetitive sequences in the chromosomes of the Brazilian species A. longistaminea (2n = 16 + 0-6B) aiming to evaluate the role played by these sequences on the structural organization of the karyotype. In situ hybridization of the three most abundant retrotransposons, corresponding to ~ 45% of the genome, was uniformly distributed. Three satellite DNA sequences, representing near half of the whole satellite fraction (1.93% of the genome), were mainly concentrated on the heterochromatin and one of them painted the whole B chromosome. Noteworthy, some satellites were located on euchromatin, either dispersed or concentrated in clusters along the chromosomes, revealing a G-band-like pattern. The two satellites that presented more C-band- and G-band-like labeling were also hybridized in situ in two other Alstroemeria species. They revealed astonishing similar patterns of distribution, indicating an unusually structural karyotype conservation among Brazilian species.

六出属物种呈现出保守且不对称的核型。该属分为富含异染色质的智利进化枝和缺乏异染色质的巴西进化枝。我们调查了巴西物种A. longistaminea (2 n= 16 + 0-6B) 旨在评估这些序列对核型结构组织所起的作用。三个最丰富的反转录转座子的原位杂交，对应于约 45% 的基因组，是均匀分布的。三个卫星 DNA 序列，占整个卫星部分的近一半（基因组的 1.93%），主要集中在异染色质上，其中一个描绘了整个 B 染色体。值得注意的是，一些卫星位于常染色质上，沿着染色体分散或集中成簇，显示出类似 G 带的模式。呈现更多 C 波段和 G 波段标记的两颗卫星也在另外两颗六出花中原位杂交物种。他们揭示了惊人的相似分布模式，表明巴西物种之间存在异常的结构核型保护。