We describe the chromosome numbers and genome sizes of species of the cryptanthoid complex of Bromeliaceae in a phylogenetic framework and their relationship with habitat preferences. The 2C DNA contents varied 2.13-fold among species, ranging from 0.76 to 1.66 pg. A significant difference in DNA content was found among Cryptanthus, Hoplocryptanthus and Rokautskyia. Moreover, species from campos rupestres and the Atlantic Forest had lower and higher genome size values, respectively. The smaller genome sizes of Hoplocryptanthus spp. from campos rupestres may be related with the large genome constraint. The species show a highly conserved ploidy (with 2n = 32 and 34), although the genome sizes varied considerably. The observed variation in chromosome numbers seems to be influenced by dysploidy, but additional investigations are needed. Our study demonstrates that the genome size variation in the cryptanthoid complex species is not strictly related to the phylogenetic relationships and has probably been influenced by different evolutionary processes.

中文翻译：

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系统发育框架中隐壳类复合体（凤梨科，凤梨科）的基因组大小进化和染色体数目

我们在系统发育框架中描述了凤梨科的隐藻类复合体物种的染色体数目和基因组大小，以及它们与栖息地偏好的关系。2C DNA含量在物种之间变化2.13倍，范围从0.76到1.66 pg。Cryptanthus，Hoplocryptanthus和Rokautskyia之间的DNA含量存在显着差异。此外，来自Campos rupestres和大西洋森林的物种的基因组大小值分别较低和较高。Hoplocryptanthus spp的基因组较小。来自Campos rupestres的基因可能与大的基因组限制有关。该物种显示高度保守的倍性（2 n= 32和34），尽管基因组大小差异很大。观察到的染色体数目变异似乎受到二倍体的影响，但是还需要进一步的研究。我们的研究表明，隐藻类复杂物种中的基因组大小变化与系统发育关系并不严格相关，可能已受到不同进化过程的影响。