de Oliveira Natália Padilha, Gesteira Gabriel de Siqueira, Padilha de Oliveira Maria do Socorro, Davide Lisete Chamma
Departmento de Biologia, Universidade Federal de Lavras, Campus Universitário, Caixa Postal 3037, CEP 37200-000, Lavras, MG, Brazil Universidade Federal de Lavras Lavras Brazil.
Embrapa Amazônia Oriental, CPATU, 66095-903, Belém, PA, Brazi Embrapa Amazônia Oriental Belém Brazil.
Comp Cytogenet. 2024 May 8;18:59-72. doi: 10.3897/compcytogen.18.117597. eCollection 2024.
The genus Martius, 1823 (Arecaceae) includes five species commonly used in Amazonia, especially for their fruits. Little is known about the cytogenetic characteristics and DNA amounts of these species, except for (Martius, 1823). This study characterized and compared the types of interphase nuclei, the chromosome sets, and estimated the nuclear DNA amounts of (Martius, 1823), , (Martius, 1823), (H. Karsten, 1857) and (Martius, 1823). Standard cytogenetic analyses and estimates of the nuclear DNA amount by flow cytometry were carried out. These are the first reports of chromosome numbers and DNA amounts, except for , as is the description of the chromatin distribution in interphase nuclei and karyotype for all species. All species presented 2n = 36, confirming the previous report for . Differences between karyotype formulas and the positioning of secondary constrictions were observed. There were no significant differences for the nuclear DNA amounts among species. The constancy in chromosome number and variations in karyotype formulas suggest the occurrence of chromosome rearrangement as an important mechanism in speciation.
马蒂乌斯属（1823年，棕榈科）包含5个在亚马逊地区常用的物种，尤其是因其果实而闻名。除了[物种名称]（马蒂乌斯，1823年）外，对于这些物种的细胞遗传学特征和DNA含量知之甚少。本研究对[物种名称]（马蒂乌斯，1823年）、[物种名称]、[物种名称]（马蒂乌斯，1823年）、[物种名称]（H. 卡斯滕，1857年）和[物种名称]（马蒂乌斯，1823年）的间期核类型、染色体组进行了特征描述和比较，并估计了其核DNA含量。采用了标准的细胞遗传学分析方法，并通过流式细胞术估计核DNA含量。除了[物种名称]外，这些是关于染色体数目和DNA含量的首次报道，也是所有物种间期核染色质分布和核型的描述。所有物种均呈现2n = 36，证实了之前关于[物种名称]的报道。观察到核型公式和次缢痕位置存在差异。物种间核DNA含量无显著差异。染色体数目的恒定和核型公式的变化表明染色体重排是[物种名称]物种形成的重要机制。
