Contribution to the knowledge of genome size variation in Calendula L. (Asteraceae) with special focus on the SW Mediterranean region

Ana Gonçalves, H. Oliveira, J. Loureiro, S. Castro, Maria Eduarda Fidalgo, Teresa Ribeiro, Ahmed Ouhammoud, R. Amirouche, L. Morais-Cecílio, C. Santos, P. Silveira
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引用次数: 1

Abstract

Abstract Calendula is one of the most taxonomically complex genera within the Asteraceae family due to hybridization, polyploidization events, and production of a highly variable morphology of the achenes. Considering the complexity of Calendula, this study was conducted to extend the understanding of the relationships between SW Mediterranean taxa, and assess the relationships between genome size and chromosome number, ploidy level and life cycle in 77 populations covering 14 taxa. Genome size estimations are provided for the first time for five species and for three putative new undescribed species. Mean 2C values differed up to 6-fold among different euploid species (from 1.37 pg in diploid to 8.26 pg in octoploid populations). 1Cx-values varied 2.07-fold (between 0.68 pg and 1.41 pg). Mean 1Cx genome size revealed significant differences between different ploidy levels. Genome size variation is a significant factor for explaining the relationships within Calendula, and individuals not fitting the current classification were found and should be analysed in detail in future studies.
对菊科植物金盏菊(Calendula L.)基因组大小变异的贡献,特别是对地中海西南部地区的研究
摘要金盏菊是菊科植物中分类学最复杂的属之一,由于其杂交、多倍体事件和瘦果高度可变的形态产生。考虑到金盏菊属植物的复杂性,本研究对地中海西南部14个分类群77个居群的金盏菊基因组大小与染色体数目、倍性水平和生命周期的关系进行了研究。本文首次对5个物种和3个假定的未被描述的新物种进行了基因组大小估计。平均2C值在不同的整倍体种群之间差异高达6倍(从二倍体的1.37 pg到八倍体种群的8.26 pg)。1x值变化了2.07倍(在0.68和1.41 pg之间)。平均1Cx基因组大小在不同倍性水平之间存在显著差异。基因组大小的变异是解释金盏菊内部关系的重要因素,不符合当前分类的个体已被发现,应在未来的研究中进行详细分析。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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