生物
基因组大小
莎草科
倍性
基因组
进化生物学
染色体
生物多样性热点
克莱德
遗传学
生物多样性
生态学
系统发育学
基因
禾本科
作者
Tammy L. Elliott,A. Muthama Muasya,Petr Bureš
摘要
It is unclear how widespread polyploidy is throughout the largest holocentric plant lineage-the Cyperaceae. Because of the prevalence of chromosomal fusions and fissions which affect chromosome number but not genome size, it can be impossible to distinguish if individual plants are polyploids in holocentric lineages based on chromosome count data alone. Furthermore, it is unclear how differences in genome size and ploidy levels relate to environmental correlates within holocentric lineages, such as the Cyperaceae.We focus our analyzes on tribe Schoeneae, and more specifically, the southern African clade of Schoenus. We examine broad-scale patterns of genome size evolution in tribe Schoeneae and focus more intensely on determining the prevalence of polyploidy across the southern African Schoenus by inferring ploidy level with the program ChromEvol, as well as interpreting chromosome number and genome size data. We further investigate whether there are relations between genome size / ploidy level and environmental variables across the nutrient-poor and summer-arid Cape biodiversity hotspot.Our results show a large increase in genome size, but not chromosome number, within Schoenus compared to other species in tribe Schoeneae. Across Schoenus, there is a positive relation between chromosome number and genome size, and our results suggest that polyploidy is a relatively common process throughout the southern African Schoenus. At the regional scale of the Cape, we show that polyploids are more often associated with drier locations that have more variation in precipitation between dry and wet months, but these results are sensitive to the classification of ploidy level.Polyploidy is relatively common in the southern African Schoenus, where a positive relation is observed between chromosome number and genome size. Thus, there can be a high incidence of polyploidy in holocentric plants, whose cell division properties differ from monocentrics.
科研通智能强力驱动
Strongly Powered by AbleSci AI