Gradual genome size evolution and polyploidy in Allium from the Qinghai-Tibetan Plateau

doi:10.1093/aob/mcab155

KIB OpenIR

	Gradual genome size evolution and polyploidy in Allium from the Qinghai-Tibetan Plateau
	Wang,Guangyan ; Zhou,Ning ; Chen,Qian ; Yang,Ya; Yang,Yongping; Duan,Yuanwen
	2021
发表期刊	ANNALS OF BOTANY
ISSN	0305-7364
摘要	Background and Aims Genome size is an important plant trait, with substantial interspecies variation. The mechanisms and selective pressures underlying genome size evolution are important topics in evolutionary biology. There is considerable diversity in Allium from the Qinghai-Tibetan Plateau, where genome size variation and related evolutionary mechanisms are poorly understood.Methods We reconstructed the Allium phylogeny using DNA sequences from 71 species. We also estimated genome sizes of 62 species, and determined chromosome numbers in 65 species. We examined the phylogenetic signal associated with genome size variation, and tested how well the data fit different evolutionary models. Correlations between genome size variations and seed mass, altitude and 19 bioclimatic factors were determined.Key Results Allium genome sizes differed substantially between species and within diploids, triploids, tetraploids, hexaploids and octaploids. Size per monoploid genome (1Cx) tended to decrease with increasing ploidy levels. Allium polyploids tended to grow at a higher altitude than diploids. The phylogenetic tree was divided into three evolutionary branches. The genomes in Clade I were mostly close to the ancestral genome (18.781 pg) while those in Clades II and III tended to expand and contract, respectively. A weak phylogenetic signal was detected for Allium genome size. Furthermore, significant positive correlations were detected between genome size and seed mass, as well as between genome size and altitude. However, genome size was not correlated with 19 bioclimatic variables.Conclusions Allium genome size shows gradual evolution, followed by subsequent adaptive radiation. The three well-supported Allium clades are consistent with previous studies. The evolutionary patterns in different Allium clades revealed genome contraction, expansion and relative stasis. The Allium species in Clade II may follow adaptive radiation. The genome contraction in Clade III may be due to DNA loss after polyploidization. Allium genome size might be influenced by selective pressure due to the conditions on the Qinghai-Tibetan Plateau (low temperature, high UV irradiation and abundant phosphate in the soil).
关键词	Genome size evolution polyploidy adaptation ecological factors seed mass Allium Qinghai-Tibetan Plateau NUCLEAR-DNA CONTENT CONSTRAINT HYPOTHESIS FLOW-CYTOMETRY PLANT TRAITS C-VALUE MECHANISMS ASTERACEAE PHYLOGENY AMARYLLIDACEAE INFORMATION
DOI	10.1093/aob/mcab155
WOS记录号	WOS:000767464600001
引用统计
文献类型	期刊论文
条目标识符	http://ir.kib.ac.cn/handle/151853/73262
专题	中国科学院昆明植物研究所
作者单位	1.Chinese Acad Sci, Kunming Inst Bot, Germplasm Bank Wild Species, Kunming 650201, Yunnan, Peoples R China 2.Chinese Acad Sci, Inst Tibetan Plateau Res Kunming, Kunming 650201, Yunnan, Peoples R China
推荐引用方式 GB/T 7714	Wang,Guangyan,Zhou,Ning,Chen,Qian,et al. Gradual genome size evolution and polyploidy in Allium from the Qinghai-Tibetan Plateau[J]. ANNALS OF BOTANY,2021.
APA	Wang,Guangyan,Zhou,Ning,Chen,Qian,Yang,Ya,Yang,Yongping,&Duan,Yuanwen.(2021).Gradual genome size evolution and polyploidy in Allium from the Qinghai-Tibetan Plateau.ANNALS OF BOTANY.
MLA	Wang,Guangyan,et al."Gradual genome size evolution and polyploidy in Allium from the Qinghai-Tibetan Plateau".ANNALS OF BOTANY (2021).