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Genome size variation and endopolyploidy in the diverse succulent plant family Aizoaceae
Botanical Journal of the Linnean Society ( IF 2.4 ) Pub Date : 2020-06-18 , DOI: 10.1093/botlinnean/boaa034
Robyn F Powell 1, 2, 3, 4, 5 , Laura Pulido Suarez 6 , Anthony R Magee 3, 7 , James S Boatwright 4 , Maxim V Kapralov 8 , Andrew J Young 1
Affiliation  

Aizoaceae are one of the most diverse succulent plant families in the world, with c. 2 400 species, and they are a major component of the Greater Cape Floristic Region of South Africa. Despite this diversity, genome size (GS) has only been recorded in three of the c. 144 genera of Aizoaceae. This study provides the first comprehensive assessment of GS in the family with 109 genera measured (76% of genera). GS (2C) is conserved in Aizoaceae, varying from 0.54 to 6.34 pg (0.53–6.20 Gbp), with a mean of 2.6 pg. No significant differences between GS and the ecological and environmental traits tested were recovered. Infrageneric GS was explored in the most diverse stoneplant genus, Conophytum, and was found to be extremely conserved [0.98–2.24 pg (1C)]. Furthermore, the extent of endoreduplication in Conophytum was determined across 46 species. Leaf and flower tissues of Conophytum are highly polysomatic and ploidy states of 2C–64C were typically observed across the genus, with some instances of 128C. The relatively conserved and small GS measured across Aizoaceae and in Conophytum is possibly linked to the recent and rapid radiation of the family.

中文翻译:

多种肉质植物菊科的基因组大小变异和内多倍体

番杏科是世界上最多样化的肉质植物家族之一,拥有Ç。它是2400种,是南非大开普植物区的主要组成部分。尽管存在这种多样性,但仅在c中的三个中记录了基因组大小(GS)。菊科的144属。这项研究提供了109个属(占属的76%)的家庭中GS的首次综合评估。GS(2C)在菊科中保存,从0.54到6.34 pg(0.53-6.20 Gbp)不等,平均为2.6 pg。GS与所测试的生态和环境特征之间没有显着差异。在种类最广泛的石本植物Conophytum中探索了基础遗传学GS,并且被发现是非常保守的[0.98–2.24 pg(1C)]。此外,确定了在46个物种中牙龈内核复制的程度。康乃馨的叶和花组织是高度多体性的,在整个属中通常观察到2C–64C的倍性状态,有些情况下为128C。整个科和在康乃馨中测得的相对保守和较小的GS可能与该家族的近期和快速辐射有关。
更新日期:2020-08-12
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