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Endopolyploidy is associated with leaf functional traits and climate variation in Arabidopsis thaliana
American Journal of Botany ( IF 3 ) Pub Date : 2020-07-01 , DOI: 10.1002/ajb2.1508
Evan K Pacey 1 , Hafiz Maherali 1 , Brian C Husband 1
Affiliation  

PREMISE Endopolyploidy is widespread throughout the tree of life and is especially prevalent in herbaceous angiosperms. Its prevalence in this clade suggests that endopolyploidy may be adaptive, but its functional roles are poorly understood. To address this gap in knowledge, we explored whether endopolyploidy was associated with climatic factors and correlated with phenotypic traits related to growth. METHODS We sampled stem and leaf endopolyploidy in 56 geographically separated accessions of Arabidopsis thaliana grown in a common garden to explore species variation and to determine whether this variation was correlated with climatic variables and other plant traits. RESULTS Stem endopolyploidy was not associated with climate or other traits. However, leaf endopolyploidy was significantly higher in accessions from drier and colder environments. Moreover, leaf endopolyploidy was positively correlated with apparent chlorophyll content and leaf dry mass. CONCLUSIONS Endopolyploidy may have a functional role in the storage of chloroplasts and starch, and it may offer an adaptive avenue of tissue growth in cold and dry environments.

中文翻译:

内多倍体与拟南芥叶片功能性状和气候变化有关

前提 内多倍体在整个生命之树中广泛存在,在草本被子植物中尤为普遍。它在这个进化枝中的流行表明内多倍体可能具有适应性,但对其功能作用知之甚少。为了解决这一知识差距,我们探讨了内多倍体是否与气候因素相关,并与与生长相关的表型特征相关。方法我们对种植在一个公共花园中的 56 个地理上分开的拟南芥种质进行茎叶内多倍体采样,以探索物种变异并确定这种变异是否与气候变量和其他植物性状相关。结果 茎内多倍体与气候或其他性状无关。然而,来自较干燥和较冷环境的种质的叶片内多倍体显着更高。此外,叶片内多倍体与表观叶绿素含量和叶片干重呈正相关。结论内多倍体可能在叶绿体和淀粉的储存中具有功能性作用,它可能为寒冷和干燥环境中的组织生长提供适应性途径。
更新日期:2020-07-01
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