Nuclear DNA contents of Echinchloa crus-galli and its Gaussian relationships with environments

文献类型： 外文期刊

第一作者： Li, Dan-Dan

作者： Li, Dan-Dan;Guo, Shui-Liang;Zhou, Ping;Lou, Yu-Xia;Lu, Yong-Liang;Yin, Li-Ping

作者机构：

关键词： Bioclimatic variables;Geographical gradient;Gaussian model;Echinochloa crus-Galli;Flow cytometry;Linear relationship;Nuclear DNA content

期刊名称：ACTA OECOLOGICA-INTERNATIONAL JOURNAL OF ECOLOGY （ 影响因子：1.674； 五年影响因子：1.845 ）

ISSN：

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收录情况： SCI

摘要： Previous studies on plant nuclear DNA content variation and its relationships with environmental gradients produced conflicting results. We speculated that the relationships between nuclear DNA content of a widely-distributed species and its environmental gradients might be non-linear if it was sampled in a large geographical gradient. Echinochloa crus-galli (L) P. Beauv. is a worldwide species, but without documents on its intraspecific variation of nuclear DNA content. Our objectives are: 1) to detect intraspecific variation scope of E. crus-galli in its nuclear DNA content, and 2) to testify whether nuclear DNA content of the species changes with environmental gradients following Gaussian models if its populations were sampled in a large geographical gradient. We collected seeds of 36 Chinese populations of E. crus-galli across a wide geographical gradient, and sowed them in a homogeneous field to get their offspring to determine their nuclear DNA content. We analyzed the relationships of nuclear DNA content of these populations with latitude, longitude, and nineteen bioclimatic variables by using Gaussian and linear models. (1) Nuclear DNA content varied from 2.113 to 2.410 pg among 36 Chinese populations of E. crus-galli, with a mean value of 2.256 pg. (2) Gaussian correlations of nuclear DNA content (y) with geographical gradients were detected, with latitude (x) following y = 2.2923*e (-(x-249360)2/2.6379452) (r = 0.546, P < 0.001), and with longitude (x) following y = 2.2933*e(-(x-116.1801)2/2.4474502) (r = 0.672, P < 0.001). (3) Among the nineteen bioclimatic variables, except temperature isothermality, precipitations of the wettest month, the wettest quarter and the warmest quarter, the others could be better fit with nuclear DNA content by using Gaussian models than by linear models. There exists intra-specific variation among 36 Chinese populations of E. crus-galli, Gaussian models could be applied to fit the correlations of its Nuclear DNA content with geographical and most bioclimatic gradients. (C) 2017 Elsevier Masson SAS. All rights reserved.

分类号： Q14

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