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Australian Journal of Botany Australian Journal of Botany Society
Southern hemisphere botanical ecosystems
RESEARCH ARTICLE

Adaptational significance of variations in DNA methylation in clonal plant Hierochloe glabra (Poaceae) in heterogeneous habitats

Rujin Bian A , Dandan Nie A B , Fu Xing A D , Xiaoling Zhou A , Ying Gao A , Zhenjian Bai A and Bao Liu C
+ Author Affiliations
- Author Affiliations

A Institute of Grassland Science, Key Laboratory of Vegetation Ecology, Ministry of Education, Northeast Normal University, Changchun 130024, China.

B Hunchun Entry–Exit Inspection and Quarantine Bureau, Export Processing Zone, Hunchun 133300, China.

C Key Laboratory of Molecular Epigenetics of Ministry of Education and Institute of Genetics & Cytology, Northeast Normal University, Changchun 130024, China.

D Corresponding author. Email: xingf522@126.com

Australian Journal of Botany 61(4) 274-282 https://doi.org/10.1071/BT12242
Submitted: 23 June 2012  Accepted: 10 April 2013   Published: 24 May 2013

Abstract

As a prominent epigenetic modification, cytosine methylation may play a critical role in the adaptation of plants to different environments. The present study sought to investigate possible impacts of differential levels of nitrogen (N) supply on cytosine-methylation levels of a clonal plant, Hierochloe glabra Trin. (Poaceae). For this purpose, nitrate was applied at concentrations of 0, 0.15, 0.30 and 0.45 g N kg–1 soil, and ecologically important morphological traits were measured. The methylation-sensitive amplification polymorphism method was also conducted to analyse the variations in DNA cytosine methylation. Our results showed that N addition reduced CHG cytosine-methylation levels markedly compared with control plants growing in homogeneous pots (P = 0.026). No substantial differences were observed in morphological traits at the end of the growing stage, except for the highest ratio of leaf area to leaf dry mass in the medium-N patch (P = 0.008). However, significant linear regression relationships were found between cytosine-methylation levels and morphological traits, such as bud number and rhizome length and biomass. In conclusion, the higher cytosine-methylation level may activate asexual reproduction to produce more offspring and expand plant populations, possibly helping clonal plants to adapt to heterogeneous habitats.

Additional keywords: epigenetic variation, methylation-sensitive amplified polymorphism (MSAP), nutrient heterogeneity, phenotypic plasticity.


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