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 CA 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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