Changes in 24-nt siRNA levels in Arabidopsis hybrids suggest an epigenetic contribution to hybrid vigor

被引：226

作者：

Groszmann, Michael ^{[1
,2
]}

Greaves, Ian K. ^{[1
,3
]}

Albertyn, Zayed I. ^{[4
]}

Scofield, Graham N. ^{[1
]}

Peacock, William J. ^{[1
]}

Dennis, Elizabeth S. ^{[1
,2
]}

机构：

[1] Commonwealth Sci & Ind Res Org Plant Ind, Canberra, ACT 2601, Australia

[2] NSW Agr Genom Ctr, Wagga Wagga, NSW 2650, Australia

[3] Australian Natl Univ, Dept Genome Biol, John Curtin Sch Med Res, Canberra, ACT 0200, Australia

[4] Novocraft Technol, Petaling Jaya 46300, Selangor, Malaysia

来源：

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA | 2011年 / 108卷 / 06期

关键词：

yield increase; epigenome; transposons; transacting siRNA; transmethylation; DIRECTED DNA METHYLATION; QUANTITATIVE TRAIT LOCI; HETEROSIS; PLANTS; YIELD; GENE; DRM; METHYLTRANSFERASES; INHERITANCE; TOMATO;

D O I：

10.1073/pnas.1019217108

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Intraspecific hybrids between the Arabidopsis thaliana accessions C24 and Landsberg erecta have strong heterosis. The reciprocal hybrids show a decreased level of 24-nt small RNA (sRNA) relative to the parents with the decrease greatest for those loci where the parents had markedly different 24-nt sRNA levels. The genomic regions with reduced 24-nt sRNA levels were largely associated with genes and their flanking regions indicating a potential effect on gene expression. We identified several examples of genes with altered 24-nt sRNA levels that showed correlated changes in DNA methylation and expression levels. We suggest that such epigenetically generated differences in gene activity may contribute to hybrid vigor and that the epigenetic diversity between ecotypes provides increased allelic (epi-allelic) variability that could contribute to heterosis.

引用

页码：2617 / 2622

页数：6

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