Sign up & Download
Sign in

Big roles for small RNAs in polyploidy, hybrid vigor, and hybrid incompatibility

by Danny W K Ng, Jie Lu, Z. Jeffrey Chen
Current Opinion in Plant Biology ()

Abstract

Small RNAs, including microRNAs (miRNAs), small interfering RNAs (siRNAs), and . trans-acting siRNAs (ta-siRNAs), mediate gene expression and epigenetic regulation. While siRNAs are highly diverged, miRNAs and ta-siRNAs are generally conserved but many are differentially expressed between related species and in interspecific hybrids and allopolyploids. On one hand, combination of diverged maternal and paternal siRNAs in the same nucleus may exert . cis-acting and . trans-acting effects on transposable elements (TEs) and TE-associated genes, leading to genomic instability and endosperm and embryo failures, constituting a bottleneck for the evolution of hybrids and polyploids. On the other hand, . cis and . trans-acting small RNAs induce quantitative and qualitative changes in epigenetic regulation, leading to morphological variation and hybrid vigor in F1 hybrids and stable allopolyploids as well as transgressive phenotypes in the progeny, increasing a potential for adaptive evolution. © 2012.

Cite this document (BETA)

Page 1
hidden
Page 2
hidden

Readership Statistics

81 Readers on Mendeley
by Discipline
 
by Academic Status
 
28% Ph.D. Student
 
19% Post Doc
 
12% Student (Bachelor)
by Country
 
5% United States
 
5% Brazil
 
2% Portugal

Sign up today - FREE

Mendeley saves you time finding and organizing research. Learn more

  • All your research in one place
  • Add and import papers easily
  • Access it anywhere, anytime

Start using Mendeley in seconds!

Already have an account? Sign in