HOMEPRODUCTSCOMPANYCONTACTFAQResearchDictionaryPharmaSign Up FREE or Login

Chromosomal and genome-wide molecular changes associated with initial stages of allohexaploidization in wheat can be transit and incidental.

Abstract
Genomic instability can be induced by nascent allopolyploidization in plants. However, most previous studies have not defined to what extent the allopolyploidy-induced rapid genomic instability represents a general response, and hence important to evolution, or merely incidental events occurring stochastically in a limited number of individuals. We report here that in a newly formed allohexaploid wheat line between tetraploid wheat Triticum turgidum subsp. durum (genome BBAA) and Aegilops tauschii (genome DD) a great majority of individual plants showed chromosomal stability and exhibited a genomic constitution similar to that of the present-day Triticum aestivum (genome BBAADD). In contrast, a single individual plant was identified at S(2), which exhibited chromosomal instability in both number and structure based on multicolor genomic in situ hybridization (mc-GISH) analysis. Accordingly, this plant also manifested extensive changes at the molecular level including loss and gain of DNA segments and DNA methylation repatterning. Remarkably, the chromosomal and molecular instabilities that presumably occurred at S(0) to S(1) and (or) in the F(1) hybrid were rapidly quenched by S(2) and followed by stable transgenerational inheritance. Our results suggest that these stochastic and individual-specific rapid genomic changes, albeit interesting, probably have not played a major role in the speciation and evolution of common wheat, T. aestivum.
AuthorsNa Zhao, Liying Xu, Bo Zhu, Mingjiu Li, Huakun Zhang, Bao Qi, Chunming Xu, Fangpu Han, Bao Liu
JournalGenome (Genome) Vol. 54 Issue 8 Pg. 692-9 (Aug 2011) ISSN: 1480-3321 [Electronic] Canada
PMID21797821 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
Topics
  • Amplified Fragment Length Polymorphism Analysis
  • Chimera (genetics)
  • Chromosomes, Plant (chemistry, genetics)
  • Crosses, Genetic
  • DNA Methylation (genetics)
  • Genetic Speciation
  • Genome, Plant
  • Genomic Instability
  • Genomics
  • In Situ Hybridization
  • Microscopy, Fluorescence
  • Mutagenesis, Insertional
  • Polyploidy
  • Sequence Deletion
  • Triticum (genetics)

Join CureHunter, for free Research Interface BASIC access!

Take advantage of free CureHunter research engine access to explore the best drug and treatment options for any disease. Find out why thousands of doctors, pharma researchers and patient activists around the world use CureHunter every day.
Realize the full power of the drug-disease research graph!


Choose Username:
Email:
Password:
Verify Password:
Enter Code Shown: