Document Detail

Intraspecific Arabidopsis hybrids show different patterns of heterosis despite the close relatedness of the parental genomes.
MedLine Citation:
PMID:  25073707     Owner:  NLM     Status:  Publisher    
Heterosis is important for agriculture, however, little is known about the mechanisms driving hybrid vigor. Ultimately, heterosis depends on the interactions of specific alleles and epialleles provided by the parents, which is why hybrids can exhibit different levels of heterosis even within the same species. We characterise the development of several intraspecific Arabidopsis F1 hybrids that show different levels of heterosis at maturity. We identify several phases of heterosis beginning during embryogenesis and culminating in a final phase of vegetative maturity and seed production. During each phase the hybrids show different levels and patterns of growth despite the close relatedness of the parents. For instance, during the vegetative phases the hybrids develop larger leaves than the parents to varied extents, and do so by exploiting increases in cell size and cell numbers in different ratios. Consistent with this we observed changes in the expression of genes known to regulate leaf size in developing rosettes of the hybrids, with the patterns of altered expression differing between combinations. The data demonstrate that heterosis is dependent upon changes in development throughout the growth cycle of the hybrid; with the traits of mature vegetative biomass and reproductive yield a cumulative outcomes of heterosis at different levels, tissues and times of development.
Michael Groszmann; Rebeca Gonzalez-Bayon; Ian K Greaves; Li Wang; Amanda K Huen; William James Peacock; Elizabeth S Dennis
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2014-7-29
Journal Detail:
Title:  Plant physiology     Volume:  -     ISSN:  1532-2548     ISO Abbreviation:  Plant Physiol.     Publication Date:  2014 Jul 
Date Detail:
Created Date:  2014-7-30     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0401224     Medline TA:  Plant Physiol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2014, American Society of Plant Biologists.
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