Document Detail


Male-specific DNA markers provide genetic evidence of an XY chromosome system, a recombination arrest and allow the tracing of paternal lineages in date palm.
MedLine Citation:
PMID:  23231423     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
Whether sex chromosomes are differentiated is an important aspect of our knowledge of dioecious plants, such as date palm (Phoenix dactylifera). In this crop plant, the female individuals produce dates, and are thus the more valuable sex. However, there is no way to identify the sex of date palm plants before reproductive age, and the sex-determining mechanism is still unclear. To identify sex-linked microsatellite markers, we surveyed a set of 52 male and 55 female genotypes representing the geographical diversity of the species. We found three genetically linked loci that are heterozygous only in males. Male-specific alleles allowed us to identify the gender in 100% of individuals. These results confirm the existence of an XY chromosomal system with a nonrecombining XY-like region in the date palm genome. The distribution of Y haplotypes in western and eastern haplogroups allowed us to trace two male ancestral paternal lineages that account for all known Y diversity in date palm. The very low diversity associated with Y haplotypes is consistent with clonal paternal transmission of a nonrecombining male-determining region. Our results establish the date palm as a biological model with one of the most ancient sex chromosomes in flowering plants.
Authors:
Emira Cherif; Salwa Zehdi; Karina Castillo; Nathalie Chabrillange; Sabira Abdoulkader; Jean-Christophe Pintaud; Sylvain Santoni; Amel Salhi-Hannachi; Sylvain Glémin; Frédérique Aberlenc-Bertossi
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Publication Detail:
Type:  Journal Article     Date:  2012-12-11
Journal Detail:
Title:  The New phytologist     Volume:  197     ISSN:  1469-8137     ISO Abbreviation:  New Phytol.     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2012-12-20     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9882884     Medline TA:  New Phytol     Country:  England    
Other Details:
Languages:  eng     Pagination:  409-15     Citation Subset:  IM    
Copyright Information:
© 2012 IRD. New Phytologist © 2013 New Phytologist Trust.
Affiliation:
IRD/CIRAD Palm Developmental Biology Group, UMR DIADE, Centre IRD, 911 avenue Agropolis, 34394, Montpellier, France; Laboratoire de Génétique Moléculaire, Immunologie et Biotechnologie, Faculté des sciences de Tunis, Université Tunis El Manar, Campus Universitaire, 2092, El Manar, Tunisia.
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