Cherif E, Zehdi-Azouzi S, Crabos A, Castillo K, Chabrillange N, Pintaud J-C, Salhi-Hannachi A, Glémin S, Aberlenc-Bertossi F
IRD/CIRAD F2F-palm group, UMR DIADE, Centre IRD, Montpellier, France.
Laboratoire de Génétique Moléculaire, Immunologie et Biotechnologie, Faculté des sciences de Tunis, Université Tunis El Manar, El Manar, Tunisia.
J Evol Biol. 2016 Aug;29(8):1513-22. doi: 10.1111/jeb.12887. Epub 2016 May 20.
Understanding the driving forces and molecular processes underlying dioecy and sex chromosome evolution, leading from hermaphroditism to the occurrence of male and female individuals, is of considerable interest in fundamental and applied research. The genus Phoenix, belonging to the Arecaceae family, consists uniquely of dioecious species. Phylogenetic data suggest that the genus Phoenix has diverged from a hermaphroditic ancestor which is also shared with its closest relatives. We have investigated the cessation of recombination in the sex-determination region within the genus Phoenix as a whole by extending the analysis of P. dactylifera SSR sex-related loci to eight other species within the genus. Phylogenetic analysis of a date palm sex-linked PdMYB1 gene in these species has revealed that sex-linked alleles have not clustered in a species-dependent way but rather in X and Y-allele clusters. Our data show that sex chromosomes evolved from a common autosomal origin before the diversification of the extant dioecious species.
了解雌雄异株和性染色体进化背后的驱动力及分子过程，即从雌雄同体到雄性和雌性个体的出现，在基础研究和应用研究中都具有相当大的吸引力。凤凰木属属于棕榈科，仅由雌雄异株的物种组成。系统发育数据表明，凤凰木属已从一个雌雄同体的祖先分化而来，该祖先也是其近亲所共有的。我们通过将海枣SSR性别相关位点的分析扩展到该属的其他八个物种，对整个凤凰木属性别决定区域内重组的停止情况进行了研究。对这些物种中海枣性别连锁的PdMYB1基因的系统发育分析表明，性别连锁等位基因并非以物种依赖的方式聚类，而是以X和Y等位基因聚类。我们的数据表明，性染色体在现存雌雄异株物种多样化之前就从共同的常染色体起源进化而来。
