Steps in the evolution of heteromorphic sex chromosomes

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Comprehending crystalline β-carotene accumulation by comparing engineered cell models and the natural carotenoid-rich system of citrus (2011, neutral): “The transition to dioecy has been associated with the evolution of sex chromosomes in some dioecious plant species (Charlesworth et al., 2005), and theory suggests that they can facilitate the evolution of sexual dimorphism (Rice, 1984).”
Genetic linkage maps of Populus alba L. and comparative mapping analysis of sex determination across Populus species (2010, background): “repetitive sequences, and finally, the appearance of structurally differentiated sex chromosomes (Bergero and Charlesworth 2009; Charlesworth et al. 2005; Ming et al. 2007; Ming and Moore 2007).”
Revisiting the Impact of Inversions in Evolution: From Population Genetic Markers to Drivers of Adaptive Shifts and Speciation? (2008, background): “Recombination suppression in sex chromosomes may increase through the spread of alleles that modify local recombination rates or through chromosomal rearrangements such as inversions (Charlesworth et al. 2005, Fraser & Heitman 2005).”
Genetic linkage mapping in aspen (Populus tremula L. and Populus tremuloides Michx.) (2009, background): “Impeding progress in this case could be the fact that the region surrounding the sex trait is possibly a region of high recombination suppression, a characteristic feature of sex chromosomes (Charlesworth et al. 2005, Yin et al. 2008).”