Homomorphic plant sex chromosomes are coming of age
نویسندگان
چکیده
منابع مشابه
Plant Evolution: Modern Sex Chromosomes
The first detailed map has been produced of a plant chromosome carrying sex-determining genes. The new data show that, in papaya, these genes lie in a quite extensive non-recombining region. This region is nevertheless a small part of the papaya genome compared with other male-specific genome regions, such as mammalian Y chromosomes.
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Animal Y chromosomes have undergone chromosome-wide degeneration in response to a lack of recombination, and ancient Ys contain few functional genes. Recent research suggests that plant Y chromosomes may evolve differently and retain most of their ancestral genes.
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Three principal types of chromosomal sex determination are found in nature: male heterogamety (XY systems, as in mammals), female heterogamety (ZW systems, as in birds), and haploid phase determination (UV systems, as in some algae and bryophytes). Although these systems share many common features, there are important biological differences between them that have broad evolutionary and genomic ...
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Genetic crosses between the dioecious Bryonia dioica (Cucurbitaceae) and the monoecious B. alba in 1903 provided the first clear evidence for Mendelian inheritance of dioecy and made B. dioica the first organism for which XY sex-determination was experimentally proven. Applying molecular tools to this system, we developed a sex-linked sequence-characterized amplified region (SCAR) marker for B....
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The dioecious genus Spinacia is thought to include two wild relatives (S. turkestanica Ilj. and S. tetrandra Stev.) of cultivated spinach (S. oleracea L.). In this study, nuclear and chloroplast sequences from 21 accessions of Spinacia germplasm and six spinach cultivars or lines were subjected to phylogenetic analysis to define the relationships among the three species. Maximum-likelihood sequ...
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ژورنال
عنوان ژورنال: Molecular Ecology
سال: 2015
ISSN: 0962-1083
DOI: 10.1111/mec.13268