Dating origins polyploidy events
We review that paradigm shift and emphasize those areas in which the ideas of Stebbins continue to propel the field forward, as well as those areas in which the field was held back; we also note new directions that plant geneticists and evolutionists are now exploring in polyploidy research.Perhaps the most important conclusion from recent and ongoing studies of polyploidy is that, following Levin and others, polyploidy may propel a population into a new adaptive sphere given the myriad changes that accompany genome doubling.Identifying and characterizing plant paleopolyploidies is ongoing research.They are identified through whole genome comparisons using a combination of the data derived from genomic structure (e.g. As such, detecting these events and determining which lineages share what subset are continually changing.My research lies in the area of plant molecular systematics, molecular evolution, and comparative genomics.
Soybean and, particularly, its wild relatives have been the focus of much work, developing the latter into a model system for studying natural allopolyploidy.
In the present study, we sequenced four biparentally inherited nuclear loci and three maternally inherited chloroplast fragments from all diploid and tetraploid species with the B- and C-genome types in this genus. officinalis (C-genome) were the parental progenitors of O. punctata might be better treated as a separate species (O. Recent studies have demonstrated that allopolyploidization (interspecific hybridization and genome doubling) is one of the major modes of diversification and speciation in plants, and the important source of morphological innovations. malampuzhaensis has a localized distribution in South India near the town of Malampuzha. ex Watt is the most common species and is widely distributed in south China, South and Southeast Asia, and Papua New Guinea; whereas O. Peter, is disjunctively distributed in Sri Lanka and West and East Africa (Fig. The overlapping geographical distribution and similarities in gross morphology between the diploid and tetraploid species lead further to the complexity of taxonomy and phylogeny of this group of species.
We detected at least three independent origins of three BC-genome tetraploid species. Thus, studying the origin of allopolyploids is not only the key to the understanding of consequences and mechanisms of polyploidization and crop domestication, but will facilitate also the genetic improvements for important crops and utilization of genetic resources in wild relatives of crop plants. For the diploid species, only a B-genome species (O. rhizomatis Vaughan has only been reported from Sri Lanka. However, they were unable to obtain a fully resolved phylogeny due to limited genetic markers, and failed to identify the parental donors for the tetraploid species using only nuclear markers.
Illustrating the broad impact of polyploidy, ancient WGD events have been documented in vertebrates (e.g., Cañestro, 2012; Braasch and Postlethwait, 2012), fungi (Kellis et al., 2004), and ciliates (Aury et al., 2006); both recent and ancient events occur extensively in plants, particularly in lineages such as the angiosperms.
In fact, researchers have long recognized that polyploidy is an inseparable part of angiosperm biology.