A century of b chromosomes in plants: so what?

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dc.contributor.author Houben, Andreas
dc.contributor.author Jones, R. Neil
dc.contributor.author Viegas, W.
dc.date.accessioned 2009-05-21T08:50:01Z
dc.date.available 2009-05-21T08:50:01Z
dc.date.issued 2008-04-01
dc.identifier.citation Houben , A , Jones , R N & Viegas , W 2008 , ' A century of b chromosomes in plants: so what? ' Annals of Botany , vol 101 , no. 6 , pp. 767-775 . , 10.1093/aob/mcm167 , 10.1093/aob/mcm167 en
dc.identifier.issn 1095-8290
dc.identifier.other PURE: 101345
dc.identifier.other dspace: 2160/2270
dc.identifier.uri http://hdl.handle.net/2160/2270
dc.identifier.uri http://aob.oxfordjournals.org/cgi/search?fulltext=A+century+of+b+chromosomes+&x=9&y=9 en
dc.description Jones, R. N., Viegas, W., Houben, A. (2008). A century of b chromosomes in plants: so what?  Annals of Botany, 101, (6), pp. 767-775 Key words: B chromosomes, DNA polymorphisms, host/parasite interaction, mitotic/meiotic drive, applications, genome organization/evolution, centromeres IMPF: 02.75 en
dc.description.abstract Background: Supernumerary B chromosomes (Bs) are a major source of intraspecific variation in nuclear DNA amounts in numerous species of plants. They favour large genomes, and create polymorphisms for DNA variation in natural populations. By studying Bs we can gain useful knowledge about the organization, function and evolution of genomes. There are also significant biological questions concerning the origin and structural organization of Bs, and the way in which these selfish elements can establish themselves by exploiting the replicative machinery of their host genome nucleus. Scope: It is a sine qua non that Bs originate from the A chromosomes, in a variety of ways. We can study their modes of drive and ask how it is that chromosomes which apparently lack genes can have control over their own drive process which leads to their survival in natural populations. Molecular cytogenetic studies are opening up new avenues of investigation. Population equilibria for B frequencies are determined by a balance between accumulation and harmful effects. Bs are also subject to meiotic loss due to polysomy and to elimination at meiosis as univalents. These balancing forces can be seen in the context of host/parasite interaction, based on a dissection of the genetic elements in both As and Bs (in maize) which interact to bring about a stable equilibrium, at least for a snapshot in time. Conclusions: Aside from their intrinsic enigmatic properties, B chromosomes make useful experimental tools to study genome organization. Thus far they have not been exploited for their applications, other than through the use of A-B translocations used for gene mapping in maize; but there are opportunities to use them to modulate the frequency and distribution of recombination, to diploidize allopolyploids, to study centromeres and to be developed as plant artificial chromosomes; given that they can be structurally modified and their inheritance stabilized. en
dc.format.extent 9 en
dc.language.iso eng
dc.relation.ispartof Annals of Botany en
dc.title A century of b chromosomes in plants: so what? en
dc.type Text en
dc.type.publicationtype Article (Journal) en
dc.identifier.doi http://dx.doi.org/10.1093/aob/mcm167
dc.contributor.institution Institute of Biological, Environmental and Rural Sciences en
dc.description.status Peer reviewed en


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