IBIS-Flora

Angiosperm Flora of India

Parental genome imbalance in Brassica oleracea causes asymmetric triploid block

Publication Type:Journal Article
Year of Publication:2012
Authors:Stoute, AI, Varenko, V, King, GJ, Scott, RJ, Kurup, S
Journal:The Plant Journal
Volume:71
Issue:3
Date Published:2012
ISBN Number:1365-313X
Keywords:Brassica, endosperm, interploidy crosses, MADS box, seed development
Abstract:

Interploidy crosses fail in many plant species due to abnormalities in endosperm development. In the inbreeding species Arabidopsis thaliana, both paternal and maternal excess interploidy crosses usually result in viable seed that exhibit parent-of-origin effects on endosperm development and final seed size. Paternal excess crosses result in extended proliferation of the endosperm and larger seeds, while conversely maternal excess crosses result in early endosperm cellularisation and smaller seeds. Investigations into the effect of parental gene dosage on seed development have revealed that MADS box transcription factors, particularly the AGAMOUS-like family, play important roles in controlling endosperm proliferation. The important crop genus Brassica contains self-incompatible outbreeding species and has a larger and more complex genome than the closely related Arabidopsis. Here we show that although Brassica oleracea displays strong parent-of-origin effects on seed development, triploid block due to lethal disruption of endosperm development was restricted to paternal excess, with maternal excess crosses yielding viable seed. In addition, transcriptome analyses of Brassica homologues of Arabidopsis genes linked to parent-of-origin effects revealed conservation of some mechanisms controlling aspects endosperm behaviour in the two species. However, there were also differences that may explain the failure of the paternal excess cross in B. oleracea.

URL:http://dx.doi.org/10.1111/j.1365-313X.2012.05015.x
Short Title:The Plant Journal
Taxonomic name: 
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Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith