Reardon, Wesley and Gallagher, Pauline and Nolan, Katie M. and Wright, Hayley and Carde-nosa-Rubio, Maria Cruz and Bragalini, Claudia and Lee, Chui-Sang and Fitzpatrick, David A. and Corcoran, Killian and Wolff, Kirsten and Nugent, Jacqueline M.
(2014)
Different outcomes for the MYB floral symmetry genes DIVARICATA and RADIALIS during the evolution of derived actinomorphy in Plantago.
New Phytologist, 202 (2).
pp. 716-725.
ISSN 0028-646X
Abstract
*The gene network that specifies flower shape in Antirrhinum majus (bilateral floral symmetry
or zygomorphy) includes two MYB-class genes – RADIALIS (RAD) and DIVARICATA
(DIV). RAD is involved in establishing the dorsal identity program and its role is to regulate the
domain of activity of DIV (the ventral identity program) by restricting it to ventral regions of
the flower.
*Plantago is in the same family as Antirrhinum but has small, radially symmetrical
(actinomorphic) flowers derived from a zygomorphic ancestral state. Here we investigate the
MYB-class floral symmetry genes and the role they have played in the evolution of derived
actinomorphy in Plantago lanceolata.
*A DIV ortholog (PlDIV) but no RAD ortholog was identified in P. lanceolata. PlDIV is
expressed across all petals and stamens later in flower development, which is consistent with
the loss of RAD gene function. PlDIV expression in anther sporogenous tissue also suggests
that PlDIV was co-opted to regulate cell proliferation during the early stages of pollen development.
*These results indicate that evolution of derived actinomorphy in Plantago involved complete
loss of dorsal gene function, resulting in expansion of the domain of expression of the
ventral class of floral symmetry genes.
| Item Type: |
Article
|
| Keywords: |
DIVARICATA; floral symmetry; Plantago; pollen development; RADIALIS; |
| Academic Unit: |
Faculty of Science and Engineering > Biology |
| Item ID: |
7460 |
| Identification Number: |
https://doi.org/10.1111/nph.12682 |
| Depositing User: |
David Fitzpatrick
|
| Date Deposited: |
22 Sep 2016 15:24 |
| Journal or Publication Title: |
New Phytologist |
| Publisher: |
Wiley |
| Refereed: |
Yes |
| Funders: |
Enterprise Ireland (EI), Science Foundation Ireland (SFI) |
| URI: |
|
| Use Licence: |
This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available
here |
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