- This event has passed.
Plant Science Seminar: Dr Bronwyn Barkla
Aug 22, 4:00 pm - 5:00 pm
Dr. Bronwyn Barkla, Associate Professor at Southern Cross University will present a seminar on “Making epidermal bladder cells bigger – the role of endopolyploidy in plant salt tolerance”
Tuesday 22nd August.
4:00pm – 5:00pm, Plant Genomics Centre Seminar Room
Trichomes are highly differentiated cell types found on the aerial epidermis of plants. Most commonly they manifest themselves as hairs on leaves, stems and flower buds, and serve a range of functions from protection against insects to heat resistance and moisture conservation. The salt tolerant plant Mesembryanthemum crystallinum (common name Ice plant) has specialized balloon-like trichomes called epidermal bladder cells (EBC) that are thought to play a role in sodium storage and salt tolerance, however, EBC are present on plants even in the absence of salt. In order to gain an integral understanding of the development and role of these cells we have taken a systems biology approach, combining data from global quantitative transcriptomics, proteomics, metabolomics, and ionomics studies with flow cytometry and fluorescence microscopy. Our results demonstrate that these cells are highly metabolically active and not just passive stores for sodium. Recent works shows that the rapid expansion of the cells during development is due to a huge increase in ploidy, beginning in emerging leaves, to higher than 1028C in adult plants, with nuclei of greater than 100 microns in diameter measured in these cells. Salt-treatment leads to additional rounds of endoreduplication and transcripts and proteins involved in endopolyploidy are shown to be upregulated by salt in the EBC, suggesting environmental as well as developmental cues. It has been proposed that increased ploidy helps to mitigate stress damage, and the increase in cell size and ploidy observed in M. crystallinum under salinity may contribute to tolerance by increasing the store size for sodium sequestration.
If you would like to meet with Dr. Barkla while she is here, please contact Stav Manafis (email@example.com).