[Plantsci] SPLS Tuesday Seminar – November 19 – Heng Chen, University of Arizona

[Xiong, Zhongguo - (zxiong)]

Dear all,

Please join us in Marley 230 on Tuesday, Nov. 19 at 4:00 PM for a seminar presented by Heng Chen from the School of Plant Sciences, University of Arizona.

Zoom link<https://arizona.zoom.us/j/83044711714?pwd=IQ994mWIPwbsRKMnfF9sERx5sNtv4m.1>: https://arizona.zoom.us/j/83044711714 (password: SPLS24).
Refreshments will be provided in the Marley Lobby at 3:30 PM.

Title: How mating system impacts siren siRNA biology

Abstract: The transition from outcrossing to self-fertilization (selfing) is often accompanied by a distinct set of floral morphological changes, which are known as the selfing syndrome. The transition to selfing also profoundly affects the genome, including homozygosity and genomic conflicts. As selfing lineages become more homozygous, selfish genetic elements, such as transposons, lose their ability to spread across different genetic backgrounds. Similarly, kin conflicts, common in outbreeders, diminish when parents and offspring are genetically identical. Recent evidence suggests that many genomic conflicts are regulated epigenetically, leading to the hypothesis of an "epigenomic selfing syndrome."

This research employs three closely related species with different mating systems, Capsella grandiflora (Cg, an outbreeder), Capsella rubella (Cr, an inbreeder) and Capsella orientalis (Co, an inbreeder), as models. It combines genetic and epigenetic approaches to investigate the hypothesis that there are consistent and predictable changes in epigenomes following the transition to selfing, and that these changes are associated with RNA-directed DNA Methylation (RdDM). In this seminar, I will discuss the difference among three Capsella genomes and initial comparisons of RdDM regulation of their transcriptomes.

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Zhongguo Xiong
School of Plant Sciences       BIO5 Institute
BIO5                           Email: zxiong at arizona.edu<mailto:zxiong at arizona.edu>
                               Phone: (520)-621-9869
Forbes 303, P.O. box 210036    Fax: (520)-621-7186
University of Arizona
Tucson, AZ 85721-0036          http://ag.arizona.edu/~zxiong
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