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SUMMARY:The Impact of Polyploidy and Hybridization on Gene Expression in D
 uckweeds
DTSTART;VALUE=DATE-TIME:20260929T131500Z
DTEND;VALUE=DATE-TIME:20260929T133000Z
DTSTAMP;VALUE=DATE-TIME:20260920T044505Z
UID:indico-contribution-2906@cern.ch
DESCRIPTION:Speakers: Ewout Crombez ()\nRecent discoveries of extensive pl
 oidy variation and natural hybridization have revealed an unexpected level
  of genomic diversity within duckweeds\, particularly in the genus *Lemna*
 . Naturally occurring cytotypes include auto-triploids\, auto-tetraploids\
 , and diploid\, triploid\, tetraploid and aneuploid interspecific hybrids.
  This remarkable diversity provides a unique opportunity to investigate ho
 w genome duplication and hybridization shape transcriptional regulation. W
 e first focus on the highly variable *Lemna aequinoctialis x perpusilla* h
 ybrid species complex to examine how differences in ploidy level and subge
 nome composition influence the transcriptome. A selection of natural hybri
 d clones spanning multiple ploidy levels was exposed to salt stress for th
 ree weeks and subsequently profiled by RNA-sequencing\, enabling us to ass
 ess how ploidy affects transcriptional responses to environmental stress. 
 In particular\, we examine patterns of expression level dominance\, homoeo
 log expression bias\, dosage and odd-even ploidy effects and regulatory di
 vergence across hybrids. Complementing the hybrid study\, we compare gene 
 expression in diploid and colchicine-induced autotetraploid lineages of *S
 pirodela polyrhiza* under a long-term mild salt stress regime\, tracking t
 ranscriptional changes over many clonal generations. By comparing transcri
 ptional responses at the onset and after prolonged mild salt exposure\, we
  investigate how genome duplication influences the dynamics\, stability\, 
 and plasticity of gene expression. Together\, these studies demonstrate th
 e potential of duckweeds as powerful model systems for investigating the m
 olecular consequences of genome duplication and hybridization\, and their 
 roles in shaping plant responses to environmental stress.\n\nhttps://indic
 o.unina.it/event/117/contributions/2906/
LOCATION:Department of Agricultural Sciences of the University of Napoli F
 ederico II\, Portici\, Italy Sala Cinese
URL:https://indico.unina.it/event/117/contributions/2906/
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