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TZID:Europe/Vienna
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DTSTART:20260329T030000
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DTSTART:20251026T020000
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BEGIN:VEVENT
DTSTAMP:20260424T040549Z
UID:1762165800@ist.ac.at
DTSTART:20251103T113000
DTEND:20251103T123000
DESCRIPTION:Speaker: Claudia Köhler\nhosted by Xiaoqi Feng\nAbstract: Abst
 ract: Small interfering RNAs (siRNAs) play a crucial role in plant reprodu
 ction\, yet their mobility and function remain incompletely understood. We
  found that a large proportion of siRNAs found in pollen of the flowering 
 plant Capsella rubella relies on non-cell-autonomous mobile siRNAs generat
 ed in surrounding maternal tissues. Using a grafting approach\, we show th
 at siRNAs generated in maternal tissues that surround the fertilization pr
 oducts act as non-cell autonomous mobile signals that trigger the producti
 on of secondary siRNAs through post-transcriptional gene silencing. This p
 rocess parallels reproductive phased si (phasi)RNA biogenesis\, which is w
 idespread across angiosperms but has been considered absent in Brassicacea
 e. These mobile siRNAs do not primarily guide DNA methylation\, but mainly
  function post-transcriptionally and cleave transcripts. Loss of these rep
 roductive siRNAs causes pollen arrest\, underscoring their essential role.
  Together\, these findings highlight siRNAs as long-distance communication
  signals from maternal sporophytic tissues to the male gametophyte with cr
 itical functions in developmental regulation.
LOCATION:Raiffeisen Lecture Hall\, ISTA
ORGANIZER:diana.gruber@ista.ac.at
SUMMARY:Claudia Köhler: Mobile Small RNAs Controlling Plant Reproduction
URL:https://talks-calendar.ista.ac.at/events/5773
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