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SUMMARY:*Lemna trisulca*: Contribution to the Progress in Understanding th
 e Mechanism of Chloroplast Movements
DTSTART;VALUE=DATE-TIME:20260929T073000Z
DTEND;VALUE=DATE-TIME:20260929T074500Z
DTSTAMP;VALUE=DATE-TIME:20260917T065924Z
UID:indico-contribution-2893@cern.ch
DESCRIPTION:Speakers: Halina Gabrys (Jagiellonian University\, Faculty of 
 Biochemistry\, Biophysics and Biotechnology)\nChloroplasts relocate within
  cells to maximize energy capture under limiting light and/or to minimize 
 exposure to excess light. In higher plants these movements are mediated by
  phototropins\, blue light photoreceptors that control also other light ac
 climation processes.\n     Chloroplast movements share many similarities b
 etween the aquatic angiosperm *L. trisulca* and *Arabidopsis thaliana*. Th
 ese include fluence rate-response curves in continuous light and fluence-r
 esponse profiles obtained with strong light pulses. In both species phosph
 oinositides and Ca^2+^ participate in signalling\, with a greater role of 
 calcium released from the internal stores. \nThe signalling pathway leadin
 g to light-induced chloroplast movement may involve GLutamate Receptor-lik
 e (GLR) channels\, previously shown to participate in light signalling in 
 plants. These ligand-gated ion channels\, structurally homologous to anima
 l neurotransmitter receptors\, are known to generate Ca^2+^ transients ins
 ide plant cells. \nWe chose *L. trisulca* to determine the role of GLR cha
 nnels in chloroplast movements using specific inhibitors. NMDA GLR channel
 s were shown to participate in the control of chloroplast avoidance respon
 se in the duckweed. This control occurs in a pH-dependent way\, similar to
  NMDA receptors operating in animal cells. As the avoidance response is ac
 tivated only by strong blue light\, these GLR channels are involved in the
  phototropin2 signalling pathway. GLR AMPA channels\, previously shown to 
 take part in seedling growth\, proved inactive in chloroplast movements. T
 hus\, we provided evidence that GLR receptors activated by different agoni
 sts have specialised functions in plants. \nGenetic modification of *L. tr
 isulca* is desired to get further insight into the mechanism of its blue-l
 ight-induced chloroplast movements.\n\nhttps://indico.unina.it/event/117/c
 ontributions/2893/
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/2893/
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