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SUMMARY:Clone-dependent germination and post-dormancy growth of ABA-induce
 d turions in Spirodela polyrhiza
DTSTART;VALUE=DATE-TIME:20260929T160000Z
DTEND;VALUE=DATE-TIME:20260929T161500Z
DTSTAMP;VALUE=DATE-TIME:20260917T004448Z
UID:indico-contribution-2966@cern.ch
DESCRIPTION:Speakers: Raja Amri ()\nTurions\, the vegetative dormant organ
 s\, are vital for some duckweed species\, enabling their survival under ha
 rsh conditions. We studied the turion germination and then sprouting of fo
 ur Spirodela polyrhiza clones. Turions were collected from 7-day old growt
 h cultures treated by 0.5 µM abscisic acid (ABA) in Steinberg medium. Ger
 mination tests were performed under continuous light for 7 days\, immediat
 ely after harvesting the turions or after cold storage in darkness. The gr
 owth and photosynthetic activity of turion-derived fronds was compared wit
 h those developed in non-ABA treatment\, culture-derived fronds. Germinati
 on capacity of turions was clone-specific. Immediately after harvesting\, 
 turions of UD0402 and UD0408 germinated readily at 81.2% and 73.3%\, where
 as those of UD0401 and UD0407 germinated poorly at 8.7% and 0.0%\, respect
 ively. The cold storage influenced differently the turion germination:  in
 creased largely in UD0401\, moderately in UD0407 while decreased in UD0402
  and UD0408.Turion-derived fronds of UD0401\, UD0402\, and UD0407 showed g
 reater frond area\, and lower LMA and LDMC than the culture-derived fronds
 \, suggesting reserve-supported area expansion in the former ones\, rather
  than increasing dry-matter accumulation. However\, there were no differen
 ces in these traits between the two frond types of UD0408. Independently o
 f turion storage duration\, the turion-derived fronds showed mostly compar
 able physiological traits to culture-derived fronds. Consistently\, the ch
 lorophyll fluorescence results showed that\, turion-derived fronds reached
  similar levels of photosynthetic activity. Overall\, the results show tha
 t exogenous 0.5 µM ABA was able to trigger turions formation of all studi
 ed clones\, but the germination success depended on the clone and the stor
 age duration.\n\nhttps://indico.unina.it/event/117/contributions/2966/
LOCATION: Sala Monumentini
URL:https://indico.unina.it/event/117/contributions/2966/
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