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SUMMARY:A ABA-induced triacylglycerol accumulation and lipid remodeling in
  Lemna minor toward metabolic engineering of duckweed
DTSTART;VALUE=DATE-TIME:20260929T093000Z
DTEND;VALUE=DATE-TIME:20260929T094500Z
DTSTAMP;VALUE=DATE-TIME:20260915T211939Z
UID:indico-contribution-2898@cern.ch
DESCRIPTION:Speakers: Yasuyo Yamaoka (The Catholic University of Korea)\nD
 uckweeds are among the fastest-growing flowering plants and represent prom
 ising aquatic biomass resources for food\, feed\, bioenergy\, and other va
 lue-added compounds. However\, the endogenous mechanisms controlling carbo
 n allocation and lipid accumulation in duckweeds remain poorly understood.
  Here\, we investigated abscisic acid (ABA)-induced lipid remodeling in *L
 emna minor*. Treatment with 1 μM ABA caused a pronounced and sustained in
 crease in triacylglycerol (TAG)\, reaching approximately 2.9-fold higher l
 evels than in untreated plants. Time-course analysis showed that TAG conti
 nued to accumulate over seven days. Lipidomic profiling revealed extensive
  remodeling of plastidial and extraplastidial membrane lipids. In particul
 ar\, reduced monogalactosyldiacylglycerol suggested that membrane-derived 
 fatty acids may contribute to TAG synthesis. ABA strongly induced diacylgl
 ycerol acyltransferase genes involved in the terminal step of TAG assembly
 \, while repressing fatty acid desaturase genes\, resulting in lower polyu
 nsaturated fatty acid levels and increased proportions of oleic and linole
 ic acids. Confocal microscopy further demonstrated substantial lipid dropl
 et accumulation in both fronds and chloroplast-containing roots. Notably\,
  sustained ABA-induced TAG accumulation was particularly prominent in *L. 
 minor* and was not observed to a comparable extent in other duckweed speci
 es or in Arabidopsis thaliana under identical conditions. These findings r
 eveal a species-specific link between ABA signaling\, membrane lipid turno
 ver\, and carbon storage in duckweed. Building on these findings\, we are 
 establishing a Korean duckweed collection to explore natural variation in 
 lipid metabolic traits. We are also developing transformation-based approa
 ches to modify carotenoid and lipid composition. Together\, these efforts 
 integrate duckweed biodiversity\, stress physiology\, and metabolic engine
 ering toward sustainable biotechnological applications.\n\nhttps://indico.
 unina.it/event/117/contributions/2898/
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/2898/
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