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SUMMARY:Physiological and Transcriptomic Responses of Spirodela polyrhiza 
 to Distinct Colonization Strategies by Plant Growth-Promoting Bacteria
DTSTART;VALUE=DATE-TIME:20261002T080500Z
DTEND;VALUE=DATE-TIME:20261002T082500Z
DTSTAMP;VALUE=DATE-TIME:20260915T141927Z
UID:indico-contribution-2958@cern.ch
DESCRIPTION:Speakers: Karnjana Ruenpham (Interdisciplinary Graduate School
  of Medicine and Engineering\, University of Yamanashi)\nDuckweeds (Lemnac
 eae) are rapidly growing aquatic plants with potential as sustainable feed
 stocks for human nutrition\, animal feed\, biofuel production\, and wastew
 ater bioremediation. In natural environments\, duckweed coexists with dive
 rse microbial communities\, forming a complex host-microbiome assemblage k
 nown as a holobiont. Within this assemblage\, duckweed-associated plant gr
 owth-promoting bacteria (PGPB) play a critical role in enhancing duckweed 
 growth through direct and indirect mechanisms. However\, the specific mech
 anisms driving strain-specific growth promotion remain largely uncharacter
 ized. Therefore\, this study aimed to elucidate these mechanisms by compar
 ing the effects of two PGPB with distinct colonization strategies—*Terri
 microbium* sp. PS02 and *Aeromicrobium* sp. PS05—on the growth\, biochem
 ical composition\, and transcriptomic profile of the giant duckweed\, *Spi
 rodela polyrhiza*. Under SEM observation\, strain PS02 attached to the duc
 kweed surface through the aggregation of 1–3 cells\, while strain PS05 f
 ormed filamentous extracellular polymeric substance (EPS)-mediated microco
 lonies. These distinct colonization strategies aligned with bacterial cell
  density\, where PS05 established approximately one order of magnitude hig
 her bacterial populations than PS02. Both PGPB strains enhanced duckweed b
 iomass\, yielding 1.2- and 1.4-fold increases\, respectively. Markedly\, b
 oth strains enhanced starch accumulation and turion formation without redu
 cing protein or photosynthetic pigment content. Transcriptomic profiles de
 monstrated that PS05 regulated carbohydrate biosynthesis and carbon alloca
 tion. This study provides integrated evidence linking bacterial colonizati
 on strategy\, biomass production\, and host transcriptomic regulation\, al
 lowing us to better understand the mechanisms required for engineering hig
 h-performance duckweed–microbiome systems for sustainable biomass produc
 tion.\n\nhttps://indico.unina.it/event/117/contributions/2958/
LOCATION: Sala Monumentini
URL:https://indico.unina.it/event/117/contributions/2958/
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