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SUMMARY:Intra-specific variation in growth and photosynthetic responses of
  duckweed Lemna gibba to manganese
DTSTART;VALUE=DATE-TIME:20260929T155500Z
DTEND;VALUE=DATE-TIME:20260929T161500Z
DTSTAMP;VALUE=DATE-TIME:20260916T130421Z
UID:indico-contribution-2948@cern.ch
DESCRIPTION:Speakers: Amare Fassil Abebaw (Doctoral School of Natural Scie
 nces\, Szent István Campus\, Hungarian University of Agriculture and Life
  Sciences)\nAbstract\nThis study investigated the growth and physiological
  responses of four Lemna gibba clones (UD0101\, UD0103\, UD0106\, and UD01
 14) following 7-day exposure to Mn (0.05–160 mg L⁻¹) under controlled
  conditions (Steinberg’s medium containing 0.05 mg Mn L⁻¹). Growth wa
 s assessed using frond area relative growth rate (RGRFA) and frond number 
 relative growth rate (RGRFN). Photosynthetic performance was evaluated usi
 ng Fv/Fm\, Y(II)\, Y(NPQ)\, and Y(NO). All clones were affected at Mn conc
 entrations ≥20 mg L⁻¹\, whereas UD0103 showed growth inhibition from 
 5 mg L⁻¹. Under control conditions\, RGRFA ranged from 0.287 day⁻¹ (
 UD0106) to 0.334 day⁻¹ (UD0101)\, while RGRFN ranged from 0.269 day⁻
 ¹ (UD0106) to 0.294 day⁻¹ (UD0101)\; UD0103 and UD0114 showed intermed
 iate growth rates. At 160 mg Mn L⁻¹\, RGRFA relative to the control ind
 icated Mn tolerance in the order UD0101 (50%) > UD0114 (40%) > UD0103 (27%
 ) > UD0106 (25%). Despite growth inhibition\, Fv/Fm remained at or slightl
 y above control levels (99–108%) in UD0101 and UD0106\, whereas UD0103 a
 nd UD0114 showed reduced Fv/Fm at ≥20 mg Mn L⁻¹\, reaching minima of 
 94.9% and 95.2% of the control\, respectively. Similarly\, increasing Mn c
 oncentrations reduced Y(II) in all clones. At 40 mg L⁻¹\, Y(NPQ) increa
 sed significantly\, peaking at approximately 1.8-fold and 1.7-fold above t
 he control in UD0106 and UD0114\, respectively. In contrast\, UD0101 maint
 ained stable Y(II)\, Y(NPQ)\, and Y(NO)\, whereas UD0103 showed the greate
 st increase in Y(NO) and a reduced Y(II). These findings suggest that UD01
 03 could serve as a bioindicator of Mn pollution\, whereas UD0101 shows po
 tential for phytoremediation.\n\nhttps://indico.unina.it/event/117/contrib
 utions/2948/
LOCATION: Sala Monumentini
URL:https://indico.unina.it/event/117/contributions/2948/
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