Pregled bibliografske jedinice broj: 777841
Impaired electron transport in thylakoid membranes of young spruce needles exposed to high light stress
Impaired electron transport in thylakoid membranes of young spruce needles exposed to high light stress // Book of Abstract / 2nd International Conference on Plant Biology ; 21st Symposium of the Serbian Plant Physiology Society ; COST ACTION FA1106 QUALITYFRUIT Workshop / Uzelac, Branka (ur.).
Beograd: Serbian Plant Physiology Society ; Institute for Biological Research Siniša Stanković ; Biološki fakultet Univerziteta u Beogradu, 2015. str. 155-155 (poster, međunarodna recenzija, sažetak, znanstveni)
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Naslov
Impaired electron transport in thylakoid membranes of young spruce needles exposed to high light stress
Autori
Antunović Dunić, Jasenka ; Cvetković, Magdalena ; Cesar, Vera ; Lepeduš, Hrvoje
Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni
Izvornik
Book of Abstract / 2nd International Conference on Plant Biology ; 21st Symposium of the Serbian Plant Physiology Society ; COST ACTION FA1106 QUALITYFRUIT Workshop
/ Uzelac, Branka - Beograd : Serbian Plant Physiology Society ; Institute for Biological Research Siniša Stanković ; Biološki fakultet Univerziteta u Beogradu, 2015, 155-155
ISBN
978-86-912591-3-6
Skup
2nd International Conference on Plant Biology and 21st Symposium of the Serbian Plant Physiology Society
Mjesto i datum
Petnica, Srbija, 17.06.2015. - 20.06.2015
Vrsta sudjelovanja
Poster
Vrsta recenzije
Međunarodna recenzija
Ključne riječi
Picea abies; high light stress; photoinhibition; chlorophyll a fluorescence; photosynthesis
Sažetak
Photoinhibitory implications in photosynthetic apparatus of two developmental stages of Norway spruce (Picea abies L. Karst.) needles, current-year (CY, three months old) and previous-year (PY, one year older), were investigated. Chlorophyll a fluorescence of young (CY) and mature (PY) needles, collected early in the morning, was measured after acclimatization to the room temperature and after the stress treatment (HL, ~850 μmolm-2s-1 ; 291 0C ; 1 hour) conducted in growth chamber. The maximum quantum yield of photosystem II (PSII), Fv/Fm, measured before stress application showed fully functional PSII in both CY and PY needles. Increased performance index on absorption basis (PIABS) in PY revealed their higher overall photosynthetic efficiency. Light stress (HL) slightly decreased Fv/Fm in both, CY and PY needles, but remained high above limited value for PSII functionality (Fv/Fm>0.75). Specific fluxes per active reaction center (RC) including absorption (ABS/RC) and trapping of excitation energy (TR0/RC), electron transport (ET0/RC) and dissipation of excessive absorbed energy (DI0/RC) were also analyzed. CY needles had decreased PIABS and ET0/RC after stress treatment. Other fluxes per RC showed significantly higher values in CY, if compared with PY needles. In conclusion, we can highlight better acclimation response of mature needles under photoinhibitory light. In spite of the same primary photochemistry, young needles were strongly affected by light stress what was related to inhibited electron transport in thylakoid membranes.
Izvorni jezik
Engleski
Znanstvena područja
Biologija
POVEZANOST RADA
Projekti:
073-0731674-1673 - Utjecaj oksidativnog stresa na organizaciju i funkciju biljnih stanica i tkiva (Lepeduš, Hrvoje, MZOS ) ( CroRIS)
Ustanove:
Filozofski fakultet, Osijek,
Sveučilište u Osijeku - Odjel za biologiju
