Kratko priopćenje

https://doi.org/10.1515/botcro-2016-0043

Temperature-dependent chlorophyll accumulation and photosystem II assembly during etioplast to chloroplast transition in sunflower cotyledons

Hrvoje Lepeduš orcid.org/0000-0001-9329-7007 ; Faculty of Humanities and Social Sciences, Josip Juraj Strossmayer University of Osijek, Lorenza Jägera 9, 31000 Osijek, Croatia
Mario Jakopec ; Vodovod Osijek, Poljski put 1, 31000 Osijek, Croatia
Jasenka Antunović Dunić ; Department of Biology, Josip Juraj Strossmayer University of Osijek, Ulica cara Hadrijana 8/A, 31000 Osijek, Croatia
Goran Krizmanić ; Agricultural Institute Osijek, Južno predgrađe 17, 31000, Osijek, Croatia
Sanida Osmanović ; Faculty of Natural Sciences, University of Tuzla, Univerzitetska 4, 75000 Tuzla, Bosnia and Herzegovina
Vera Cesar ; Department of Biology, Josip Juraj Strossmayer University of Osijek, Ulica cara Hadrijana 8/A, 31000 Osijek, Croatia

Sažetak

Despite numerous data dealing with the biogenesis of photosynthetic membranes connected with specific functional alterations in higher plants this is still an insufficiently understood topic and is one of the
most promising areas of research in plant biochemistry. The main goal of our study was to detect the impact of different temperatures on chlorophyll biosynthesis and the maximum quantum yield of PSII (Fv/Fm). Therefore, we investigated the greening processes in etiolated sunfl ower cotyledons (Helianthus annuus L.) grown at different temperatures (10, 20 and 30 °C) during 24 h. The dynamics of chlorophyll a and b (Chl a and Chl b) accumulation as well as photosystem II (PSII) efficiency were observed. We also evaluated combined effects of different temperatures (20 and 30 °C) and short-term application of increased irradiation (800 μmol m–2 s–1) on effective quantum yield of PSII (ΔF/F’m) and non photochemical quenching (NPQ) in cotyledons with fully developed PSII. Our results showed reduced chlorophyll accumulation and the arrest of PSII assembly at 10 °C in comparison with 20 and 30 °C. Further, the increased irradiance induced equal down regulation of effective quantum yield of PSII at 20 and 30 °C, with significantly higher capability of heat dissipation at 30 °C.

Ključne riječi

chlorophyll; chloroplast biogenesis; photosynthesis; photosystem II; thylakoid membranes

Hrčak ID:

179967

URI

https://hrcak.srce.hr/179967

Datum izdavanja:

1.4.2017.

Posjeta: 1.463 *