Josip Juraj Strossmayer University of Osijek. Department of biology.
Abstract
Niske temperature mogu predstavljati stresne uvjete za biljke i negativno utjecati na njihove fiziološke i
biokemijske procese kao što je fotosinteza. Cilj ovog rada bio je proučiti utjecaj niske temperature (5°C) na
fotosintetsku učinkovitost Japanskog dvornika (Reynoutria japonica Houtt.) nakon različite duljine izlaganja (1,
2, 4, 6, 8, 16, 24 i 48 sati). U tu svrhu mjerena je fluorescencija klorofila a. Analizom parametra JIP-testa opisan
je prijenos energije reakcijskim središtima fotosustava II te indeks fotosintetske učinkovitosti (PIABS). Kratkotrajna
izlaganja biljaka niskoj temperaturi (1-16 sati) nisu pokazala negativan utjecaj na prijenos energije po aktivnom
reakcijskom središtu, dok je kod dugotrajnijih izlaganja (24 i 48 sati) niska temperatura dovela do stvaranja
neaktivnih, odnosno „utišanih“ reakcijskih središta. Smanjenje indeksa fotosintetske učinkovitosti (PIABS) već pri
kratkom izlaganju niskoj temperaturi ukazuje na ograničenje prijenosa elektrona dalje od primarnog akceptora u
transportnom lancu elektrona.Low temperatures can present stressful conditions for some plants and it can have a negative effect on their
physiological and biochemical processes such as photosynthesis. The aim of this study was to determine the effect
of low temperature (5°C) on photosynthetic efficiency of Japanese knotweed (Reynoutria japonica Houtt.) after
different length of exposure (1, 2, 4, 8, 16, 24 and 48 hours) on its.). To determine the parameters of photosynthetic
efficiency, the chlorophyll a fluorescence was measured. The analysis of JIP test parameters described the energy
transfer through reaction centres of photosystem II and the performance index (PIABS). Short-term exposures of
plants to low temperature (1-16 hours) did not show a negative impact on energy fluxes per active reaction centre,
while longer exposures (24 and 48 hours) to low temperature caused the formation of inactive or "silent" ones.
The decrease of performance index (PIABS) even at short exposure to low temperature indicated a limitation of
electron transport after the primary acceptor in the electron transport chain
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