TY  - CONF
AU  - Vidović, Marija
AU  - Morina, Filis
AU  - Milić Komić, Sonja
AU  - Albert, Andreas
AU  - Zechmann, Bernd
AU  - Tosti, Tomislav
AU  - Winkler, Jana Barbro
AU  - Veljović-Jovanović, Sonja
AU  - Barbro winkler
PY  - 2015
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/1878
AB  - In this study we investigated the specific effects of high photosynthetically active radiation (PAR) and ecologically
relevant UV-B radiation (0.90 W m-2) on antioxidative, phenolic and sugar metabolism in variegated
Pelargonium zonale plants. The green-white leaf variegation in these plants presents a suitable model system
for examining “source-sink” interactions within the same leaf. High PAR (1350 μmol m-2 s-1) and UV-B radiation
induced tissue specific responses in variegated P. zonale leaves. While UV-B radiation had a pronounced effect
on phenolic content in the white tissue, high PAR intensity stimulated accumulation of phenylpropanoids
and flavonoids with preferential antioxidative vs. UV-screening function in green tissue. High PAR stimulated
the increase of antioxidative metabolism in both leaf sections. However, the greater enhancement of ascorbate
peroxidase and catalase activities and ascorbate content under HL+UV-B than HL only in green sectors,
indicated that UV-B radiation and high PAR synergistically stimulated antioxidative defense. These results indicate
that green tissue can be considered as high light acclimated, provided with an efficient defense against
potential oxidative pressure under high PAR, along with significant protective role of UV-B radiation. Efficient
sugar transport from green to white tissue was stimulated by both UV-B radiation and high PAR intensity. By
stimulation of starch and sucrose breakdown and carbon allocation in the form of soluble sugars from “source”
(green) tissue to “sink” (white) tissue, UV-B radiation stimulates a compensatory mechanism for phenylpropanoid
and flavonoid biosynthesis in white tissue, due to the lack of photosynthesis.
PB  - Serbian Plant Physiology Society
PB  - Institute for Biological Research “Siniša Stanković” – National Institute of Republic of Serbia, University of Belgrade
C3  - 2nd International Conference on Plant Biology • 21st Symposium of the Serbian Plant Physiology Society • COST ACTION FA1106 QUALITYFRUIT Workshop Petnica Science Center 17-20 june, 2015
T1  - High PAR and UV-B radiation-induced differential responses in green and white leaf sectors of Pelargonium zonale in relation to sugar, antioxidative and phenolic metabolism
SP  - 154
UR  - https://hdl.handle.net/21.15107/rcub_rimsi_1878
ER  - 

@conference{
author = "Vidović, Marija and Morina, Filis and Milić Komić, Sonja and Albert, Andreas and Zechmann, Bernd and Tosti, Tomislav and Winkler, Jana Barbro and Veljović-Jovanović, Sonja and Barbro winkler",
year = "2015",
abstract = "In this study we investigated the specific effects of high photosynthetically active radiation (PAR) and ecologically
relevant UV-B radiation (0.90 W m-2) on antioxidative, phenolic and sugar metabolism in variegated
Pelargonium zonale plants. The green-white leaf variegation in these plants presents a suitable model system
for examining “source-sink” interactions within the same leaf. High PAR (1350 μmol m-2 s-1) and UV-B radiation
induced tissue specific responses in variegated P. zonale leaves. While UV-B radiation had a pronounced effect
on phenolic content in the white tissue, high PAR intensity stimulated accumulation of phenylpropanoids
and flavonoids with preferential antioxidative vs. UV-screening function in green tissue. High PAR stimulated
the increase of antioxidative metabolism in both leaf sections. However, the greater enhancement of ascorbate
peroxidase and catalase activities and ascorbate content under HL+UV-B than HL only in green sectors,
indicated that UV-B radiation and high PAR synergistically stimulated antioxidative defense. These results indicate
that green tissue can be considered as high light acclimated, provided with an efficient defense against
potential oxidative pressure under high PAR, along with significant protective role of UV-B radiation. Efficient
sugar transport from green to white tissue was stimulated by both UV-B radiation and high PAR intensity. By
stimulation of starch and sucrose breakdown and carbon allocation in the form of soluble sugars from “source”
(green) tissue to “sink” (white) tissue, UV-B radiation stimulates a compensatory mechanism for phenylpropanoid
and flavonoid biosynthesis in white tissue, due to the lack of photosynthesis.",
publisher = "Serbian Plant Physiology Society, Institute for Biological Research “Siniša Stanković” – National Institute of Republic of Serbia, University of Belgrade",
journal = "2nd International Conference on Plant Biology • 21st Symposium of the Serbian Plant Physiology Society • COST ACTION FA1106 QUALITYFRUIT Workshop Petnica Science Center 17-20 june, 2015",
title = "High PAR and UV-B radiation-induced differential responses in green and white leaf sectors of Pelargonium zonale in relation to sugar, antioxidative and phenolic metabolism",
pages = "154",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_1878"
}

Vidović, M., Morina, F., Milić Komić, S., Albert, A., Zechmann, B., Tosti, T., Winkler, J. B., Veljović-Jovanović, S.,& Barbro winkler. (2015). High PAR and UV-B radiation-induced differential responses in green and white leaf sectors of Pelargonium zonale in relation to sugar, antioxidative and phenolic metabolism. in 2nd International Conference on Plant Biology • 21st Symposium of the Serbian Plant Physiology Society • COST ACTION FA1106 QUALITYFRUIT Workshop Petnica Science Center 17-20 june, 2015
Serbian Plant Physiology Society., 154.
https://hdl.handle.net/21.15107/rcub_rimsi_1878

Vidović M, Morina F, Milić Komić S, Albert A, Zechmann B, Tosti T, Winkler JB, Veljović-Jovanović S, Barbro winkler. High PAR and UV-B radiation-induced differential responses in green and white leaf sectors of Pelargonium zonale in relation to sugar, antioxidative and phenolic metabolism. in 2nd International Conference on Plant Biology • 21st Symposium of the Serbian Plant Physiology Society • COST ACTION FA1106 QUALITYFRUIT Workshop Petnica Science Center 17-20 june, 2015. 2015;:154.
https://hdl.handle.net/21.15107/rcub_rimsi_1878 .

Vidović, Marija, Morina, Filis, Milić Komić, Sonja, Albert, Andreas, Zechmann, Bernd, Tosti, Tomislav, Winkler, Jana Barbro, Veljović-Jovanović, Sonja, Barbro winkler, "High PAR and UV-B radiation-induced differential responses in green and white leaf sectors of Pelargonium zonale in relation to sugar, antioxidative and phenolic metabolism" in 2nd International Conference on Plant Biology • 21st Symposium of the Serbian Plant Physiology Society • COST ACTION FA1106 QUALITYFRUIT Workshop Petnica Science Center 17-20 june, 2015 (2015):154,
https://hdl.handle.net/21.15107/rcub_rimsi_1878 .