In planta cleavage of carotenoids by <Emphasis Type="Italic">Arabidopsis</Emphasis> carotenoid cleavage dioxygenase 4 in transgenic rice plants |
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Authors: | Mi-Hee Song Sun-Hyung Lim Jae Kwang Kim Eun Sung Jung K M Maria John Min-Kyoung You Sang-Nag Ahn Choong Hwan Lee Sun-Hwa Ha |
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Institution: | 1.College of Agriculture and Life Sciences,Chungnam National University,Daejeon,Republic of Korea;2.National Academy of Agricultural Science,Rural Development Administration,Jeonju,Republic of Korea;3.Division of Life Sciences and Bio-Resource and Environmental Center,Incheon National University,Incheon,Republic of Korea;4.Department of Bioscience and Biotechnology,Konkuk University,Seoul,Republic of Korea;5.Department of Genetic Engineering and Graduate School of Biotechnology,Kyung Hee University,Yongin,Republic of Korea |
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Abstract: | A family of carotenoid cleavage dioxygenases (CCDs) produces diverse apocarotenoid compounds via the oxidative cleavage of carotenoids as substrates. Their types are highly dependent on the action of the CCD family to cleave the double bonds at the specific position on the carotenoids. Here, we report in vivo function of the AtCCD4 gene, one of the nine members of the Arabidopsis CCD gene family, in transgenic rice plants. Using two independent single-copy rice lines overexpressing the AtCCD4 transgene, the targeted analysis for carotenoids and apocarotenoids showed the markedly lowered levels of β-carotene (74 %) and lutein (72 %) along with the changed levels of two β-carotene (C40) cleavage products, a two-fold increase of β-ionone (C13) and de novo generation of β-cyclocitral (C10) at lower levels, compared with non-transgenic rice plants. It suggests that β-carotene could be the principal substrate being cleaved at 9–10 (9′–10′) for β-ionone and 7–8 (7′–8′) positions for β-cyclocitral by AtCCD4. This study is in planta report on the generation of apocarotenal volatiles from carotenoid substrates via cleavage by AtCCD4. We further verified that the production of these volatiles was due to the action of exogenous AtCCD4 and not the expression of endogenous rice CCD genes (OsCCD1, 4a, and 4b). |
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