Sucrose transport from source to sink seeds in rice |
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Authors: | Jung Dae Lim Jung-Il Cho Youn-Il Park Tae-Ryong Hahn Sang-Bong Choi Jong-Seong Jeon |
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Institution: | Department of Biological Sciences, Myongji University, Yongin 449-728, Korea; Plant Metabolism Research Center &Graduate School of Biotechnology, Kyung Hee University, Yongin 449-701, Korea; Department of Biology, Chungnam National University, Daejeon 305-764, Korea |
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Abstract: | In many higher plants, sucrose is loaded as a major carbon photoassimiliate into the phloem apoplastically by sucrose transporters (SUTs) and unloaded in sink tissues, where it serves as a storage material, carbohydrate backbone, and energy source. In sink tissues, a proportion of sucrose molecules are converted by cell wall invertases (CINs) into hexose that is imported into cells by monosaccharide transporters (MSTs). Thus, in developing seeds, co-ordinated regulation of SUTs, CINs, and MSTs is crucial in carbon distribution. Here, we summarize current efforts on the identification of SUTs, CINs, and MSTs in rice. |
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