Seed filling in domesticated maize and rice depends on SWEET-mediated hexose transport
2015
Sosso, Davide | Luo, Dangping | Li, Qin-Bao | Sasse, Joelle | Yang, Jinliang | Gendrot, Ghislaine, G. | Suzuki, Masaharu | Koch, Karen E. | Mccarty, Donald R. | Chourey, Prem S. | Rogowsky, Peter | Ross-Ibarra, Jeffrey | Yang, Bing | Frommer, Wolf B. | Department of Plant Biology ; Carnegie Institution for Science | Department of Genetics, Development, and Cell Biology ; Iowa State University (ISU) | USDA-ARS : Agricultural Research Service | Department of Plant Sciences ; University of California [Davis] (UC Davis) ; University of California (UC)-University of California (UC) | Reproduction et développement des plantes (RDP) ; École normale supérieure de Lyon (ENS de Lyon) ; Université de Lyon-Université de Lyon-Institut National de la Recherche Agronomique (INRA)-Université Claude Bernard Lyon 1 (UCBL) ; Université de Lyon-Centre National de la Recherche Scientifique (CNRS) | University of Florida [Gainesville] (UF) | University of California [Davis] (UC Davis) ; University of California (UC) | Genome Center ; University of California [Davis] (UC Davis) ; University of California (UC)-University of California (UC) | Office of Basic Energy Sciences of the US Department of Energy [DE-FG02-04ER15542] ; National Science Foundation [IOS-1258018], [IOS-1116561], [IOS-1025976], [IOS-1238014] ; USDA-NIFA [2010-04228]
International audience
Show more [+] Less [-]English. Carbohydrate import into seeds directly determines seed size and must have been increased through domestication. However, evidence of the domestication of sugar translocation and the identities of seed-filling transporters have been elusive. Maize ZmSWEET4c, as opposed to its sucrose-transporting homologs, mediates transepithelial hexose transport across the basal endosperm transfer layer (BETL), the entry point of nutrients into the seed, and shows signatures indicative of selection during domestication. Mutants of both maize ZmSWEET4c and its rice ortholog OsSWEET4 are defective in seed filling, indicating that a lack of hexose transport at the BETL impairs further transfer of sugars imported from the maternal phloem. In both maize and rice, SWEET4 was likely recruited during domestication to enhance sugar import into the endosperm.
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