The present invention relates to a composition for promoting cytokinin transport, comprising an ABCG14 protein of a plant or a gene encoding the same. More specifically, the present invention relates to a composition comprising an ABCG14 protein or a gene encoding the same for promoting cytokinin transport from the roots to aerial parts of a plant, a method for promoting cytokinin transport from the roots to aerial parts of a plant, comprising the step of transforming the plant with an expression vector with the gene inserted therein, and a method for increasing biomass in the aerial parts and for reducing carbon dioxide in the atmosphere using the ABCG14 protein. The present invention can provide a method of transporting cytokinin, which is a plant hormone that controls the overall development and growth of a plant, from the roots to the aerial parts by identifying a new transporter that plays an important role in long distance transport of cytokinin. Accordingly, there is an advantage that the overall development of the aerial parts (the leaf size of the plant, the stem length and thickness (development of xylem and phloem), the biomass and the size and number of seeds) can be effectively facilitated or controlled.La présente invention concerne une composition dencouragement de transport de cytokinine, comprenant une protéine ABCG14 dune plante ou un gène la codant. Plus spécifiquement, la présente invention concerne une composition comprenant une protéine ABCG14 ou un gène la codant pour encourager le transport de cytokinine des racines aux parties aériennes dune plante, une méthode dencouragement du transport de cytokinine des racines aux parties aériennes dune plante, comprenant létape de transformation de la plante avec un vecteur dexpression avec le gène inséré dedans, et une méthode permettant daugmenter la biomasse dans les parties aériennes et de réduire le dioxyde de carbone dans latmosphère en utilisant la protéine ABCG14. La présente invention peut four
