title: Trehalose 6-phosphate signal is closely related to sorbitol in apple (Malus domesticaBorkh. cv. Gala).
abstract: Trehalose-6-phosphate (Tre6P) is a precursor of trehalose, which is widespread in nature and greatly influences plant growth and development. Tre6P acts as a signal of carbon availability in many plants, but little is known about the function of Tre6P in rosaceous plants, which have specific sorbitol biosynthesis and transportation pathways. In the present study, Tre6P levels and Sorbitol:Tre6P ratios were analyzed in apple (Malus domestica, Borkh. cv. Gala). Tre6P levels were positively correlated with sorbitol content but negatively correlated with sucrose, glucose, and fructose content in developing fruit. However, under sorbitol-limited conditions, Tre6P levels were positively correlated with both sorbitol and sucrose. In the presence of different exogenous sugar supply, Tre6P levels increased corresponding with sorbitol, but this was not the case with sucrose. In addition, Tre6P content and sorbitol:Tre6P ratios were more highly correlated with ADP-glucose levels under sorbitol-limited conditions and fruit development stages, respectively. These results suggest that Tre6P is more closely related to sorbitol than other soluble sugars and has an important role in influencing carbon metabolism in apple.
authors.affiliation: College of Horticulture, Northwest A&F University, Yangling, Shaanxi 712100, China.
authors.forename: Wen
authors.initials: W
authors.lastname: Zhang
authors.affiliation: Max Planck Institute of Molecular Plant Physiology, Metabolic Networks Group, Am Mühlenberg 1, Potsdam-Golm D-14476, Germany.
authors.forename: John E
authors.initials: JE
authors.lastname: Lunn
authors.affiliation: Max Planck Institute of Molecular Plant Physiology, Metabolic Networks Group, Am Mühlenberg 1, Potsdam-Golm D-14476, Germany.
authors.forename: Regina
authors.initials: R
authors.lastname: Feil
authors.affiliation: College of Horticulture, Northwest A&F University, Yangling, Shaanxi 712100, China.
authors.forename: Yufei
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Key Laboratory of Horticulture Plant Biology and Germplasm Innovation in Northwest China, Ministry of Agriculture, Northwest A&F University, Yangling, Shaanxi 712100, China.
authors.forename: Jingjing
authors.initials: J
authors.lastname: Zhao
authors.affiliation: College of Horticulture, Northwest A&F University, Yangling, Shaanxi 712100, China.|Key Laboratory of Horticulture Plant Biology and Germplasm Innovation in Northwest China, Ministry of Agriculture, Northwest A&F University, Yangling, Shaanxi 712100, China.
authors.forename: Hongxia
authors.initials: H
authors.lastname: Tao
authors.affiliation: College of Horticulture, Northwest A&F University, Yangling, Shaanxi 712100, China ypguo@nwsuaf.edu.cn.|Key Laboratory of Horticulture Plant Biology and Germplasm Innovation in Northwest China, Ministry of Agriculture, Northwest A&F University, Yangling, Shaanxi 712100, China.
authors.forename: Yanping
authors.identifier: http://orcid.org/0000-0002-2301-622X
authors.initials: Y
authors.lastname: Guo
authors.affiliation: College of Horticulture, Northwest A&F University, Yangling, Shaanxi 712100, China.|Shaanxi Engineering Research Center for Apple, Northwest A&F University, Yangling, Shaanxi 712100, China.
authors.forename: Zhengyang
authors.initials: Z
authors.lastname: Zhao
keywords: Apple; Signaling; Sorbitol; Sugar; Tre6P