title: Changes in sugar content and related enzyme activities in table grape (Vitis vinifera L.) in response to foliar selenium fertilizer.
abstract: BACKGROUND
  Spraying selenium (Se) fertilizer is an effective method for Se-enriched fruit production. Sugar content in fruit is the major factor determining berry quality. However, changes in sugar metabolism in response to Se fertilizer are unclear. Hence, this study was conducted to identify the effects of Se fertilizer on sugar metabolism and related enzyme activities of grape berries. Additionally, production of leaves with and without Se fertilizer was also investigated.
  
  
  RESULTS
  Acid invertase (AI) activity, total soluble sugar and Se content in berries, and photosynthetic rate in leaves produced under Se fertilizer treatments were higher than that of control. Glucose and fructose were the primary sugars in berries, with a trace of sucrose. In both berries and leaves, neutral invertase activity was lower than AI, there was no significant difference in neutral invertase, sucrose synthase and sucrose phosphate synthase between Se fertilizer-treated and control. In berries, AI showed a significant positive correlation with glucose and fructose; also Se content was significantly correlated with sugar content.
  
  
  CONCLUSIONS
  AI played an important role in the process of sugar accumulation in berries; high AI activity in berries and photosynthetic rate in leaves could explain the mechanism by which Se fertilizer affected sugar accumulation in berries. © 2017 Society of Chemical Industry.
authors.affiliation: Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi, China.
authors.forename: Shuaimeng
authors.initials: S
authors.lastname: Zhu
authors.affiliation: Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi, China.|Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi, China.
authors.forename: Yinli
authors.initials: Y
authors.lastname: Liang
authors.affiliation: Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi, China.
authors.forename: Xiaojuan
authors.initials: X
authors.lastname: An
authors.affiliation: Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi, China.
authors.forename: Fanchao
authors.initials: F
authors.lastname: Kong
authors.affiliation: Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi, China.
authors.forename: Dekai
authors.initials: D
authors.lastname: Gao
authors.affiliation: Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi, China.
authors.forename: Hongfei
authors.initials: H
authors.lastname: Yin
mesh_terms: D050260:Carbohydrate Metabolism; D002241:Carbohydrates / Q000737:chemistry*; D005308:Fertilizers / Q000032:analysis; D005638:Fruit / Q000737:chemistry* / Q000201:enzymology / Q000254:growth & development / Q000378:metabolism; D010940:Plant Proteins / Q000032:analysis* / Q000378:metabolism; D012643:Selenium / Q000032:analysis* / Q000378:metabolism; D027843:Vitis / Q000737:chemistry* / Q000201:enzymology / Q000254:growth & development / Q000378:metabolism; D043324:beta-Fructofuranosidase / Q000032:analysis* / Q000378:metabolism
chemical_list: D002241:Carbohydrates; D005308:Fertilizers; D010940:Plant Proteins; D043324:beta-Fructofuranosidase; D012643:Selenium
keywords: Hutai No. 08; dynamic change; metabolic enzymes; sugar components