title: Sugar metabolism in relation to chilling tolerance of loquat fruit.
abstract: The relationship between chilling injury and sugar metabolism was investigated in loquat fruit stored at 1°C for 35days. No symptoms of chilling injury occurred in the fruit, of 'Ninghaibai' cultivar, during the whole storage whereas, in 'Dahongpao' fruit, severe chilling symptoms were observed after 20days of storage at 1°C. 'Ninghaibai' fruit had higher levels of glucose and fructose and higher activities of sucrose hydrolyzing enzymes, such as sucrose synthase-cleavage and invertase, than had 'Dahongpao'. Furthermore, the chilling resistant 'Ninghaibai' fruit also showed higher activities of hexokinase and fructokinase, involved in hexose phoshorylation and sugar signal generation. These results suggest that the higher content of hexoses and activities of hexose sensors were likely part of the mechanism for chilling tolerance of loquat fruit.
authors.affiliation: Nanjing Research Institute for Agricultural Mechanization, Ministry of Agriculture, Nanjing 210014, People's Republic of China.
authors.forename: Shifeng
authors.initials: S
authors.lastname: Cao
authors.forename: Zhenfeng
authors.initials: Z
authors.lastname: Yang
authors.forename: Yonghua
authors.initials: Y
authors.lastname: Zheng
mesh_terms: D050260:Carbohydrate Metabolism; D002241:Carbohydrates / Q000032:analysis; D003080:Cold Temperature; D031983:Eriobotrya / Q000737:chemistry / Q000201:enzymology / Q000378:metabolism*; D061353:Food Storage; D005632:Fructose / Q000032:analysis / Q000378:metabolism; D005638:Fruit / Q000737:chemistry* / Q000201:enzymology / Q000378:metabolism*; D005947:Glucose / Q000032:analysis / Q000378:metabolism; D005964:Glucosyltransferases / Q000378:metabolism; D010940:Plant Proteins / Q000378:metabolism; D043324:beta-Fructofuranosidase / Q000378:metabolism
chemical_list: D002241:Carbohydrates; D010940:Plant Proteins; D005632:Fructose; D005964:Glucosyltransferases; C022699:sucrose synthase; D043324:beta-Fructofuranosidase; D005947:Glucose