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Acta Horticulturae Sinica ›› 2023, Vol. 50 ›› Issue (5): 959-971.doi: 10.16420/j.issn.0513-353x.2022-0190

• Genetic & Breeding·Germplasm Resources·Molecular Biology • Previous Articles     Next Articles

Molecular Mechanism Study of Exogenous Sorbitol Effects on Sugar Metabolism in Peach Leaves and Fruits

ZHOU Ping, GUO Rui, YAN Shaobin, JIN Guang()   

  1. Fruit Research Institute,Fujian Academy of Agricultural Sciences,Fuzhou 350013,China
  • Received:2022-11-03 Revised:2023-04-27 Online:2023-05-25 Published:2023-05-31
  • Contact: JIN Guang E-mail:jinguang0591@163.com

Abstract:

To explore the effects of exogenous sorbitol on leaves and fruits of peach(Prunus persica),the metabolomics and transcriptomics were integrated to investigate changes in sugar(sucrose,glucose,fructose,and sorbitol)contents and expression levels of genes involved in sugar metabolism and transportation as well as relevant metabolic pathways. The results have shown that sucrose,glucose,and fructose contents increased,while there was no difference in sorbitol content in leaves under sorbitol treatment. However,sorbitol content decreased while other sugar contents remained constant in the flesh under sorbitol treatment. Furthermore,content ratios of sucrose/glucose,sucrose/fructose,sorbitol/glucose,sorbitol/fructose,and sorbitol/sucrose were dramatically declined in both leaves and the flesh. Transcriptional patterns of leaves and the flesh under exogenous sorbitol treatment were distinct,in which sugar-related genes including sugar-metabolizing enzymes(PpSDHb,PpPFKa/b/e,PpHXKa,PpSUSb/c and PpINVe)and sugar transporters(PpSOTa/I and PpSWEET10/13),mediated the sucrose,glucose,fructose and sorbitol accumulation in different organs. Transcriptomic analyses confirmed that differentially expressed genes were overrepresented in sugar metabolism-related pathways(including starch and sucrose metabolism in leaves and carbon metabolism in fruits)and other secondary metabolism processes. Our study suggested that exogenous sorbitol influenced soluble sugar contents and sugar composition balance of peach leaves and flesh differently. The leaves- and fruits-specific transcriptional changes of sugar-metabolizing and sugar transporting genes fine-tuned the sugar metabolism.

Key words: peach, leaf, fruit, exogenous sorbitol, sugar metabolism, molecular mechanism

CLC Number: