We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
Glucose sensor MdHXK1 activates an immune response to the fungal pathogen Botryosphaeria dothidea in apple.
- Authors
Jian-Qiang Yu; Xiu-Ming Li; Wen-Yan Wang; Kai-Di Gu; Cui-Hui Sun; Chun-Xiang You; Da-Gang Hu
- Abstract
Sugars are essential regulatory molecules involved in plant growth and development and defense response. Although the relationship between sugars and disease resistance has been widely discussed, the underlying molecular mechanisms remain unexplored. Ring rot caused by Botryosphaeria dothidea (B. dothidea), which severely affects fruit quality and yield, is a destructive disease of apples (Malus domestica Borkh.). The present study found that the degree of disease resistance in apple fruit was closely related to glucose content. Therefore, the gene encoding a hexokinase, MdHXK1, was isolated from the apple cultivar 'Gala', and characterized during the defense response. Overexpression of MdHXK1 enhanced disease resistance in apple calli, leaves and fruits by increasing the expression levels of genes related to salicylate (SA) synthesis (PHYTOALEXIN DEFICIENT 4, PAD4; PHENYLALANINE AMMONIALYASE, PAL; and ENHANCED DISEASE SUSCEPTIBILITY 1, EDS1) and signaling (PR1; PR5; and NONEXPRESSER OF PR GENES 1, NPR1) as well as increasing the superoxide (O2-) production rate and the hydrogen peroxide (H2O2) content. Overall, the study provides new insights into the MdHXK1-mediated molecular mechanisms by which glucose signaling regulates apple ring rot resistance.
- Subjects
IMMUNE response; GLUCOSE; NATURAL immunity; ORCHARDS; PLANT growth; PLANT development; APPLES
- Publication
Physiologia Plantarum, 2022, Vol 174, Issue 1, p1
- ISSN
0031-9317
- Publication type
Article
- DOI
10.1111/ppl.13596