Pre-harvest climate and post-harvest acclimation to cold prevent from superficial scald development in Granny Smith apples

Sci Rep. 2020 Apr 10;10(1):6180. doi: 10.1038/s41598-020-63018-3.

Abstract

Superficial scald is one of the most serious postharvest physiological disorders that can affect apples after a prolonged cold storage period. This study investigated the impact of pre- and post-harvest climatic variations on superficial scald in a susceptible apple cultivar. Fruit batches with contrasting phenotypes for superficial scald incidence were identified among several years of "Granny Smith" fruit production. The "low scald" year pre-harvest climate was characterised by a warm period followed by a sudden decrease in temperature, playing the part of an in vivo acclimation to cold storage. This was associated with many abiotic stress responsive genes which were induced in fruit peel. In particular 48 Heat Shock Proteins (HSPs) and 5 Heat Shock transcription Factors (HSFs) were strongly induced at harvest when scald incidence was low. For "high scald" year, a post-harvest acclimation of 1 week was efficient in reducing scald incidence. Expression profiles of stress related genes were affected by the acclimation treatment and indicate fruit physiological adaptations to cold storage. The identified stress-responsive genes, and in particular HSPs, could be useful indicators of the fruit physiological status to predict the risk of scald occurrence as early as harvest.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Acclimatization / physiology*
  • Climate
  • Cold Temperature / adverse effects*
  • Food Preservation*
  • Fruit / physiology
  • Gene Expression Regulation, Plant / physiology
  • Heat-Shock Proteins / genetics
  • Incidence
  • Malus / physiology*
  • Plant Diseases / prevention & control*
  • Plant Diseases / statistics & numerical data
  • Stress, Physiological
  • Transcription Factors / metabolism

Substances

  • Heat-Shock Proteins
  • Transcription Factors