Effects of partial root-zone drying and deficit irrigation on yield, irrigation water-use efficiency and some potato (Solanum tuberosum L.) quality traits under glasshouse conditions

Sliman Elhani, Maroua Haddadi, Edina Csákvári, Said Zantar, Ahlam Hamim, Vanda Villányi, Ahmed Douaik, Zsófia Bánfalvi

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Abstract

Agriculture water resources are expected to decline due to increasing water demand and ongoing climate change. In this context, water-saving irrigation techniques, such as partial-root zone drying (PRD) and deficit irrigation (DI) were assessed under glasshouse conditions on potato cultivar Mondial. Four irrigation levels were applied: 50, 70, 80 and 100% of field capacity during 2016 and 2017 growing seasons. The results showed that the yield penalty with PRD was similar to that caused by DI. Nevertheless, PRD plants had higher number of stems and were shorter than DI plants. Sugar and protein contents of tubers gradually decreased with water restriction, however, remained higher in PRD than DI tubers. In contrast, the amounts of polyphenols and antioxidants increased in tubers with decreasing irrigation levels. Untargeted metabolite analysis revealed higher metabolite content of PRD than DI tubers with less decrease in glucose and fructose concentrations and with double amount of mannitol. Transcript level of key-genes involved in carbohydrate metabolism was elevated at 20% water-saving in PRD tubers, but not in DI tubers. We assumed that the detected changes in tubers reflect better adaptation of plants to water-saving irrigation under PRD than DI.

Original languageEnglish
Article number105745
JournalAgricultural Water Management
Volume224
DOIs
Publication statusPublished - Sep 1 2019

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Keywords

  • Antioxidant activity
  • Metabolite
  • Polyphenol
  • Protein
  • Sugar
  • Tuber

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Water Science and Technology
  • Soil Science
  • Earth-Surface Processes

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