Root-Applied Glycinebetaine Decreases Nitrate Accumulation and Improves Quality in Hydroponically Grown Lettuce

Kari Jokinen, Anna-Kaisa Johanna Salovaara, Daniel Wasonga, Minnamari Edelmann, Ilkka Simpura, Pirjo Mäkelä

Research output: Contribution to journalArticlepeer-review

Abstract

Leafy vegetables like lettuce (Lactuca sativa L.) naturally have high nitrate content and the European Commission has set maximum level for nitrate in lettuce. Glycinebetaine is an organic osmolyte alleviating plant stress, but its role in leaf nitrate accumulation remains unknown. The uptake of glycinebetaine by lettuce roots, and its potential to regulate lettuce nitrate content and improve plant quality were investigated. Two hydroponic lettuce experiments were conducted with different glycinebetaine application rates (Exp1 : 0, 1, 7.5, and 15 mM; Exp2: 0, 1 + 1 + 1, 1 + 10, and 4 mM). Plants were analyzed at varying time points. Root application resulted in glycinebetaine uptake and translocation to the leaves. Glycinebetaine concentrations > 7.5 mM reduced leaf nitrate up to 40% and increased leaf dry matter content. Glycinebetaine showed a positive effect on leaf mineral and amino acid composition. Thus, glycinebetaine could be a novel strategy to reduce the nitrate content in hydroponic lettuce.

Original languageEnglish
Article number130558
JournalFood Chemistry
Volume366
Number of pages9
ISSN0308-8146
DOIs
Publication statusPublished - 1 Jan 2022
MoE publication typeA1 Journal article-refereed

Fields of Science

  • 4111 Agronomy
  • Amino acid
  • Growth
  • Lactuca sativa
  • Minerals
  • Nutrient film technology
  • EXOGENOUS APPLICATION
  • NITROGEN FORMS
  • AMINO-ACIDS
  • BETAINE
  • ASSIMILATION
  • LEAVES
  • FRUITS
  • RED

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