Response of Peanuts (Arachis hypogaea L.) grown in Saline Nutrient Solution to Potassium Nitrate

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9 Scopus citations

Abstract

The use of KNO3 as a means to reduce salt damage to peanuts (Arachis hypogaea L.) was tested in sprayhydroponics (aeroponics) with 50 mM NaCl and 1, 3, 5, 7, and 9 mM KNO3. The addition of KNO3 caused an increase in dry weight of the shoot, root length, chlorophyll content, nitrate reductase activity, and the reduction of salt injury symptoms in the leaves with an optimum at 5–;7 mM KNO3. None of these factors was correlated with proline content. Mean root diameter was abnormally thick in low KN03 concentrations and became thinner in higher KNO3 concentrations, reaching the lowest value at about 6 mM KNO3. Concentrations of Na+ and CI- in the shoot, but not in the root, decreased with the increase in KNO3 concentration. It is suggested that K+ and NO3 - inhibited Na+ and CI- translocation from the roots to the shoots so that leaf metabolism was protected against salt damage.

Original languageEnglish
Pages (from-to)229-233
Number of pages5
JournalJournal of Plant Physiology
Volume132
Issue number2
DOIs
StatePublished - 1 Jan 1988

Keywords

  • Arachis hypogaea
  • Chlorophyll
  • EDDHA
  • Hydroponics
  • Ion interaction
  • NR
  • Nitrate reductase
  • Peanuts
  • Potassium nitrate
  • Proline
  • Salinity
  • Sodium chloride
  • ethylenediamine di-o-hydroxyphenyl acetic acid;
  • nitrate reductase

ASJC Scopus subject areas

  • Physiology
  • Agronomy and Crop Science
  • Plant Science

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