Drought tolerance in four-day-old seedlings of a drought-sensitive cultivar of wheat

Parisa Koobaz, Faezeh Ghanati*, Ghasem Hosseini Salekdeh, Foad Moradi, Hossein Hadavand

*Corresponding author for this work

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Four-day-old seedlings of spring wheat (Triticum aestivum L. cv. Marvdasht) can tolerate severe dehydration and recover after re-watering. In order to clarify tolerance mechanism, in a completely randomized design, the seedlings were exposed to drought by complete water cessation for 10 and 20 days, followed by re-watering for 3 and 7 days. Upon dehydration, the activity of α-amylase increased whereas growth parameters; photosynthetic pigments; and the activities of lipoxygenase, indole acetic acid (IAA) oxidase, and ascorbate peroxidase (APX) decreased. The activity of APX and the expression of its gene, however, increased after re-watering. Prolonged dehydration was also accompanied by increase in sucrose, soluble proteins, fructans, and certain amino acids, e.g. proline, glutamine, and valine. The results indicated that during dehydration, 4-day-old wheat seedlings shifted their energy expenditure from basal metabolism to withstand water deficiency via lowering the activity of membrane-damaging enzymes and enhancing the production of osmoprotectants.

Original languageEnglish
Pages (from-to)574-583
Number of pages10
JournalJournal of Plant Nutrition
Volume40
Issue number4
DOIs
Publication statusPublished - 2017
Externally publishedYes

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Keywords

  • drought stress
  • fructan
  • proline
  • re-watering
  • wheat

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