Wheat-Aegilops biuncialis amphiploids have efficient photosynthesis and biomass production during osmotic stress

Sándor Dulai, István Molnár, Dóra Szopkó, Éva Darkó, András Vojtkó, Andrea Sass-Gyarmati, Márta Molnár-Láng

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Osmotic stress responses of water content, photosynthetic parameters and biomass production were investigated in wheat-Aegilops biuncialis amphiploids and in wheat genotypes to clarify whether they can use to improve the drought tolerance of bread wheat. A decrease in the osmotic pressure of the medium resulted in considerable water loss, stomatal closure and a decreased CO2 assimilation rate for the wheat genotypes, while the changes in these parameters were moderate for the amphiploids. Maximal assimilation rate was maintained at high level even under severe osmotic stress in the amphiploids, while it decreased substantially in the wheat genotypes. Nevertheless, the effective quantum yield of PS II was higher and the quantum yield of non-photochemical quenching of PS II and PS I was lower for the amphiploids than for the wheat cultivars. Parallel with this, higher cyclic electron flow was detected in wheat than in the amphiploids. The elevated photosynthetic activity of amphiploids under osmotic stress conditions was manifested in higher biomass production by roots and shoots as compared to wheat genotypes. These results indicate that the drought-tolerant traits of Ae. biuncialis can be manifested in the wheat genetic background and these amphiploids are suitable genetic materials for improving drought tolerance of wheat.

Original languageEnglish
Pages (from-to)509-517
Number of pages9
JournalJournal of Plant Physiology
Volume171
Issue number7
DOIs
Publication statusPublished - Apr 15 2014

Keywords

  • Aegilops biuncialis
  • Cereals
  • Osmotic stress
  • Photosynthesis
  • Wheat

ASJC Scopus subject areas

  • Physiology
  • Agronomy and Crop Science
  • Plant Science

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