Drought priming effects on alleviating the photosynthetic limitations of wheat cultivars (Triticum aestivum L.) with contrasting tolerance to abiotic stresses

Thayna Mendanha*, Eva Rosenqvist, Benita Nordentoft Hyldgaard, John H. Doonan, Carl Otto Ottosen

*Corresponding author for this work

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Abstract

Abiotic stress tolerance in plants is said to be induced by pre-stress events (priming) during the vegetative phase. We aimed to test whether drought priming could improve the heat and drought tolerance in wheat cultivars. Two wheat cultivars “Gladius” and “Paragon” were grown in a fully controlled gravimetric platform and subjected to either no stress or two drought cycles during the tillering stage. At anthesis, both batches were either subjected to high temperature stress, drought stress or kept as control. No alleviation of grain yield reduction due to priming was observed. Higher CO2 assimilation rates were achieved due to priming under drought stress. Yield results showed that priming was not damage cumulative to wheat. Priming was responsible to alleviated biochemical photosynthetic limitations under drought stress and sustained photochemical utilization under heat stress in “Paragon.” Priming as a strategy in abiotic stress alleviation was better evidenced in the stress susceptible cultivar “Paragon” than tolerant cultivar “Gladius”; therefore, the type of response to priming appears to be cultivar dependable, and thus phenotypical variation should be expected when studying the effects of abiotic priming.
Original languageEnglish
Pages (from-to)651-664
Number of pages14
JournalJournal of Agronomy and Crop Science
Volume206
Issue number6
Early online date20 Apr 2020
DOIs
Publication statusPublished - 27 Nov 2020

Keywords

  • chlorophyll fluorescence
  • gas exchange
  • grain yield
  • heat stress
  • photosynthesis
  • stomatal conductance

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