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Carl-Otto Ottosen

Drought priming effects on alleviating later damages of heat and drought stress in different wheat cultivars

Publikation: KonferencebidragPosterForskning

The ongoing change is climate; in particular the increase of drought and heat waves episodes are a major challenge in the prospect of food safety. Under many field conditions, plants are usually exposed to mild intermittent stress episodes rather than a terminal stress event. Previous, but limited studies suggest that plants subjected to early stress (primed) can be more resistant to future stress exposure than those not stressed during seedling stage.

In our experiment we aimed to test if repeated mild drought stresses could improve heat and drought tolerance during anthesis heat and drought stresses in wheat cultivars. Two wheat cultivars, Gladius and Paragon, were grown in a fully controlled gravimetric platform and subjected to either no stress (control) or two (P) drought cycles during seedling stage, at three and five complete developed leaves. Each cycle consisted of withholding water until 35% of soil relative water capacity (SRWC) was reach. At anthesis, both batches were then subject to either a high temperature stress (32/28oC), drought stress (SRWC of 25%), or kept as control treatments. As result, 6 treatments were established after the high temperature/drought stress for each cultivar.

Gas exchange and chlorophyll fluorescence were used to investigate the physiological performance of plants. Light response curves showed no difference in assimilation for Gladius and a decrease in assimilation for drought non-primed plants in Paragon. Stresses treatments in Gladius increased the saturated photosynthetic rate when compared with control plants but no effect of priming was detected to suggest an alleviating effect in wheat plants. Both cultivars showed a decrease in non-photochemical quenching (NPQ) and an increase in the actual photochemical efficiency of PSII (ϕPSII) in primed plants during heat stress. While Gladius drought primed plants showed no difference, a tendency of increase in NPQ and decrease of ϕPSII was observed in primed plants of Paragon during drought stress. Results shows a difference in behavior between cultivars, Gladius performed as both a heat and drought tolerant cultivar, while Paragon was perceived as heat and drought sensitive cultivar.

TM acknowledges financial support from CAPES Scholarship and Science without Borders program, grant no. 002108/2015-01. Funded by the FP7 JPI-FACCE-ERANET + Modcarbo-stress, grant agreement n° 618105.

OriginalsprogEngelsk
Udgivelsesår29 sep. 2017
StatusUdgivet - 29 sep. 2017
BegivenhedCOST WG1 / EPPN2020 workshop: Current and future applications of phenotyping for plant breeding - Novi Sad, Serbien
Varighed: 29 sep. 201730 sep. 2017

Konference

KonferenceCOST WG1 / EPPN2020 workshop: Current and future applications of phenotyping for plant breeding
LandSerbien
ByNovi Sad
Periode29/09/201730/09/2017

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