Understanding the adaptive physiological and morphological responses of wheat to selected combinations of abiotic stress caused by climate change.

Publikation: Bog/antologi/afhandling/rapportPh.d.-afhandlingForskning

The frequency of heat and drought events are expecting to increase in the next years. Yet, actual crop models predicting best allele/phene combinations and ap-propriate management systems fail to take in consideration aspects like stress combination and the predict rise in atmospheric [CO2]. The MODCARBOSTRESS project, of which this PhD. project is part of, proposed to fill the gaps in knowledge regarding: a) the beneficial/detrimental effects of increasing [CO2]; b) the role of acclimation to abiotic stresses; and c) the abiotic stress combination faced by crops in the field. In order to attend the demands raised by the project, this PhD. project proposed to advance the understanding of the role of abiotic priming as a stress alleviation phenomenon. Two genotypes of wheat (Triticum aestivum L.) with con-trasting tolerance were used in a set of experiments, aimed to: 1) investigate the stress alleviation effects of heat and drought priming; 2) document the photosyn-thetic performance, stomatal behaviour, grain yield and morphological character-istics; and 3) evaluate the genotypic responses to both priming and abiotic stresses responses in wheat. Gas exchange and chlorophyll fluorescence were used as non-destructive methods to access the difference photosynthetic responses to priming and abiotic stress. The results obtained on this thesis showed that the effects of priming on improving plant’s tolerance are dependable on its type (heat or drought), cultivar (contrasting tolerance), duration, timing and intensity. This thesis could contribute to elucidate the genotypic dependence of priming. Our findings showed that drought priming could enhance tolerance within plant’s life cycle and, at the same time, cause no cost in grain yield under non-stressed condi-tions. In addition, it contributed to a better understanding of the effects of repeat-ed stresses (priming) on spring wheat and provided morphological and physiologi-cal understanding of plant’s behavior facing the future changes in climate.
OriginalsprogEngelsk
Antal sider132
StatusUdgivet - 21 okt. 2018

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