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Martin-Luther-Universität Halle-Wittenberg (2019)

Influence of post-anthesis drought stress on germination and malting quality in barley

Surdonja, Korana

Titre : Influence of post-anthesis drought stress on germination and malting quality in barley

Auteur : Surdonja, Korana

Université de soutenance : Martin-Luther-Universität Halle-Wittenberg

Grade : Doktorgrades der Naturwissenschaften (Dr. rer. nat.) 2019

Résumé
Drought is one of the major factors that limit yield and impairs grain quality, while cereal grain germination has a central role in crop propagation and malting. Two malting elite varieties with distinct drought tolerance mechanisms and their double haploid population were tested for germination rates. Grains that had developed on the mother plant under drought condition showed a significant increase in germination rate. Relations of germination rate with malting traits were identified and confirmed by quantitative trait locus (QTL) detection. Abscisic acid (ABA) is the key abiotic stress and dormancy inducing hormone, and its role was studied using ABA manipulated transgenic lines. After terminal drought stress increased ABA degradation is detected in mature grains, which also showed faster germination behaviour. Microarray based transcriptome analysis enabled to identify germination essential transcripts in the embryo and the aleurone layer as well as candidate genes important for malting quality traits.

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Page publiée le 23 mai 2021