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Imprint
Collaborative project: Development of a marker-assisted improvement of drought tolerance in faba bean - subproject 3
Project
Project code: 2814506110
Contract period: 01.02.2011
- 31.01.2014
Budget: 45,790 Euro
Purpose of research: Experimental development
The determination of drought stress relevant traits, i.e. leaf water content, chlorophyll content (SPAD), membrane stability, content of soluble sugars, proline and glycine betaine in 200 faba bean lines under controlled conditions in the lab revealed a significant effect of the applied osmotic stress on all traits analyzed as well as significant genotypic differences and genotype x stress treatment interaction, indicating that the genotypes responded differently to the applied stress. Positive correlations were estimated between membrane stability and the leaf water content as well as to the accumulation of soluble sugars, while membrane stability was negatively correlated to the proline and glycine betaine content. Corresponding to this finding, glycine betaine was negatively correlated to the leaf water content. The same was observed for the proline content and the content of soluble sugars. For the validation of physiological markers with respect to their relevance for yield formation under drought stress conditions in the field, 44 inbred lines out of the 200 genotypes tested were investigated in rain out shelter trials. In these trials genotypic differences in the reaction to drought stress were detected regarding 13C values, which are an indicator for water use efficiency.. Number of grains per plant was mostly influenced by end-terminated drought stress beginning at flowering leading to yield reductions. No strong correlations of physiological traits determined in the lab to drought induced yield losses under field conditions were detected. This could be either due to the complexity of drought tolerance, but also to the differences between the two years caused by frost damage. Finally, the chlorophyll content as well as content of soluble sugars showed the best correlation to yield under drought stress conditions. All data will be included in genome wide association studies conducted at the University of Göttingen.
Section overview
Subjects
- Plant Breeding
- Vegetable Gardening
- Climate Change
Funding programme
Excutive institution
Federal Research Centre for Cultivated Plants – Julius Kühn-Institut (JKI)
