zur Hauptseite

Institute of Bio- and Geosciences

Navigation und Service

JPSS Jülich Plant Science Seminar Series:
Peter J Gregory East Malling Research and University of Reading UK

Getting to the root of dwarfing control in apple rootstocks and the role of emmer introgression in wheat

23.07.2015 13:00 Uhr
23.07.2015 14:00 Uhr
Forschungszentrum Jülich, Gebäude 06.2 IBG-2, Seminarraum 406, 2.Stock

We are engaged in field and controlled environment studies to understand both the effects of rootstocks and their management on the growth, architecture and fruiting of apple trees and the regulation of root growth of wheat deep in the soil profile.

Recent research at East Malling Research aims to understand the genetic basis for the dwarfing propensities of some rootstocks and the physiological and architectural responses of root systems to scions. Previous studies have focused upon a secondary, conferred (and more subjective) trait i.e. the amount of vigour control exerted by the rootstock on a grafted scion but this trait needs to be measured over many years and is subject to the influence of scion genotype, environmental conditions, crop load and biotic and abiotic stresses. In our study, we have measured instead a ‘primary’ rootstock trait in the ungrafted rootstock, termed ‘root bark percentage’, (Rb), and have identified three QTL (Rb1, Rb2 and Rb3). We have determined that these QTL are significantly correlated to rootstock-induced dwarfing of a grafted scion by examining a grafted subset of our rootstock mapping population.

Previous work at the University of Reading found that the UK winter wheat cultivar Shamrock had significantly greater root length densities below 40 cm compared to other elite UK wheat cultivars. This cultivar has had recent introgression from wild emmer (Triticum dicoccoides) in its development, but the extent to which this contributes to the cultivar’s greater rooting at depth is unknown. The diversity of root architectural traits, specifically rooting at depth, is being studied within a doubled haploid population in the field and in controlled environments to identify associated quantitative trait loci (QTL). I shall present our most recent results suggesting that this introgression and the deeper rooting are related.

Contact: Tobias Wojciechowski