Development of lodging-resistant and climate-smart rye – a contribution to a sustainable cereal production in marginal environments

European cereal production experiences an ongoing intensification on wheat and barley at the expense of minor cereals including einkorn, emmer, oat, rye and spelt. This specialisation leads to continuous loss in agricultural biodiversity and marginalisation of traditional land management systems. A diversification of cropping systems by minor cereals offer benefits with respect to agronomic management, grain processing, nutritional quality, health promotion and numerous ecosystem services. Enhanced plant breeding efforts are of strategic importance to improve the competitiveness of minor cereals in European agriculture. Rye is the only cross-pollinated small-grain cereal, which results in a unique complexity concerning the genetic improvement of rye and underlines the need for rye-specific research concepts. Plant architectural traits are important breeding targets to improve crops yield potential and food security. The overall goal of RYE-SUS is to develop, test and model gibberellin-sensitive semi-dwarf rye genotypes with optimized harvest index, improved lodging resistance, high yield potential and drought tolerance as well as minimised risk of ergot infestation for a sustainable intensification also in marginal production environments. To improve rye competitiveness in European agriculture, RYE-SUS aims to i) make use of hybrid breeding as a cutting edge technology of crop improvement and genome-based precision breeding to increase target-specific selection efficiency and accelerate breeding processes in rye, ii) develop new genotypes leading to improved lodging and drought tolerance, iii) proof the practical potential of genotypes with a novel plant architecture in target environments, which challenge rye cultivation by potentially growth-limiting factors such as drought, frost, or nutrient deficiencies, iv) minimize the risk of extremely toxic ergot alkaloids in the harvest, v) exploit natural genetic diversity in adaptive traits and develop new molecular technologies which support niche range expansion of highly productive rye hybrids in cold climate ecosystems, and vi) develop and exploit a crop model to simulate the growth and development of rye under potentially growth-limiting factors as a tool to support novel integrated pest and crop management methods and practices.