LupiBreed – Improving yield potential, yield stability and seed quality of lupins as protein plants
Blue lupins have, due to their slow youth development, only a low competitive ability against weeds. Lupin varieties with higher competitive ability could help to facilitate weed control. We want to develop a test system that detects and evaluates the weed suppressive effect of blue lupins and helps to identify competitive strong breeding lines.
In Spring 2015, the project "LupiBreed" started with the aim of improving the productivity of the blue and yellow lupin in terms of grain yield, yield security and stability as well as the quality of their nutritional components. Furthermore, the narrow genetic base of these crops is expanded by the inclusion of plant genetic resources to increase their potential for further breeding processing. "LupiBreed" is a joint project of Saatzucht Steinach, the Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), the Thünen Institute of Organic Farming and the Julius Kühn Institute (project coordination).
In another work package, at the Thünen Institute of Organic Farming in Trenthorst we are researching preventative options for weed control and for optimizing mixed cropping. For this we record and evaluate the competitive ability of varieties and new breeding lines against weeds and mixed partners in intercrops. The aim of our investigation is to select particular characteristics such as a good plant development, leaf morphology and growth type during the breeding process more intensively in order to strengthen the preventive plant protection and the cost of weed control can be reduced.
In triannual plot trials we examine the competitive ability of lupins by seeding them with different partners in different seed rates. Hereby different competition situations are created, so that we can derive both the weed-suppressing effect as well as the suitability for mixed cropping.
In the first project year 2015, we cultivated the two varieties of blue lupine, Boruta (derminated type) and Boregine (branched type), in a plot trial at the site Trenthorst in a three-factorial block design with three field repetitions. As partner or artificial weeds, the monocotyledonous species wheat and oats, and the dicotyledonous species Camelina and a mixture with "artificial weeds" consisting of equal parts of rape, phacelia and buckwheat were used. In addition, we sowed the four partners in four seed densities to create as many different competitive situations as possible. As control, pure stands of the two blue lupin varieties, which were kept free of weeds, were cultivated, so that a competition against weeds was excluded.
In the second and third experimental year we will test the most promising variants and seed densities of the partners, resp. “artificial weeds”, in the test system for eight selected pre-breeding lines, while the two reference varieties will be tested further.
We sample the trial plots at different growth stages (shoot development, flowering, harvest) of the blue lupines. So we harvest the aboveground biomass, which are quantified separately for lupins, partners and weeds by square meter sections. In addition, we carry out an expert assessment of the plant development for coverage and plant height as well as measurements for Photosynthetically Active Radiation (PAR).
In the first project year we successfully established all partners in the respective seed densities. Thereby we succeeded in creating different competitive situations for the cultivated crop lupin.
False flax affected the development of lupins the most. It showed the lowest biomass production in these variants. In comparison with the partners, the variants with false flax grew best and concurrently weeds occurring naturally at the site the worst. The species mixture of oil seed rape, phacelia and buckwheat, however, led to the lowest biomass production; the biomass production of lupins in these variants was only slightly affected. Comparing the two cultivated lupin varieties Boruta showed a better weed suppressive effect.
2.2015 - 9.2018
Project funding number: 2814EPS007
Project status: ongoing