Variation of the genomic proportion of the recurrent parent in BC 1 and its relation to yield performance in sorghum (Sorghum bicolor) breeding for low-input conditions
Institute of Vegetable and Fruit Science, University of Hannover, Herrenhäuser Straße 2, D-30419 Hannover, Germany; Agricultural Research Council (ARC), Grain Crops Institute (GCI), Private Bag X1251, Potchefstroom 2520, South Africa; Department of Plant Production, University of the North, Private Bag X1106, Sovenga 0727, South Africa; Northern Province Department of Agriculture, Land and Environment (NPDALE), Potgietersrus, South Africa; Institute of Agronomy and Plant Breeding I (IPZ), Justus-Liebig-University, Heinrich-Buff-Ring 26-32, 35392 Giessen, Germany; Institute of Epidemiology and Resistance Resources, Federal Center for Breeding Research on Cultivated Plants, Theodor-Roemer-Weg 4, D-06449 Aschersleben, Germany
In order to define the variation of the genomic proportion of the recurrent parent [G(RP)] and its relation to yield, G(RP) of individual BC1 plants of two sorghum populations composed of a high-yielding cultivar as recurrent parent (RP) and a donor with superior drought resistance or grain quality, respectively, was estimated using AFLPs and SSRs. G(RP) in BC1 ranged from 0.53 to 0.95 and averaged to 0.76 in the population (NP4453 x 'SV-2') x 'SV-2'. G(RP) varied between 0.60 and 0.86 and averaged to 0.74 in the BC1 of (ICV-219 x 'SV-2') x 'SV-2'. Results show that plants with a G(RP) equivalent to BC2 (0.875) or BC3 (0.938), respectively, can be selected from BC1. Yield performance of BC1S1 families was tested in field trials carried out in South Africa. The correlation between yield and G(RP) in BC1 was low. Selection according to G(RP) did not result in an effective preselection for yield. © 2006 The Authors.