Agronomic performance of anther-derived doubled haploid and single seed descent lines in crosses between primary and secondary winter triticale

摘要

Octoploid (8x) and hexaploid (6x) primary triticales (xTriticosecale Wittm.) can be used as crossing parents with secondary 6x triticales to enlarge the genetic basis of a breeding programme or introgress traits. Doubled haploid (DH) production permits to develop homozygous lines more rapidly from a segregating generation than other breeding methods such as single seed descent (SSD). Both anther-derived DH and SSD lines were produced from reciprocal cross-combinations between 8x and 6x primary and 6x secondary triticales. Field experiments of DH and SSD lines were conducted in three environments as two-replicate lattices to measure seven agronomic traits. A tendency for higher grain yield, taller plants and a higher 1000-kernel weight of SSD lines compared with DH lines was found. Significant genetic variation for all traits in both breeding methods was revealed, indicating their suitability to select superior genotypes. Hexaploid and even more so 8x primary triticales can profitably be included as crossing parents in a commercial breeding programme. In such crosses, the primary triticales should be used as the male parents if followed by DH method.