十倍体长穗偃麦草和六倍体中间偃麦草均含有一些基因促使部分同源的染色体之间发生配对，这些基因分布于不同的染色体组中，并具很强的传递力。小麦与长穗偃麦草杂种回交后代的部分植株在减数分裂后期出现多条染色体同时断裂现象，使不同染色体通过断口联结形成新的易位成为可能。上述二因素可能是造成小麦和偃麦草基因重组的主要原因之一。 Both the ten-year-old and the six-year-old Thinopyrum intermedium contain some genes that cause pairing between homologous chromosomes. These genes are distributed in different chromosomes and have strong transmission. Some plants of backcrossing hybrids between wheat and long-tailed Echinochloa crus-galli appear multiple chromosomes to break simultaneously at the late stage of meiosis, which makes it possible for different chromosomes to form new translocations through fracture junctions. The above two factors may be one of the main reasons for the recombination of wheat and wheat genome.