Yasumoto Akiko A, Yahara Tetsukazu
Department of Biology, Faculty of Sciences, Kyushu University, 6-10-1, Hakozaki, Higashi-ku, Fukuoka, 812-8581, Japan.
J Plant Res. 2008 May;121(3):287-91. doi: 10.1007/s10265-008-0152-1. Epub 2008 Feb 27.
Reproductive failure of backcross could play important roles in determining the evolutionary outcome of hybridization. However, such studies have been somewhat fewer than those of the F1-producing cross and F1 x F1 cross. We conducted hand-pollination backcross experiments using Hemerocallis fulva, H. citrina, and their F1 hybrids. Seed set per flower of the backcrosses reduced to about 50% of the control cross, irrespective of ovule parent species. This symmetrical seed set reduction on the backcross might be caused by the death of backcross embryo as a result of Dobzhansky-Muller incompatibility by recessive alleles.
回交的生殖失败在决定杂交的进化结果中可能起重要作用。然而，此类研究比产生F1的杂交和F1×F1杂交的研究要少一些。我们利用萱草、黄花菜及其F1杂种进行了人工授粉回交实验。无论胚珠亲本物种如何，回交后代每朵花的结实率降低到对照杂交的约50%。回交后代结实率的这种对称降低可能是由于隐性等位基因导致的多布赞斯基-穆勒不相容性致使回交胚死亡所致。
