Studies on the interspecific hybrids in genus Fagopyrum

普通荞麦（Fagopyrum esculentum）是荞麦科荞麦属的一种。荞麦具有典型的二态自交不亲和，被认为是造成荞麦种子产量低的重要因素。为了成功地进行荞麦育种，进行了种间杂交，将近缘种的有价值基因引入到荞麦品种中。这些基因的期望性状包括高种子产量、对环境胁迫的耐受性和对病虫害的抗性。迄今为止，已知的野生种较多，其中大部分也表现出二态自交不亲和，如同质热带蓼。为了更好地利用亲缘种选育荞麦品种，对其杂交亲和性的研究可提供有价值的信息。为了获得荞麦属的种间杂交种，于1994年将普通荞麦与中国南方引种的同源荞麦进行了常规杂交。1995年和1996年分别对F_1和F_2杂交种的性状进行了研究。结果可以总结为：1。F_1代花的形态型为同态，而F_2代花的形态型为同型和异型。杂交种的叶片形状表现为双亲的中间形态。F_2代大量杂交种出现自交受精，属同态型。研究表明，该杂交种可作为荞麦的优良选育材料。

Common buckwheat, Fagopyrum esculentum, is one of species within the genus Fagopyrum belongs to the family of Polygonaceae. F.esculentum shows typical dimorphic self-incompatibility has regarded as an important factor of low seed productivity of buckwheat. In order to successfully carry out breeding in buckwheat, interspecific hybridization has been conducted, introducing valuable genes from relative species to buckwheat varieties. The desired traits of these genes included high seed productivity, tolerance to environmental stress, and resistance to pests and diseases. Up to now many relative wild species of Pagopyrum are known, and most of which also show dimorphic self-incompatibility such as F.homotropicum. With a view to utilizing the relative species in breeding of buckwheat varieties, investigation of the cross-compatibility can provide valuable information.To obtain the interspecific hybrids within genus Fagopyrum, conventional crossing between common buckwheat and F.homotropicum, introduced from southern China, were carried out in 1994. In 1995 and 1996, Characteristics of F_1 and F_2 hybrids were investigated. The results may be summarized as follows ;1.Morphic type of flower in F_1 showed the homomorphic, but in F_2 generation was segregated homo and heteromorphic.2.The shape of leaves of hybrids showed intermediate of both parents.3.A large number of hybrids in F_2 generation appeared self-fertilization with homomorphic type.4.It is concerned that the hybrids are used as suitable breeding materials in buckwheat.