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配制了(普通小麦×中间偃麦草)杂交组合15个。在回交结实的 F_(1)植株 PMC中均观察到染色体完全呈单价体构型。单株染色体分析表明,获得的32个 BC_1单株基本上包括了2n=42至2n=63的各种过渡类型,其中2n=63植株占37.5%。而且81.25%的植株在2n=59～63的范围内。显然,F_1产生的可育雌配子主要是染色体不减数和减少较少的类型。这种类型的 BC_1代植株 PMC MI 二价体值均接近21,育性也明显高于染色体数较少的 BC_1植株。这与(普通小麦×长穗偃麦草10x)杂种相应世代的表现完全不同。因此,(普通小麦×中间偃麦。)杂种后代类型形成途径不能按照 F_1染色体组随机组合的方式推断,育种过程中各种后代类型的出现主要是由 F_1不减数及减少较少的配子所衍生的。
Fifteen hybrid combinations (common wheat × Thinopyrum intermedium) were prepared. Chromosomes were completely monovalent in the PMCs of backflooded F_ (1) plants. Chromosome analysis showed that the 32 BC 1 plants obtained basically all kinds of transition from 2n = 42 to 2n = 63, of which 2n = 63 plants accounted for 37.5%. And 81.25% of the plants in the range of 2n = 59 ~ 63. Obviously, the fertile female gametes produced by F_1 are mainly the types of nonreduction and reduction of chromosomes. The BC1 plants of this type all had similar PMC MI bivalence values of 21 and fertility significantly higher than those of BC1 plants with fewer chromosomes. This is completely different from that of the corresponding generation (T. vulgaris × 10x) hybrids. Therefore, the formation of the hybrid progenies (T. tritici × M. intermedium) can not be deduced from the random combinations of the F_1 chromosomes. The occurrence of various progeny types in the breeding process mainly consists of gametes with no reduction in F_1 and less reduction Derived.