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1975年Bardclay首先报道用普通小麦(Triticum aestivum)和球茎大麦(Hordeum bulbosum)杂交后,由于在杂合子初期发育过程中父本染色体迅速完全消失,可以获得小麦单倍体。1986年以来,不同作者先后又发表了由普通小麦分别和玉米(Zea mays)、高粱(Sorghum bicdor)、珍珠粟(Pennisetum americanum)、类玉米(Zea mays ssp.mexicana)等杂交获得小麦单倍体的报道。这些杂交打破了以往小麦只能和一些小麦族(Triticeae)族内属,如黑麦属(Secale)、山羊草属(Aegilops)、偃麦草属(Elytrigia)、披碱草属(Elymus)、大麦属(Hordcum)及簇毛麦属(Haynaldia)杂交的局限,使分类距离相当远的属间杂交成为可能。但是,由这些杂交均不能获得保留外源染色体的杂种,对于通过远缘杂交将外源属的染色体或染色体片段导入小麦,用于小麦的改良和种质创新是极不利的。
In 1975, Bardclay first reported that the wheat haploid could be obtained after the crossbreeding of Triticum aestivum and Hordeum bulbosum, due to the rapid and complete disappearance of the paternal chromosome during the initial development of heterozygotes. Since 1986, different authors have successively published wheat haploid lines obtained by crossing common wheat with Zea mays, Sorghum bicdor, Pennisetum americanum, Zea mays ssp. Mexicana, Report. These crosses broke the previous wheat that could only be colonized with some members of the Triticeae family such as Secale, Aegilops, Elytrigia, Elymus, The limitations of crossing between Hordcum and Haynaldia make it possible to classify crosses fairly distant from each other. However, none of the hybrids that retain exogenous chromosomes can be obtained by these crosses, and the introduction of exogenous chromosomes or chromosome fragments into wheat by distant crossing is extremely disadvantageous for wheat improvement and germplasm innovation.