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Rym16Hb的定位，Rym16Hb是从球茎大麦导入的第二个土壤传播病毒抗性基因。

Mapping of Rym16Hb, the second soil-borne virus-resistance gene introgressed from Hordeum bulbosum.

作者信息

Ruge-Wehling B, Linz A, Habekuss A, Wehling P

机构信息

Federal Centre for Breeding Research on Cultivated Plants (BAZ), Institute of Agricultural Crops, Rudolf-Schick-Platz 3a, 18190 Gross Lüsewitz, Germany.

出版信息

Theor Appl Genet. 2006 Sep;113(5):867-73. doi: 10.1007/s00122-006-0345-8. Epub 2006 Jul 13.

DOI:10.1007/s00122-006-0345-8
PMID:16838136
Abstract

Rym16(Hb), a gene conferring resistance to soil-borne viruses, was introgressed from Hordeum bulbosum to barley chromosome 2HL. Mechanical inoculation with BaMMV and field tests on a plot contaminated with different viruses demonstrated that Rym16(Hb) is effective against all European viruses of the soil-borne virus complex (BaMMV, BaYMV-1, -2). Genetic analysis revealed a dominant inheritance of the resistance controlled by Rym16(Hb). Using 2HL anchor markers, the size of the introgression was estimated to be about 30 M. In its proximal part, the introgression was characterized by a rearrangement of markers Xbcd266, ABC153 and ABC252, accompanied with pronounced linkage drag by factor 4 in segregating mapping populations. The introgression was found to be associated with a recessive lethality factor, l(Hb), which was closely linked to the markers mentioned above. Recombination occurring within the introgressed H. bulbosum segment allowed us to separate l(Hb) from Rym16(Hb) and to reduce the size of the introgression to 23 cM or less.

摘要

Rym16(Hb)是一个赋予对土传病毒抗性的基因，它从球茎大麦导入到大麦2HL染色体上。用大麦花叶病毒（BaMMV）进行机械接种以及在受不同病毒污染的地块上进行田间试验表明，Rym16(Hb)对土传病毒复合体的所有欧洲病毒（BaMMV、BaYMV - 1、- 2）均有效。遗传分析显示，由Rym16(Hb)控制的抗性呈显性遗传。利用2HL锚定标记，估计导入片段的大小约为30兆。在其近端部分，导入片段的特征是标记Xbcd266、ABC153和ABC252发生重排，在分离的作图群体中伴随着4倍的明显连锁累赘。发现该导入片段与一个隐性致死因子l(Hb)相关，该因子与上述标记紧密连锁。在导入的球茎大麦片段内发生的重组使我们能够将l(Hb)与Rym16(Hb)分离，并将导入片段的大小减小到23厘摩或更小。

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