Genome. 1995 Apr;38(2):385-94. doi: 10.1139/g95-050.
Zhong 5 is a partial amphiploid (2n = 56) between Triticum aestivum (2n = 42) and Thinopyrum intermedium (2n = 42) carrying all the chromosomes of wheat and seven pairs of chromosomes from Th. intermedium. Following further backcrossing to wheat, six independent stable 2n = 44 lines were obtained representing 4 disomic chromosome addition lines. One chromosome confers barley yellow dwarf virus (BYDV) resistance, whereas two other chromosomes carry leaf and stem rust resistance; one of the latter also confers stripe rust resistance. Using RFLP and isozyme markers we have shown that the extra chromosome in the Zhong 5-derived BYDV resistant disomic addition lines (Z1, Z2, or Z6) belongs to the homoeologous group 2. It therefore carries a different locus to the BYDV resistant group 7 addition, L1, described previously. The leaf, stem, and stripe rust resistant line (Z4) carries an added group 7 chromosome. The line Z3 has neither BYDV nor rust resistance, is not a group 2 or group 7 addition, and is probably a group 1 addition. The line Z5 is leaf and stem rust resistant, is not stripe rust resistant, and its homoeology remains unknown.
中 5 是普通小麦（2n = 42）与中间偃麦草（2n = 42）的部分双二倍体（2n = 56），携带小麦的全部染色体和中间偃麦草的 7 对染色体。经过与小麦的进一步回交，获得了 6 个独立稳定的 2n = 44 系，代表 4 个二体附加系。一条染色体赋予大麦黄花叶病毒（BYDV）抗性，而另外两条染色体携带叶锈病和秆锈病抗性；其中一条后者也赋予条锈病抗性。利用 RFLP 和同工酶标记，我们表明，在源于中 5 的 BYDV 抗性二体附加系（Z1、Z2 或 Z6）中，额外的染色体属于同源群 2。因此，它携带不同于先前描述的 BYDV 抗性第 7 附加系 L1 的不同基因座。叶锈病、秆锈病和条锈病抗性系（Z4）携带一个附加的第 7 组染色体。系 Z3 既没有 BYDV 也没有锈病抗性，既不是第 2 组也不是第 7 组附加，可能是第 1 组附加。系 Z5 具有叶锈病和秆锈病抗性，不具有条锈病抗性，其同源性尚不清楚。
