采用AFLP技术和方法,对携带Lr34的小麦近等基因系、染色体代换系进行了DNA多态性分析。共筛选了78对EcoRI/MseI引物(上海生工),筛选获得一对特异性引物(E03:5'-GACTGCGTACCAATTCAAT-3’和M01:5'-GATGAGTCCTGAGTAACAT-3’),可在抗病亲本中扩增出两条大小分别为240bp和300bp的DNA多态性片段,在感病亲本中未能扩增出同等大小的DNA片段。通过对一条多态性片段(240bp)进行分离克隆和序列测定,表明这一与抗病基因可能有关的DNA多态性片段大小为237bp。根据此序列设计引物,可进一步对抗病亲本进行回检及开展与抗病基因的连锁分析。
根据与持久抗秆锈基因Sr31有关的DNA多态性片段序列,利用Primer 5.0软件共设计出7对特异性引物。通过利用Sr31的小麦近等基因系及其它抗/感材料进行回检筛选,获得Sr31的特异性引物(BR_(41):5’cac ccc ctt ggt agc aca 3’和BR_(12):5’agc cag tat cct cca cct cct3’),可定性扩增D...
【英文摘要】
The genes for leaf rust resistance Lr34 and for stem rust resistance Sr31 are all the most important resistance genes against rust fungi in wheat in the world. It is important for utilizing Z,r34 and Sr3l rapidly and effectively in wheat breeding program to develop the molecular markers linked to resistant genes and establish the technical system of molecular marker assistant breeding.
DNA polymorphism of the near isogenic lines and chromosome substitution lines with/without Lr34 were analyzed us...